Frequently Asked Questions

1. Sales Information (3)

Per our license agreement the EnergyPro software is non-refundable once you have installed it.  For this reason we offer a free demonstration version of the software so you can “try before you buy”.

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Go to the Help menu item in EnergyPro and click on Activated Modules for a list of modules you currently have activated on that computer.  For questions, contact sales@energysoft.com

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EnergyPro runs under a Windows based operating system, in order to use EnergyPro on an Apple computer you will need to use Boot Camp or any other type of software that allows for a parallel installation of Windows.  Boot Camp allows you to install Windows alongside OS X on your Mac. Only one operating system can be running at a time, so you’ll have to to switch between OS X and Windows.

Find more info by clicking here

http://www.macworld.com/article/1164817/the_best_way_to_run_windows_on_your_mac.html

 

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2. Installation (16)

This error is caused by one of two things:

1. You installed EnergyPro as the Admin (or some other) account, but are now logging on as a particular user.  These files are installed into the My Documents folder belonging to the user who installed the software and will not be accessible to other users due to Windows security protocols.

2. When you installed the software, the account you installed under did not have sufficient security privileges to allow the software to create these files under the My Documents\EnergyPro 7\Libraries folder.  You need to allow for that access to the folder.

Either one will require a reinstall of the software so these files can be created.

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Using Windows Explorer, navigate to the folder My Documents\EnergyPro 6 and copy the file named “EnergyProContacts.mdb” to your new folder My Documents\EnergyPro 7

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One of two things is causing this problem.  The first possibility is that EnergyPro is unable to save the “license.lic” file onto your computer.  That is the file that activates the software and is stored under the folder Program Data\EnergySoft\EnergyProX”.  Either you do not have the appropriate security rights on the computer to save the file, or you have some security software active that is blocking the saving of that file.  You should deactivate the software and/or modify your security rights to allow for that file to be saved.

The second possibility is that you have security software that is sweeping your computer clean, thus while EnergyPro is able to save the file, the software is then removing that file, assuming it is placed there as a virus.  This software should not remove the file to prevent this.

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To remove a license key from a computer, go to Help > Software Activation and click on Uninstall License.

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Digital signatures can be added to your reports by placing a .jpg file of your signature in the forms folder.  The forms folder is located under: C:\Program Files(x86)\EnergySoft Software\EnergyPro 7\Forms.  The file you save in the forms folder needs to have the EXACT name: signature.jpg.  Not signature.jpg.jpg.  The JPEG needs to be just large enough to encompass the signature.  If you have an 8.5″ x 11″ page with a small signature in the middle, the signature will not show up.

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A company logo to go on the cover page can be added to your reports by placing a file with your logo in the forms folder.  The forms folder is located at: C:\Program Files (x86)\EnergySoft Software\EnergyPro 7\Forms.  The file you save in the forms folder needs to have the EXACT name logo.jpg  Not logo.bmp or logo.bmp.jpg.

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Stamps can be added to your reports by having a file of your stamp in the forms folder.  The forms folder is located: C:\Program Files (x86)\EnergySoft Software\EnergyPro 7\Forms.  The file you save in the forms folder needs to have the EXACT name stamp.jpg. Not stamp.jpg.jpg

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When EnergyPro is uninstalled via Control Panel, none of the BLD or Library files you have created will be impacted.  They will remain exactly where you left them.  You can check where you files are being saved by creating a file in EnergyPro and then clicking ‘Save As’.  In the dialog that appears will be be a ‘Save in:’ box.  This is where your current files are being saved.  You can change this by selecting a different location if you wish.

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In EnergyPro, go to the Tools item on the Menu bar and select the User Information selection. Once this information has been entered it will be kept permanently on your computer for that version of the software.

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When opening EnergyPro for the first time the software will prompt you to install your EnergyPro License key ( You can also find the software activation box by going into the “help” tab and clicking on “Software Activation”).

An email containing your license key and company name was provided to you at the time of purchase. It is important to save this original email as it contains your license key which is your proof of purchase.

It is REQUIRED that you COPY and PASTE the company name and the license key from the original email into the activation box in EnergyPro. Once done click “Install License”.

The License status should now prompt you that the license is installed, you may now click the “OK” button and begin using EnergyPro.

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The first thing you need to do is follow the instructions in the email that was sent when you purchased the software regarding copying and pasting the company name and license key into the software activation window of EnergyPro.  Once you have done this the license activation window should look like this, with your company name and license key:

License Activation Box

When you hit the ‘Install License’ key it will come up with a message window that looks like:

Unable to Connect To EnergySoft Server

Click ‘Yes’

You will then see a screen like this:

Export License File

Click save and remember where it is saved to (in this case it is saved to My documents).

You then need to send that license.lic file in an email to sales@energysoft.com for them to authenticate it and send it back.

Once you have received the email with the authenticated license.lic file, you will need to save the file somewhere on your computer to be used later.  You will not be able to open the license.lic file by double clicking on it.

Go into EnergyPro and open the software activation window by going to Help / software activation, it will look like:

Blank Software Activation Box

Click on the ‘Import’ button and in the ‘Look in’ section, go to where ever you have saved the AUTHENTICATED license.lic file that energysoft sent back to you.  It should look like:

Open License File

Click ‘Open’

You should see this screen:

License Installed Screen

If you see ‘license installed’ then you have successfully installed the license.  Go ahead and use the software.

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This issue is related to your Windows scale and layout settings.  To fix this, do the following:

Right mouse click on the desktop and select Display Settings.

Set “Scale and layout” to 100%

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EnergyPro runs under a Windows based operating system, in order to use EnergyPro on an Apple computer you will need to use Boot Camp or any other type of software that allows for a parallel installation of Windows.  Boot Camp allows you to install Windows alongside OS X on your Mac. Only one operating system can be running at a time, so you’ll have to to switch between OS X and Windows.

Find more info by clicking here

http://www.macworld.com/article/1164817/the_best_way_to_run_windows_on_your_mac.html

 

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Begin by removing the license key from the old computer.  This is done via Help | Software Activation.  Select the option to “Uninstall License”.  You can now uninstall EnergyPro from that computer via Windows Control Panel.

Once this is done, install EnergyPro on the new computer, select Help | Software Activation and enter the original activation information that sales sent via e-mail when you purchased the software.  If you do not have the original e-mail, contact sales@energysoft.com to have the information resent.

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In the headline of the email with the activation key it should indicate the version of EnergyPro the activation key applies to.  You need to make sure you have downloaded the appropriate version of EnergyPro for your activation key. The error message occurs either when the company Name or License key is entered incorrectly, or that you have downloaded the wrong version for your license key.

 

If you do have the correct version of EnergyPro downloaded then make sure that when you copy the license key/company name that there are no spaces at the beginning or end of both the Company Name and the Activation key when you paste it into the activation screen. It is vital that you COPY and PASTE both the license key and company name directly from the e-mail, failure to do so will result in the error message prompt.

 

If you still are experiencing difficulties after trying this please contact sales@energysoft.com for further assistance

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3. General (19)

At the Zone level of the Building tree, under the selection for Building Story, you have added a Multiplier (2, 3 etc) to this entry which multiplies the entire Zone and everything in it.

To fix this, click on the Zone in the Building Tree, click the entry for Story and change the Floor Multiplier to 1.

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Navigate to the DHW/Boiler library and create a new Water Heater.  Set the Water Heater Type to “Heat Pump”.  Enter the Volume, Energy Factor and Input Rate from the manufacturer’s specifications.  Note that sometimes the Energy Factor may be listed as the COP in the data.

Currently you cannot model a heat pump water heater that serves nonresidential occupancies since the CEC CBECC engine does not support that feature.

For residential projects (single family, multi-family, high-rise residential, hotel/motel), if a heat pump is rated by the Northwest Energy Efficiency Alliance (NEEA), you may check the “NEEA Rated”  box at the bottom of the editor and select a specific type of water heater.

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As of EnergyPro v6, the energy budget for your building is set internally by the CEC supplied compliance engine (CBECC).  As such, we do not have control or access to that feature so any questions on the energy budget should be directed to the CEC hotline at (800) 772-3300.  The CEC publishes a document called the Alternative Calculation Method (ACM) manual, you can Google this and take a look at this document.  Also, some of the training classes on the code will give you insight into that, and in the case of the Residential software, Package A in the Standards would be your starting point.  For Nonresidential lighting and envelope, the Prescriptive section of the Standards would also be a good starting point, but the HVAC is detailed in the ACM manual.  Look in the EnergyPro Help for some information on those tables also.

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You can edit the specs on an existing system or assembly from the libraries in EnergyPro or you can use the “Add new” button to create your own.

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1. The EnergyPro libraries come pre-populated with most of the common utility rates in California.

2. Select an electric/gas utility rate at the Building level of the Tree, Utility tab.  Note when selecting one you can use the green Import button to pick from a list.

3. Go to Calculations and check the box for the particular calculations you wish to run.

4. Calculate.

5. In the Report Wizard, Select the report labeled “ECON-1”, and proceed to finish.

6. Click the Print Preview button.

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Under Help | EnergyPro News, we have a news feed that will alert you automatically to any new updates published for the software.

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To create CSV Files, you need to go to the calculations button on the bottom left, and then go into whichever calculation you are working on (NR Title 24 Performance, NR ASHRAE 90.1, etc.). Deselect ‘Delete Temporary Files after Simulation Complete’ and then select ‘Generate CSV Output File Containing Detailed Results’ as shown in the screenshot below.   The CSV reports will be found in the Results folder located: My Documents/ EnergyPro 7/ Results. See screenshot below.

CSV File

 

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The best way to create your own utility rate is to edit one of the utility rates that are already in the list.  You will have to get the information from the utility company on their actual costs.

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At the top level of the Building Tree, start by selecting a location that is in the correct Climate Zone from the selections listed.  This ensures that your report will use the correct code requirements for compliance.  You can then check the box for “User Defined” location and modify the design conditions based upon data that you may have, ensuring that your load calculations are done with the correct data.

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In the Domestic Hot Water tabs at the Plant level of the tree you can enter the percent of Domestic Hot Water provided by a solar domestic hot water system (Net Solar Fraction).  The NSF will need to come from the solar hot water provider or an external calculation.

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Click on the red “X” to the left of the entry.  Select Yes when asked to confirm the deletion.  Your input will show Undefined.   (Note:  this operation will not delete the item from the library.)

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EnergyPro contains the complete list of CEC certified equipment directories.  To select an item from this list, click the new option at the Central System Library editor.  Once you are in the edit menu for the system, select the green import button at the top of the dialog.  By clicking this button EnergyPro will allow you to select a system from the CEC equipment listings and add it to your working library.

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When a new window is created in EnergyPro it is created specific to your file, meaning that the item will only appear in the file being modified.  Once inside the Fenestration Library select the window that you have customized and click on the Export button.  The program will ask you to select a destination, by selecting the Default Library and mouse clicking the OK option, the window you have created will now be added to the Default Library.  Any new projects that you start will automatically include the contents of the Default Library.  However, the window you just created will not appear in an other projects that have already been created.

This window can be exported to an older project by exporting from the default library to the older project file. The default libraries can be accessed under Tools | Default Libraries.

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You will have to input an interior window as an interior door in an interior surface (wall).

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A user may combine systems or any input for that matter that are identical and whose requirements do not mandate that detailed inputs be used.  When combining inputs, be sure to keep track of the multipliers and that your floor levels are being reported correctly.  The criteria in this case would be that the systems serve zones that are thermally identical.  An example of this would be a core zone of a building.  Five different orientations would not meet this criteria.  Consult the CEC’s Residential and Nonresidential Manual for information on the depth of detailed information that may be required for the situation in question.

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EnergyPro requires that you input your heat pump heating capacity at the AHRI rating condition of 47 degrees F dry-bulb.  Typically, design conditions at your actual site are much colder, so EnergyPro will de-rate the heat pump capacity, based upon this condition.

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EnergyPro requires that you input your air conditioner cooling capacity at the AHRI rating condition of 95 degrees F dry-bulb outside air, 67 degrees F wet-bulb entering air.  Typically, design conditions for your building will be different.  Changes in outside design conditions and indoor entering air conditions will result in a different overall capacity for your system than the value you specified in the library.

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The latest version of EnergyPro can read any of the older version 5 or version 6 files. See the FAQ on reading version 4 files. Note that in the case of Assemblies, you should read the topic “How do I create an assembly for the new NR T24 Performance calculation?” Given the more sophisticated inputs now being used with the CBECC Com engine, you will need to re-enter any exhaust fans, since those now occur at the Zone level of the tree, and you should review the fan information in the Central System library since those inputs have also changed.

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4. CF-1R Registration (22)

When you register a project with EnergyPro you will be prompted to “Save As” during the registration process. It is up to you to select where you would like to save the .XML file in order to locate it when it is time to upload the file to the appropriate HERS provider to complete the registration process. It is easiest to save to file to your desktop.

* If you cannot remember where you chose to save the .XML file, you will have to go through the registration process again. Credits for re-registrations can be obtained by emailing support@regt24.com

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In cases where the CF-1R requires HERS verification in the field for certain measures, the CF-1R will include the watermark.  This means that the CF-1R data must be registered with a HERS provider, generally CHEERS or CalCERTS.  You will need to establish an account with them and upload the data for your project.  Then, they will issue a registered version of the CF-1R that does not include the watermark.

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If you have registered a project multiple times and would like a credit for the multiple registrations you will need to email support@regt24.com. The plan name and project ID need to match in order to receive a credit.

* Please provide them with your EnergyPro User number and the project name and dates of registration. We will credit your account back accordingly.

 

Please Note: We are unable to provide credits for jobs that use Generic names (Plan 1, Job 1…ect.). Please make sure to use a job number or project name so we can identify the project accordingly.

 

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If you have completed the registration and have not received your PDF reports from the HERS provider with the watermark removed, you will need to contact the support for the HERS provider (not us) and ask them what is causing the watermark to remain.

*Once you upload the file to the HERS provider they take over the registration process and remove the watermark on your reports. EnergyPro does not have the ability to remove the watermark, only HERS providers can do so.

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Attached is a link for directions to register the CF-1R with CalCerts registry.

 

 

CF-1R Registration Directions for CalCerts:

2013EnergyCalculationUploadsForEnergyPro

 

Please note:

Assistance with registration through EnergyPro should be directed to support@regt24.com

 

Assistance with CalCerts website should be directed to tech@CalCerts.com

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The CF-1R shown in EnergyPro is generated by the California Energy Commission online report generator.  The CEC report generator includes the watermark to ensure that projects that require HERS registration do not get submitted.  The determination of the watermark and resulting HERS registration is made by the CEC report engine, not EnergyPro.

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The CF-1R must be registered with CHEERS or CalCERTS.  Once it is registered, they will issue a new CF-1R to you that does not include the watermark.  EnergyPro cannot remove the watermark, only they can.

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The California Energy Commission requires any residential Title 24 projects that are subject to HERS (Home Energy Rating Systems) testing to have the CF-1R registered with an approved HERS provider. If your project has any measures that require testing, the CF-1R must be registered.

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In the 2013 Title 24 Standards, the CEC introduced new mandatory testing requirements related to HVAC system and IAQ fans.  Thus, any ducted systems must have HERS testing, and all IAQ fans, which in turn means the CF-1Rs must be registered.

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Building departments have been instructed by the State to reject any CF-1Rs that are not registered that require HERS verification.

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EnergySoft will charge you $7 to register the CF-1R. This will be subtracted from your account balance automatically.

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EnergySoft has an arrangement with CHEERS such that there will be no additional charge from their side for the CF-1R registration for EnergyPro users.  CalCERTS has decided that they will charge an additional fee on their side for the registration.

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While other software programs do not charge you to register, you will have to pay a fee at the HERS provider website to register those projects so you end up paying either way.  We have just simplified the process, and eliminated the CHEERS provider fee for you.

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1.       The first step is to establish an account with CHEERS or CalCERTS who are the HERS providers our software can register projects with. There is no charge to establish an account with them, and it will allow you to register your CF-1Rs via EnergyPro automatically.     Their websites are www.cheers.org and www.calcerts.com

  1. Once you have a User Name and Password for the account, go into the Tools | Register CF-1R screen in EnergyPro and enter this information.     This will be stored in an encrypted format on your computer to allow instant access to your account.
  2. The next step is to put some money on your account with EnergySoft so that you can automatically do the registrations. We recommend that you put at least enough for 10 projects so you do not have to repeat this process, but you can put any amount from $8 on up.  This is also done from the Tools | Register CF-1R screen.
  3. Now you can open your project and are ready to register your project from the Tools | Register CF-1R screen. Simply click Register CF-1R and your project will be saved to disk as an encrypted XML file.
  4. Now you can upload your XML file to the CHEERS or CalCERTS website.

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The HERS provider website will give you the ability to put your signature on the CF-1R automatically when you setup your account. The Project Designer will still need to place their signature via the HERS provider website. You can get more information on this process at the HERS provider website.

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Once you register a project your account will be debited the registration fee.  We cannot do anything for you at that point.  Please do not call us and request a refund as we have no way to process it, nor is it worth your time or ours to deal with such a small fee.  The software will warn you before it charges your account, so you have the ability to say no at that point.

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Under Tools | CF-1R registrations, there is a tab that will allow you to add funds.  Note that all payment processing is handled by PayPal and we collect no credit card information.  You do not need a PayPal account with this option.  Another option is to send a check to us, and we can add funds to your account, but this will take a few days.

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We encourage you to put extra funds on your account to avoid the hassle of doing it every week or month.     Please e-mail sales@energysoft.com and they will issue you a refund for unused funds.

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Your EnergySoft account is tied to your EnergyPro user number, so your office will have one account with us for the purposes of funds.     You can have as many people in your office that have a licensed version of EnergyPro registratiing projects using that account.     Fees will come out of your account with EnergySoft each time a project is registered.     As far as the HERS provider account, you can choose to have individual accounts for each person in your office on each computer, or a single account. That is your choice, you decide what works best.

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You will need to re-register the project from within EnergyPro.  If you wish a credit for the fee, let support@regt24.com know, they will credit your account.

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Under Tools | CF-1R registrations, there is a tab that will show you all account activity related to your EnergySoft account.

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5. Lowrise Residential Title 24 (41)

When using QII, the CBECC Res engine requires any surfaces (walls, roofs, floors) be selected as different construction assemblies between the existing part of the house or the garage, and the new surfaces.  Thus if you had an R-19 Wall selected for the new part of the home, your Garage and/or Existing part of the home would need to use a different wall, for instance “R-19 Existing” or whatever other unique name you wish to assign.  So you cannot use the exact same assembly names in the library in these cases.

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If the ducts are in an attic with continuous insulation at the roof deck is that considered conditioned space?

Typically, the only time you can consider the ducts as being in conditioned space is if the ducts and air handler are installed underneath the ceiling inside the thermal and air barrier of the envelope. But, when there is roof deck insulation the attic temperature will be much closer to the conditions within the conditioned space. So there is a tremendous benefit from roof deck insulation even if the ducts are not able to be modeled as within conditioned space. (NOTE: Because a radiant barrier requires a 1-1/2″ air space, when roof deck insulation is modeled uncheck the radiant barrier option.) There may be other conditions that meet the definition of indirectly conditioned space.

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In the Construction Assembly editor at the General tab, we provide a pulldown listing all available Roofing Types that the CEC provides.  The CEC would need to expand that list since we have no control over it, so if you do not see your roofing material, you must choose the closest option provided.

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In the Construction Assembly editor, at the Res T24 Performance tab (JA4 tab in older versions), we provide a pulldown listing all Exterior Wall Finishes that the CEC provides.  The CEC would need to expand that list since we have no control over it, so if you do not see your exterior wall material, choose the closest option provided.

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Your security software is blocking the creation of the output files by the CBECC engine.  You need to turn off the security software (or alter the settings if that is possible) so that the files can be created at the end of the simulation run used for reporting.

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Section 150.2 of the code specifically allows small additions that comply Prescriptively to be built with either 2×4 R-15 or 2×6 R-19 walls in cases where that wall is an extension of the existing wall.  You are responsible for demonstrating that the wall is in fact an extension per this section, so we recommend discussing this with the CEC Hotline (800) 772-3300.

Assuming you do meet the exception, starting in version 7.2, we have a checkbox that allows you to indicated that exception at the Wall level of the building tree.  Just be aware, this is a specific exception that only applies to those walls that meet the CEC definition of an extension.  In older versions, you would ignore the warning message.

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Select an Attic roof assembly that has the appropriate level of ceiling insulation in the EnergyPro Assembly library.  For a high performance attic with above deck insulation (option A) edit the input for “Above Deck Insulation” (or if doing Prescriptive compliance “Exterior Insulation”) and put in an R-Value of 6 or 8 (or any other value you wish).  For a high performance attic with below deck insulation (option B) edit the input for “Below Deck Insulation” (or if doing Prescriptive compliance “Interior Insulation”) and put in an R-Value of 13 or 18 (or any other value you wish).

If you do the option B approach, including a radiant barrier is not needed since the insulation will be up against the barrier and will negate the product effectiveness.

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In the assembly editor, you will add Exterior Insulation to your wall assembly.  If the project is Nonresidential Performance, this will be done in the Layers tab by clicking on the Yellow Plus sign to add a layer.  Double click on the layer and select an insulation material from the material list, then move it so it is on the exterior of the wall framing.

If the type of project is Prescriptive, then edit the JA4 tab and simply type in the R-Value of the insulation in the Exterior Insulation entry.  If the project is a Residential Title 24 Performance project, enter the Exterior Insulation on the Res T24 Performance tab.

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At the top level of the Building Tree, in the Residential tab, you can select from a variety of different ventilation cooling systems, including a Whole House Fan.  Once the type of ventilation cooling system is selected, at the System level of the Building Tree, in the Residential tab, input the total CFM for your fan, along with the total wattage.  A whole house fan will only be recognized on a project that has a ventilated attic, and whole house fans will receive no credit in multi-family occupancies per the CEC guidelines.  Note that the CEC maintains a list of approved whole house fans with specifications on their website.

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Select the Assembly Library by clicking on the Libraries in the bottom left corner and selecting the library in the list that appears above.  Now in the right pane, select your roof assembly.  Check the box that indicates the roofing is CRRC-1 certified, then enter your roof reflectance and emittance.  This data will come from your roof properties, typically obtained from the Cool Roof Rating Council website.

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Quality Insulation Installation (QII) is indicated at the top level of the Building Tree, in the Residential tab by checking off the box.  Note that while you will get substantial credit for this feature, it is an option you should verify with the builder.

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EnergyPro includes the ability to calculate an energy design rating (EDR) as required in the CALGreen energy provisions (Title 24, Part 11) for new construction projects.  Note that this rating will not appear for additions and alterations.  Please review page 2 of the CF1R for more information.

The EDR is an alternate way to express the energy performance of a home using a scoring system where 100 represents the performance of a building meeting the envelope requirements of the 2006 International Energy Conservation Code (IECC). A score of zero or less represents the energy performance of a building that combines high levels of energy efficiency and/or renewable generation to “zero out” its TDV energy use.

The EDR is similar to the energy rating index in the 2015 IECC and the 2014 Residential Energy Services Network (RESNET) standards. The lower the score, the more efficient the building.

Buildings complying with the current standards are more efficient than the 2006 IECC, so most newly constructed buildings will have EDR scores below 100 (if an EDR were calculated for an older, inefficient home, the score could go above 100). Buildings with renewable generation such as photovoltaics (PV) can have a negative score.

When performing an EDR calculation, more detail is needed for the PV system(s) including the specifics on the solar system. These inputs only affect the EDR calculation.

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The new EnergyPro 7.1 is “ZNE Ready” meaning it is now configured to allow you to demonstrate a residential building meets the ZNE definition the CEC describes on the CF1R document.  To help you understand this we have provided a new example BLD file designed to run in Version 7.1 that shows an Energy Design Rating (EDR) score less than one.  In addition, the new version provides reporting that will help you and your client understand the energy usage in the home.  Please look at the pages on the sample report, in particular the last two pages.  As an exciting new addition, the software includes a full hourly annual solar system simulation based upon the CECPV/PVWatts simulations.  Look at the example file at the top level of the Building Tree, PV tab.

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For residential projects starting in the 2016 code, the standard water heater is a gas fired tank-less water heater in both the Prescriptive and Performance compliance approaches so using any unit with a tank, and especially an electric water heater will produce a significant penalty.

For commercial projects, the standard water heater under Performance is also a gas water heater.  However, under Prescriptive, you are allowed to use an electric water heater.  Our recommendation is to submit the DHW using the NRCC-PLB-01 form which is available under the NR T24 Prescriptive forms list.

Under the Calculation Options, bottom left button, click and you will see the NR T24 Performance calculations in the list above.  Select this, then on the right unclick DHW from the scope and then rerun and the penalty will be gone.

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Because the duct leakage requirements for these dwelling units are different from multi-family, they must show compliance based upon each dwelling unit as a single family occupancy type.  As a result, a separate input file must be created for each dwelling unit for compliance purposes.

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Our software support services are confined to issues related to running the software, not how to get a building to comply so this is not something you should contact us about.  However, we do realize the 2016 code is much tougher so we have compiled some ideas below for you to consider.

Things to consider.

In addition, getting a better idea of what the Standard Building looks like so you will understand the budget would be a good idea. There are a lot of online resources to help you understand the energy code including trainings offered by the utilities.  Our support forums also will give you the opportunity to see how other users are getting their buildings to comply.  Another resource for information on the code would be the Energy Code Ace website.

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They are just warnings, if you feel your inputs are set properly then it is fine to ignore them.  EnergyPro sets standards for these inputs and gives you a warning if anything is more than 30% outside of that range.

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The CF-1R is required on the plans, we also recommend the Mandatory Measures form.

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The amount of credit for an alteration depends on whether a HERS rater verifies the existing conditions. For example, if you are altering existing metal frame, single-pane windows to vinyl frame, low-e windows, if you do not check “HERS Verification” at the top level of the Building Tree, Residential Tab, the software will not prompt you to input the Existing Conditions. You will only input the efficiency of the new windows and your credit is based on the difference between the new window U-factor/SHGC and 0.40/0.35 (values from Table 150.2-B of the Standards). If you check “HERS Verification” and enter the existing conditions of 1.28 U-factor/0.80 SHGC, the credit you receive is based on the difference between these values and the U-factor/SHGC of the new windows.

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You can let this default and it will be modeled automatically for you, or you can input the IAQ fan at the Zone level of the tree, Dwelling Units Tab.

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A wall facing a garage is input as an interior wall, and thus the program will register no solar gain.

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Starting in EnergyPro V7.1, at the System level of the Building Tree, Residential tab, simply check the Wood Stove checkbox.

To model a wood stove or fireplace in older versions, create a new system in the Central System Library. Set the System Type to Split DX, set the Heating Type to Gas Furnace, Central, with an AFUE of 0.78. Zero out the cooling and fans, put ducts in the attic under the Distribution.

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Until someone submits an approved compliance option to the CEC for ductless heat pumps (mini‐split, multi‐split VRF systems) the CEC Compliance Manager simulates them as a system equivalent to the standard minimum efficiency split system A/C with a fully ducted system in the attic.

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There is no set limit to the length of names in the building tree, but CBECC adds data to the field names to keep track of the parent/child relationships and interactions. So you might want to try limiting names to 25 characters.

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Not any time soon. ASHRAE Window Attachment (used in the CEC Compliance Manager) does not use SHGCs and only has bug screens. At some future time when rules and programming can be developed, the ability to model advanced systems such as operable exterior shades may be added.

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The calculation engines in EnergyPro that are now used for Title 24 code compliance are developed and maintained by the California Energy Commission. The new Residential and Nonresidential calculation engines they provide are significantly slower than the prior ResSim and DOE-2 engines we provided in older versions of EnergyPro. The new engines incorporate CSE and EnergyPlus, which are more powerful than the older calculations, and simulate the zones much more thoroughly, resulting in longer simulation runtimes.

Try to keep the number of zones in your model to an absolute minimum, but it is not unusual to see run times of over an hour on more complex models.

To speed up run times, you can select the Quick Analysis option, which will run a partial year simulation.  In the bottom left, click on the Calculations.  In the list that appears above, select either Res T24 Performance or NR T24 Performance.  On the right will appear the option for Quick Analysis.  This will cut your runtime in half.  However that option will trigger a report that includes a watermark that states “Not useable for compliance” since you must run the full year for code compliance.

Another option is to check the box for “Do Not Generate PRF01/CF1R”  This will skip the report generation feature that occurs at the end and can save additional time, but you will not get the Title 24 reports needed for permitting.

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This check box is to enable modeling the exception for zonally controlled systems with a bypass duct to only meet 150 CFM/ton. The 150 CFM/ton (an energy penalty) does not have to be verified by a HERS Rater, however any level higher than 150 CFM/ton for a zoned system and any if you want to include a bypass duct and not meet 350 CFM/ton.

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TDV Model

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To model a Gas Boiler with Radiant Floor Heating, start at the Central System Library.

At the Heating Tab:

System Type: Split DX

Heat Type: Hot Water   (Will use efficiency from boiler)

Heating Output: Output of System

Cooling tab: enter relative cooling information, or Zero for output if there is no cooling (See the topic on No Cooling)

Fans Tab: 0 cfm, 0 hp

At the System Level of the Building Tree:

General Tab:

Select the Central System entry created above.

Hydronic Space Heating: Choose DHW or Boiler provide heat. Note this will point the program to either the DHW or the Heating Hot Water tab at the Plant level of the tree for the source of heat.

Distribution Tab:

Heating Distribution: Radiant Floor

Select a heated slab-on-grade from the library at the Slab element.

Notes:

If the same boiler is used for radiant floors and domestic hot water, model the boiler in the DHW tab and at the System level of the tree select ‘DHW boiler provides heat’.

Sample file located in My Documents\EnergyPro x\Projects\Low-rise Combined Hydronic.bld

It may be the case that there is a dedicated boiler for radiant heat. In this case, model that boiler in the Boiler tab and in the Residential tab select ‘Heating boiler provides heat’. Then model the Domestic hot water (used for sinks, showers) in the DHW tab.

A sample file is located in My Documents\EnergyPro X\Projects\Lowrise Res Separate DHW & Hydro.bld

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If you are getting no results when you calculate a model (not even all zeros) or you are getting an unhandled exception when you calculate, your path may be corrupt. To fix this, go to Tools / Options.  Next to Results, are there two C:/…? Your paths for libraries, projects and results should be something along the lines of the screenshot below.no results

 

If you have a longer path for results change it to be just like the other two with Results (capital R) as the last word.

Notice that you will need to restart the program before the changes will take effect.

 

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Below is a list of tabs in which you need to enter information for a residential title 24 calculation. You will not need to enter every available input in each tab.

Building icon:

Building Icon

 

Project Design Data, Project Title, Designer

Plant Icon:

Plant Icon

 

Heating Hot Water (if you have a boiler for space heating which is separate from the domestic hot water heater), Domestic Hot Water

System Icon:

System Icon

General, Distribution, Residential, Hers Credits (if you are taking HERS Credits)

Zone Icon:

Zone Icon

          General

Room Icon:

Room Icon

 General

Within the Room icon, you will enter building assemblies such as Roofs, Walls and floors by right clicking on the room icon and selecting Add / …

You do not need to model lighting in a residential title 24 calculation.

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In the Central System Library, create a new system. Set the System Type to SplitDX. Now, set the heating type to Electric, and input the HSPF as 3.413

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Prescriptive measures are the values of the standard package A in that climate zone – it is also the design of the baseline building; mandatory measures have to be meet no matter what. For example if a building may comply using the performance approach, with only R-7 insulation in a raised floor, but R-19 must be installed because that is the mandatory minimum.

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Interior surfaces are surfaces between two spaces and can be either walls, ceilings or floors.  Note that interior walls can also contain doors.  If you have an interior window, treat it as an interior door in an interior wall.  Insert an interior surface in the room and set it adjacent to the other room.  If you do not set it adjacent to another room, or you set it adjacent to itself, it is treated as adiabatic.

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Title 24 only allows partial credit for PV in lowrise residential new construction applications in climate zone 1-5 and 8-16 in the 2016 code, otherwise you will not get credit for photovoltaic towards compliance.  Note that this credit does not apply to additions and alterations.  You must input a minimum system size of 2 kWdc for single family and town house projects and 1 kWdc per dwelling unit in a multi-family building.  Note that larger homes may require a larger system.  If the PV system does not meet the minimum threshold for larger homes, you will receive a message on the CF1R alerting you to this minimum, but this cannot be reported until after the calculation is complete so be sure to check the CF1R after the calculation.  If you are calculating an EDR rating, you will get full credit for the PV.

LEED also gives you credit for photovoltaic production, and can be entered into EnergyPro.  To enter your photovoltaic electrical production, go to the PV tab at the top level of the Building Tree.  You will need to enter PV production and cost values for LEED, for Title 24 you only need the kW rating.

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For Title-24 compliance purposes, the CEC requires cooling to be included in the proposed building model.  When modeling a low-rise residential project, the software will include a default cooling system when calculating the results.  This system is defined automatically and you have no option to change the definition of the system.  When modeling a nonresidential project, you are responsible to define the default cooling system for your project, you cannot leave it undefined.  This would be a code minimum efficiency cooling system included as part of your model.

If you find your cooling numbers are causing the building not to comply, review your window inputs and in particular the SHGC since that will affect the cooling usage of the default system.

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No, the standard building is a fixed entity based upon Title 24 guidelines, and the CEC does not permit you to change this.  To see the building comparison that Title 24 uses in the standard design, look at the Residential and Nonresidential Alternative Calculation Method Manuals.

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You probably have a wall, roof or floor selected that has a name which does not match the actual R value of the assembly.  See screenshot below.  You can name a wall anything you want.  The actual R value that will be used in the calculation and will show up on the report is highlighted in the screenshot.  You will need to select a different assembly with the proper R value.

 

Building ASssembly R Value

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Because the PRF-01 and CF-1R reports are created through an online based report generator on the CEC website, you will have to have an Internet connection in order to generate any Certificates of Compliance. Assuming you have Internet, you might check with your IT department to see if your system blocks the report generator from being accessed. You also have the option of turning off the reports, this option is found by clicking on the bottom left “Calculations” and then in the list above selecting the appropriate calculation.  The display on the right will show the option to turn off the reports. You will eventually have to uncheck tis option and rerun the calculations to get the final Certificate of Compliance.

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Yes, since all single family buildings regardless of number of stories are considered low-rise residential, you can use do this (the three-story limit does not apply to Occupancy Group R-3). Note however that the CEC CBECC Res engine is limited to 3 stories so you will just have to trick it and input the building as though it were 3 stories.

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If you select the Calculation option on the bottom left side of the screen, then select the T24 Performance calculation (either Res or NR) in the list that appears above this selection, you will see an option to “View CBECC Log”. If you click on this button, you will see the CEC log file reporting the results of the simulation. Note that this file will not exist unless you first uncheck the option for “Delete Temporary Files”, then click on calculate to run the simulation. At the end of the simulation you can view this log file and see what problems you have.

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6. Nonresidential Title 24 (17)

Select the Assembly Library by clicking on the Libraries in the bottom left corner and selecting the library in the list that appears above.  Now in the right pane, select your roof assembly.  Check the box that indicates the roofing is CRRC-1 certified, then enter your roof reflectance and emittance.  This data will come from your roof properties, typically obtained from the Cool Roof Rating Council website.

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Our software support services are confined to issues related to running the software, not how to get a building to comply so this is not something you should contact us about.  However, we do realize the 2016 code is much tougher so we have compiled some ideas below for you to consider.

Things to consider.

In addition, getting a better idea of what the Standard Building looks like so you will understand the budget would be a good idea. There are a lot of online resources to help you understand the energy code including trainings offered by the utilities.  Our support forums also will give you the opportunity to see how other users are getting their buildings to comply.  Another resource for information on the code would be the Energy Code Ace website.

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They are just warnings, if you feel your inputs are set properly then it is fine to ignore them.  EnergyPro sets standards for these inputs and gives you a warning if anything is more than 30% outside of that range.

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There is no set limit to the length of names in the building tree, but CBECC adds data to the field names to keep track of the parent/child relationships and interactions. So you might want to try limiting names to 25 characters.

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Not any time soon. ASHRAE Window Attachment (used in the CEC Compliance Manager) does not use SHGCs and only has bug screens. At some future time when rules and programming can be developed, the ability to model advanced systems such as operable exterior shades may be added.

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The calculation engines in EnergyPro that are now used for Title 24 code compliance are developed and maintained by the California Energy Commission. The new Residential and Nonresidential calculation engines they provide are significantly slower than the prior ResSim and DOE-2 engines we provided in older versions of EnergyPro. The new engines incorporate CSE and EnergyPlus, which are more powerful than the older calculations, and simulate the zones much more thoroughly, resulting in longer simulation runtimes.

Try to keep the number of zones in your model to an absolute minimum, but it is not unusual to see run times of over an hour on more complex models.

To speed up run times, you can select the Quick Analysis option, which will run a partial year simulation.  In the bottom left, click on the Calculations.  In the list that appears above, select either Res T24 Performance or NR T24 Performance.  On the right will appear the option for Quick Analysis.  This will cut your runtime in half.  However that option will trigger a report that includes a watermark that states “Not useable for compliance” since you must run the full year for code compliance.

Another option is to check the box for “Do Not Generate PRF01/CF1R”  This will skip the report generation feature that occurs at the end and can save additional time, but you will not get the Title 24 reports needed for permitting.

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If you are getting no results when you calculate a model (not even all zeros) or you are getting an unhandled exception when you calculate, your path may be corrupt. To fix this, go to Tools / Options.  Next to Results, are there two C:/…? Your paths for libraries, projects and results should be something along the lines of the screenshot below.no results

 

If you have a longer path for results change it to be just like the other two with Results (capital R) as the last word.

Notice that you will need to restart the program before the changes will take effect.

 

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Prescriptive measures are the values of the standard package A in that climate zone – it is also the design of the baseline building; mandatory measures have to be meet no matter what. For example if a building may comply using the performance approach, with only R-7 insulation in a raised floor, but R-19 must be installed because that is the mandatory minimum.

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Interior surfaces are surfaces between two spaces and can be either walls, ceilings or floors.  Note that interior walls can also contain doors.  If you have an interior window, treat it as an interior door in an interior wall.  Insert an interior surface in the room and set it adjacent to the other room.  If you do not set it adjacent to another room, or you set it adjacent to itself, it is treated as adiabatic.

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For Title-24 compliance purposes, the CEC requires cooling to be included in the proposed building model.  When modeling a low-rise residential project, the software will include a default cooling system when calculating the results.  This system is defined automatically and you have no option to change the definition of the system.  When modeling a nonresidential project, you are responsible to define the default cooling system for your project, you cannot leave it undefined.  This would be a code minimum efficiency cooling system included as part of your model.

If you find your cooling numbers are causing the building not to comply, review your window inputs and in particular the SHGC since that will affect the cooling usage of the default system.

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All occupancies from “Waiting Area” and above can be used for Title-24 compliance.  All occupancies below “Waiting Area” are intended for hospital modeling only.

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No, the standard building is a fixed entity based upon Title 24 guidelines, and the CEC does not permit you to change this.  To see the building comparison that Title 24 uses in the standard design, look at the Residential and Nonresidential Alternative Calculation Method Manuals.

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The baseline building is a Packaged DX system in this case.  This system may not have pumps and has no cooling tower, so the reported energy will be zero.  This is a standard comparison that is dictated by the code you are comparing to and the software cannot change what the budget building looks like.

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All nonresidential forms are certificates of compliance and should go on the plans.

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Below is a list of tabs in which you need to enter information for a non-residential title 24 calculation. You will not need to enter every available input in each tab.

Building icon:

Building Icon

Project Design Data, Project Title, Designer, Lighting Designer (if lighting is part of your scope), Mechanical Designer (if Mechanical is part of your scope), Outdoor (if outdoor lighting is in your scope)

Plant Icon:

Plant Icon

Heating Hot Water (if you have a boiler for space heating which is separate from the domestic hot water heater), Chiller Water (if you have a built up HVAC system with a chiller) Hydronic (if you have a ground coupled system) Domestic Hot Water (unless DHW is not in the scope), Renewables (if there is a solar hot water heater you would model it here, you can ignore the Solar Space Heating and electricity production inputs)

System Icon:

System Icon

General, Distribution, MCH-2 (if your model includes MCH-2 features)

Zone Icon:

Zone Icon

         

General, Lighting, Mechanical (if you have zonal mechanical boxes or wish to adjust the ventilation)

Room Icon:

Room Icon

General, Infiltration, Occupant, Receptacle/Process, exhaust fan, lighting (if you are taking task or daylighting credits).

Within the Room icon, you will enter building assemblies such as Roofs, Walls and floors by right clicking on the room icon and selecting Add …

 

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You probably have a wall, roof or floor selected that has a name which does not match the actual R value of the assembly.  See screenshot below.  You can name a wall anything you want.  The actual R value that will be used in the calculation and will show up on the report is highlighted in the screenshot.  You will need to select a different assembly with the proper R value.

 

Building ASssembly R Value

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If you select the Calculation option on the bottom left side of the screen, then select the T24 Performance calculation (either Res or NR) in the list that appears above this selection, you will see an option to “View CBECC Log”. If you click on this button, you will see the CEC log file reporting the results of the simulation. Note that this file will not exist unless you first uncheck the option for “Delete Temporary Files”, then click on calculate to run the simulation. At the end of the simulation you can view this log file and see what problems you have.

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7. Nonresidential Lighting (6)

Navigate to the top level of the Building Tree and select the Forms tab.  In this tab you will find an LTI and an LTO selection.  These will allow you to input any mandatory lighting controls that are needed for the report in the list on the right (hit the yellow Plus sign to add a control).  Based upon the controls selected, most of the checkboxes will be taken care of on these reports.  The remainder of the checkboxes can be selected from within this tab.

Note we provide a sample file (My Documents\EnergyPro x\Projects\Nonres Sample.bld) that demonstrates a complete example of these controls.

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The LTI-05 is an obsolete form, replaced with the new LTI-E form.  This form is listed at the very bottom of the list of Prescriptive forms.  EnergyPro will still produce the LTI-05 form (track lighting worksheet) in a blank format, with spaces for you to fill in the necessary information once you are in Adobe Acrobat, but it will fill this information out in the new LTI-E form.

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These sheets are filled out in the field after construction by the Acceptance Testing Technician.  You can find them under Help | Title 24 Manuals | Nonres Compliance Manual.

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The best way to create a tailored lighting report is to edit the sample file ‘Tailored Lighting.bld.’  This file is in the projects file located: My Documents\EnergyPro X\Projects.

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These two occupancies are listed as exempt lighting under Section 140.6 of the code, and as such the lighting does  not appear on the reports, nor does it affect any calculated results.  Basically the lighting is subject to mandatory measures, but the quantity of lighting is unregulated and thus not reported.

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Click on Calculations in the lower left.  Now select the NR T24 Prescriptive calculation in the list right above that.  On the right, you will see the option to select using “Complete Building” as your category.  If you uncheck this, EnergyPro will use Area Category and/or Tailored.  You can also change the Complete Building Category here.

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8. Nonresidential Mechanical (5)

Included with EnergyPro is a flexible heating input tab in the Central System Library.  The system selection choices give you the ability to specify any source of heating, when dealing with most systems.  The inputs allow you to specify a hot water coil, for instance, combined with a Packaged DX system.  This type of input would allow the user to model a radiant floor heating system fed by a boiler, with a conventional packaged system providing air conditioning.

In the Plant element, under the Heating Hot Water tab, create a boiler or select one from the Boiler Library.  Enter the Boiler pump size and flow rate.

In the System element, create a HVAC system with the appropriate system type and ‘Hot Water’ as the heating type.

The hydronic system may also have a cooling component, in which case, you would also model the cooling information (see the topic on No Cooling if none exists).

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For Nonresidential buildings, starting with the 2013 modeling rules, the Standard (Budget) building will have a Variable Air Volume (VAV) system anytime the building being modeled is greater than 10,000 sqft or more than one story. Your proposed design is likely a Constant Volume system, and thus is going to have significantly higher fan power usage than the Standard building. We have been recommending you choose prescriptive compliance in these circumstances.

For High-rise Residential buildings, the Standard building will have fans that run intermittently instead of a continuous running fan for the guest rooms.  Check your input at the Central System, Controls tab to see what setting you have for the fan operation, and consider if using Natural Ventilation (Zone level of the tree, Mechanical Tab) will be possible.

In both cases, review your inputs for the fan BHP to be sure this number is not excessive.  For VAV systems, review the airflows you have input at the Zone level of the tree, Mechanical tab as well as the VAV turndown ratio indicated on the VAV terminal box.

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In the Central System Library, create a new system. Set the System Type to SplitDX. Now, set the heating type to Electric, and input the HSPF as 3.413

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In the Central System Library, in the Outdoor Air Tab, select 100% OA in the Economizer Type dropdown list.

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Supply CFM is input in the Central System library, Fan Tab.

OA CFM is input in the Room Level of the Tree, Occupant Tab.

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9. Nonresidential Title 24 Performance (23)

Here are some examples of errors and the causes.

2016-May-12 14:13:45 –  3: Temperature (low) out of bounds for zone=13-PARKING GARAGE -LV 2 for surface=RAISED FLOOR542

In this example, the zone has not been modeled properly.  You may have taken some shortcuts on inputting the surfaces and don’t have a complete description of the zone.  While we ask for 3 surfaces minimum, it is important that those three surfaces comprise a significant area of the zone.

2016-May-12 14:13:45 – 23: Surfaces in Zone=”10-PARKING GARAGE -P2″ do not define an enclosure.
 Number of surfaces <= 3, view factors are set to force reciprocity.

Similar to the above warning, this space has incomplete geometry.  Possibly adding a 4th surface will satisfy this condition.

2016-May-12 14:13:45 –  15: GetSurfaceData: The total number of floors, walls, roofs and internal mass surfaces in Zone 15-LOBBY / RESTROOM
 is < 6. This may cause an inaccurate zone heat balance calculation.

While rare, you may have circumstances where you need to define up to 6 surfaces to satisfy the CBECC simulation.

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You probably have a ductless system and have specified the ventilation at the Zone level of the Tree, Mechanical tab as coming from the HVAC system, but that type of system cannot provide ventilation.  The typical error appears as:

“thermalzone ‘x’ has ‘forced’ ventilation, but the ventilationsystem for the thermalzone ‘x’ is not defined.”

At the Zone level of the tree, Mechanical tab, change the ventilation over to another choice (but not natural ventilation if it is a commercial occupancy)

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When modeling cooling towers, it is very important that you input the tower parameters accurately since the CBECC simulation is very sensitive to these inputs.  A message such as this may appear in the LOG file.

2016-Dec-05 19:19:43 –        1: Autosizing of cooling tower UA failed for tower XXXX
2016-Dec-05 19:19:43 –     EnergyPlus Severe Error(s) (1):
2016-Dec-05 19:19:43 –        1: Bad starting values for UA

Review the following parameters on the cooling tower for accuracy as it relates to the load served by the tower.

Tower Tonnage (In the case of a chiller, this generally should be about 20% more than the chiller tonnage)

Tower Setpoint (we suggest 80 degrees)

Tower Fan Airflow (we suggest 200 cfm/ton)

Condenser Water Flow Rate (It is very important this is consistent with the tower tonnage, very low or very high gpm/ton flows here cause problems, so typically 3 gpm/ton)

Careful and accurate input of these parameters will ensure a successful simulation of the tower.

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One cause of this is the Visible Transmittance (VT) of the windows in the building, which affects the amount of daylighting provided and this affects how effective the daylighting controls will be in their ability to reduce the electric lighting usage.  The CEC CBECC engine accounts for this by modifying the energy usage of the Standard building in response to the VT of your window selections.  Please review the Prescriptive Envelope criteria for window VT to see what the budget building is using as the reference VT.

A second cause is you have large spaces subject to daylighting provided via skylights and windows as outlined in Section 140.3 of the code.  This section calls for daylighting openings to be provided in a space and your lack of those daylighting openings results in more electric lighting usage than the Standard building.

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You are probably seeing a message such as:

 “airsystem ‘xyz” has fan control = ‘cycling’, but this system is defined to provide ‘forced’ ventilation for control zone ‘zone A’ evaluating rule: set checkcode airsys:fanctrl (75:’hvacsecondary-systemcontrols.rule line 330)

This is a message from the CEC CBECC side and basically indicates you have a Zone in which the HVAC system will be providing the ventilation.  However, in the Central System Library, at the Controls Tab, you have indicated the fans do not run continuously.

The fans must run continuously to provide ventilation if the ventilation comes from the HVAC system.  You should change this setting to Continuous.

Note that the ventilation setting is done at the Zone level of the tree, Mechanical tab.  In Hghrise Residential/ Hotel Motel occupancies it is acceptable to use Natural Ventilation and thus this could be set to “Natural”, with the fans set to “Intermittent” but not in commercial occupancies.

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In the assembly editor, you will add Exterior Insulation to your wall assembly.  If the project is Nonresidential Performance, this will be done in the Layers tab by clicking on the Yellow Plus sign to add a layer.  Double click on the layer and select an insulation material from the material list, then move it so it is on the exterior of the wall framing.

If the type of project is Prescriptive, then edit the JA4 tab and simply type in the R-Value of the insulation in the Exterior Insulation entry.  If the project is a Residential Title 24 Performance project, enter the Exterior Insulation on the Res T24 Performance tab.

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For residential projects starting in the 2016 code, the standard water heater is a gas fired tank-less water heater in both the Prescriptive and Performance compliance approaches so using any unit with a tank, and especially an electric water heater will produce a significant penalty.

For commercial projects, the standard water heater under Performance is also a gas water heater.  However, under Prescriptive, you are allowed to use an electric water heater.  Our recommendation is to submit the DHW using the NRCC-PLB-01 form which is available under the NR T24 Prescriptive forms list.

Under the Calculation Options, bottom left button, click and you will see the NR T24 Performance calculations in the list above.  Select this, then on the right unclick DHW from the scope and then rerun and the penalty will be gone.

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In order to guarantee a unique name for each element in the tree (which is a requirement of the CBECC-Com engine), we add a numeric after the name to ensure uniqueness.  You cannot remove the number, it is needed since every item must have a unique name, which can get very burdensome since this would mandate each individual window/wall etc. be given a unique name as you are doing your inputs.

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Typically the error will read something like this:

Error:  Construction assembly ‘CONC. WALL7’ may not be assigned to surfaces with more than one Status, i.e. New, Altered or Existing

A limitation of the CEC CBECC engine is that any assemblies or windows in the Building Tree that have a different Status (ie Existing/New/Altered) may not point to the same Assembly or Fenestration entry in the library.

The solution is to create a unique entry for each case, for example create a wall named (e) CONC. WALL that would be assigned to the surfaces that are existing, create another called (n) CONC. WALL for the new instances.

 

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Since a single zone system only has one thermostat, the first zone listed in the tree is the control zone, the other zones just get whatever the control zone calls for.  This should be modeled as one system for each zone.

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The calculation engines in EnergyPro that are now used for Title 24 code compliance are developed and maintained by the California Energy Commission. The new Residential and Nonresidential calculation engines they provide are significantly slower than the prior ResSim and DOE-2 engines we provided in older versions of EnergyPro. The new engines incorporate CSE and EnergyPlus, which are more powerful than the older calculations, and simulate the zones much more thoroughly, resulting in longer simulation runtimes.

Try to keep the number of zones in your model to an absolute minimum, but it is not unusual to see run times of over an hour on more complex models.

To speed up run times, you can select the Quick Analysis option, which will run a partial year simulation.  In the bottom left, click on the Calculations.  In the list that appears above, select either Res T24 Performance or NR T24 Performance.  On the right will appear the option for Quick Analysis.  This will cut your runtime in half.  However that option will trigger a report that includes a watermark that states “Not useable for compliance” since you must run the full year for code compliance.

Another option is to check the box for “Do Not Generate PRF01/CF1R”  This will skip the report generation feature that occurs at the end and can save additional time, but you will not get the Title 24 reports needed for permitting.

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The CEC has a default chiller operating assumption that is always used for the standard building.  Basically, multiple chillers are sized equally and sequenced on incrementally as the load increases.  The inputs that you use to sequence your chiller operation will not affect the standard building.

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TDV Model

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For Nonresidential buildings, starting with the 2013 modeling rules, the Standard (Budget) building will have a Variable Air Volume (VAV) system anytime the building being modeled is greater than 10,000 sqft or more than one story. Your proposed design is likely a Constant Volume system, and thus is going to have significantly higher fan power usage than the Standard building. We have been recommending you choose prescriptive compliance in these circumstances.

For High-rise Residential buildings, the Standard building will have fans that run intermittently instead of a continuous running fan for the guest rooms.  Check your input at the Central System, Controls tab to see what setting you have for the fan operation, and consider if using Natural Ventilation (Zone level of the tree, Mechanical Tab) will be possible.

In both cases, review your inputs for the fan BHP to be sure this number is not excessive.  For VAV systems, review the airflows you have input at the Zone level of the tree, Mechanical tab as well as the VAV turndown ratio indicated on the VAV terminal box.

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Section 120.1(b) of the code dictates the minimum amount of outside air that must be provided based upon the occupancy type of the space.  This is a known quantity based upon your Zone Occupancy selection, and as a result you cannot go below this minimum.  Changing the occupant density and the cfm/occupant at the Room level of the Tree, Occupant tab will have no impact, since the values taken from 120.1(b) are hardwired into the CEC CBECC engine.  The only change you can make is to increase the outside air above the minimum, this is done by going into the Room level of the Building Tree, Occupant tab, and increasing the Occupant Fraction above the default of 50% (taken from 120.1(b)) to a higher number.

Note that changes to the ventilation numbers will impact your load calculations, since you are free to input any values you wish for these calculations.

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This issue has been reported to the CEC and they anticipate addressing this in a future release. For now, our suggestion is that you upsize the DHW system per this message. Note that the size shown in this message is the required output and volume of the DHW system, while EnergyPro has you enter the input rating so you will need to adjust accordingly.

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Starting in version 6.5 of EnergyPro, we now have a new layer by layer editor incorporated into the Assembly library. Note that the only way to define an assembly for the NR Performance calculations is using the layered approach. Note also that these layers do not affect any other calculations, just Nonresidential performance modeling. Also, any entries made on the JA4 tab of the editor (rigid insulation, etc) will not be seen in the Nonresidential performance simulation, so If you need to add rigid insulation you will have to add a layer into the Layers tab.

Please be aware that older assemblies from prior versions will have a minimum set of layers built into the assembly, so it is very important that you review these layers before you proceed with your analysis.

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The list of materials published in EnergyPro is the only list that the CEC permits in the simulation. While the CEC may decide to add additional materials in a later release, for now you must work with that list. The CEC will permit you to build layers to represent a particular material.

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You will need to edit the assembly layers to meet the code minimum u-factors dictated by the Title 24 code. See the topic “How do I create an assembly for the new NR T24 Performance calculation?” for details.

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When modeling this type of system with the DOE-2 calculation, we had you put in a dummy zone. That is no longer needed, nor should you do that with the new CBECC Com calculation running under the Nonresidential T24 Performance calculation. Note that currently, this only permits DOAS systems feeding Four Pipe Fan Coil, Packaged Terminal Air Conditioners and Heat Pumps, Hydronic Heat Pumps, SplitDX , PackagedDX and Single Packaged Vertical Units. Simply create that system as you have per prior instructions, and select the “Outside Air From” setting at the system level of the tree. See the DOAS.bld example we include in the sample files section.

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Because the PRF-01 and CF-1R reports are created through an online based report generator on the CEC website, you will have to have an Internet connection in order to generate any Certificates of Compliance. Assuming you have Internet, you might check with your IT department to see if your system blocks the report generator from being accessed. You also have the option of turning off the reports, this option is found by clicking on the bottom left “Calculations” and then in the list above selecting the appropriate calculation.  The display on the right will show the option to turn off the reports. You will eventually have to uncheck tis option and rerun the calculations to get the final Certificate of Compliance.

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The CEC provides a number of FAQs related to the CBECC Com engine used by EnergyPro at the following link.

http://bees.archenergy.com/faq.html

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If you select the Calculation option on the bottom left side of the screen, then select the T24 Performance calculation (either Res or NR) in the list that appears above this selection, you will see an option to “View CBECC Log”. If you click on this button, you will see the CEC log file reporting the results of the simulation. Note that this file will not exist unless you first uncheck the option for “Delete Temporary Files”, then click on calculate to run the simulation. At the end of the simulation you can view this log file and see what problems you have.

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9a. Green Point Rated (3)

The GreenPoint Rated Module was developed in partnership with Build-It-Green, this module will calculate the energy point score used for compliance with the GreenPoint Rated scoring system used for rating existing homes. In addition, it will produce the form GPR-1 compliance certificate needed to demonstrate compliance with the GreenPoint Rated system.  You can find out more information regarding Build It Green at:

 

http://www.builditgreen.org/energy-efficiency.

 

EnergySoft is working in partnership with Build It Green to support the GreenPoint Rated program for existing residential projects in California, EnergySoft developed an EnergyPro module to generate a GPR baseline from which the design can be awarded points for a GreenPoint Rating.

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The GreenPoint Rated program can be used for new and existing homes in California.  The GreenPoint Rated module generates a GPR baseline from which the design can be awarded points for a GreenPoint Rating.

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Yes, appliance information for your project should be filled out in the Dwelling Tab at the Zone level of the building tree.

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9b. LEED (17)

LEED projects can use the ASHRAE 90.1 (module NRM7) for the baseline calculations. The calculations are for filling out the LEED Energy and Atmosphere Credit Templates (EAc1 and EAp2). Please make sure you have the BEPS and BEPU report selected at the top level of the building tree in the Utility tab before you run the calculation.

To fill out the tables in the LEED documents, please reference the DOE-2 results .sim files for both the baseline and proposed cases located in My Documents\EnergyPro 7\Results folder.

Please open the .sim files for both the baseline and proposed cases in Notepad by dragging the file into Notepad, search for BEPU.  Note the BEPU also shows any unmet load hours at the bottom.

 

 

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LEED refers to this as a District Energy System (DES).  You should begin by reading the DES Guidance from USGBC.

Once you have decide which option from the guidelines you will use, following these instructions:

Option 1 – This approach requires you to treat the plant chilled water and hot water as purchased commodities thus removing any efficiency associated with the central plant from the model.  You will model your HVAC systems as normal and input whatever central plant is appropriate for the chillers, boilers, towers and pumps (you will be discarding all of these numbers so it is not important).  When running the calculations, under the Calculation Options, check the box for CSV reporting (covered in another FAQ) and uncheck Delete Temporary Files.  Now you can run the calculations.

After the calculations are complete, you will open the CSV file in Excel and you will find hourly data for the various end uses (note the units of each column).  The columns for Heating, Cooling, Heat Rejection and Pumps* can be discarded.  On the far right you will find columns for Chilled Water and Hot Water demand for the building.  These are the purchased commodities you will use to follow the DES guidelines.  Any columns that represent normal building usage (lighting, fans, receptacle) should get multiplied times the virtual rate for Gas or Electricity (found on the EAC1 report). The Chilled Water and Hot Water use is multiplied times the rates given in the DES Guidance and you will have a spreadsheet that documents total energy cost for your building.

In some cases, the Baseline building may not be a chilled water system so EnergyPro will configure a baseline with DX equipment.  In this case, you can force EnergyPro to use a chilled water system by changing one of the Zones to a Floor Number of 5 and it will structure the baseline as chilled water.

Option 2 – With this option you are allowed to model the actual efficiencies of the central plant in EnergyPro only you will scale the actual equipment according to the load served.  Be sure you understand the documentation requirements given in the DES Guidance document from USGBC since this approach requires supporting data on the efficiencies you are using.

*If you have only pumps as part of the CUP, discard the pump number from the calculation since it is part of the purchased commodity.  However, if you have local pumps at the building, model those and include them in the building energy usage numbers.

 

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They are just warnings, if you feel your inputs are set properly then it is fine to ignore them.  EnergyPro sets standards for these inputs and gives you a warning if anything is more than 30% outside of that range.

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Note that this section applies to non-Title 24 applications of VRF systems.  For Title 24 applications, see this FAQ.

The VRF models are located in the sample files, located in the example files section of this site.  You will need to export the systems from the sample file into the file you are working with.  Begin by opening your project, and then open one of the sample files with the Manufacturer name of the models you wish.  Navigate into the Central System library in the sample file by clicking on the bottom left button “Libraries” and then in the pane above, select “Central”.  A list of models will appear on the right for you to select.  You can select multiple systems by clicking on one system, then holding down the shift key and selecting another system.  Once you have selected all of the systems you want to export, select the export button on the top of the window.  Select your project from the window that appears (you may need to scroll to the bottom of the window) and hit ‘OK’.  The systems you had highlighted will now be available in your project.

Repeat this procedure by selecting the “Zonal” library and exporting all of the indoor units.

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Since a single zone system only has one thermostat, the first zone listed in the tree is the control zone, the other zones just get whatever the control zone calls for.  This should be modeled as one system for each zone.

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Below is a list of tabs in which you need to enter information for a non-residential LEED calculation. You will not need to enter every available input in each tab.

Building icon:

Project Design Data, Project Title, Designer, Lighting Designer (if lighting is part of your scope), Mechanical Designer (if Mechanical is part of your scope), Outdoor (if outdoor lighting is in your scope), Utility

Plant Icon:

Heating Hot Water (if you have a boiler for space heating which is separate from the domestic hot water heater), Chiller Water (if you have a built up HVAC system with a chiller) Hydronic (if you have a ground coupled system) Domestic Hot Water (unless DHW is not in the scope), Renewables, Exceptional

System Icon:

System Icon

General, Distribution

Zone Icon:

Zone Icon

         

General, Lighting, Mechanical (if you have zonal mechanical boxes or wish to adjust the ventilation), schedules

Room Icon:

Room Icon

General, Infiltration, Occupant, Receptacle/Process, exhaust fan, lighting (if you are taking task or daylighting credits).

Within the Room icon, you will enter building assemblies such as Roofs, Walls and floors by right clicking on the room icon and selecting Add …

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The SS-Z documentation is reporting the VRF system performance only.  This is how DOE-2 reports the outside operation and system performance of VRF systems.

 

The PS-D reports the Total Plant Loads for the entire project as compared to the reporting of the VRF system only as found on the SS-Z report.

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Most utility rates are either tiered (residential) or time of use (commercial). As a result, different charges will occur depending upon when your building is using energy, as well as how much it uses. Energy usage in the higher tiers tends to be more expensive, as is the energy usage during peak periods. Unless the baseline building and your building have exactly the same load profiles, the virtual rate is going to vary. In addition, many rates carry a base monthly meter charge that can be substantial and is included in the overall rate.

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At the Top level of the Building Tree, Utility Tab, you will find selections for all of the available DOE-2 reports.  Select them as necessary but be careful, if you select too many, DOE-2 will not run since it is more reports than it can handle.

Now, go into the Calculation Options, select your desired calculation and on the right side of the screen, deselect “Delete Temporary files”

Once you do this, rerun the calculations, and go to My Documents\EnergyPro 7\Results\ProjectName and you will see the files with the .SIM extension.

You can also go to the Report selections in EnergyPro and choose to print these from the interface.

See Screen Shot below.

DOE reports

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If a file is crashing, check the DOE file to see why. The DOE file error message may be a bit confusing, but will give you an idea of why the file is crashing.

To check the DOE file, uncheck the ‘delete temporary files after calculation is complete’ button in the calculation you are running.

Then go to the results folder located at My Documents/EnergyPro 6/Results. A folder with your projects name will contain a file called ‘proposed.bdl’.

Search proposed.bdl for the word ‘Error’. There will be many results, you are looking for the word ERROR with many stars across the page (ERROR*********************************). Right after the string of stars there will be a message that states why the file is crashing.

Dates not is sequence means that the utility weekly schedule, or a zonal schedule has dates out of order. Schedules need to be in chronological order.

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If you are getting all zeroes in your results your file is crashing or you have everything set as existing.  Your file could be crashing for a number of reasons.  A very common reason is that the interior surfaces are not inputted correctly.  Interior surfaces should be entered in conditioned spaces, and need to be set adjacent to an unconditioned space.

If you have a wall with negative area, your file will crash.  A negative area happens when you have a glazing area that is larger than the wall it is in.  For example, if you have a 60 square foot wall and a total of 70 square foot of glazing in the wall, the file will crash.  The same goes for roofs and skylights.

If you have entered Week Periods in the utility rate incorrectly, your file will crash.  Week Periods need to be is chronological order, starting on Jan. 1st and ending Dec. 31st.  The month and day is the ending day for that period.  So the top line starts on Jan. 1st and ends on the date entered.  The next line down starts on the day after the previous period ends.  The last period needs to end on Dec. 31st.  See the screenshot below.

PGE time Schedule

If you have selected many DOE-2 Reports to be run your file might crash.  Deselect all of the DOE-2 reports then select only the reports you need.

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Interior surfaces are surfaces between two spaces and can be either walls, ceilings or floors.  Note that interior walls can also contain doors.  If you have an interior window, treat it as an interior door in an interior wall.  Insert an interior surface in the room and set it adjacent to the other room.  If you do not set it adjacent to another room, or you set it adjacent to itself, it is treated as adiabatic.

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Title 24 only allows partial credit for PV in lowrise residential new construction applications in climate zone 1-5 and 8-16 in the 2016 code, otherwise you will not get credit for photovoltaic towards compliance.  Note that this credit does not apply to additions and alterations.  You must input a minimum system size of 2 kWdc for single family and town house projects and 1 kWdc per dwelling unit in a multi-family building.  Note that larger homes may require a larger system.  If the PV system does not meet the minimum threshold for larger homes, you will receive a message on the CF1R alerting you to this minimum, but this cannot be reported until after the calculation is complete so be sure to check the CF1R after the calculation.  If you are calculating an EDR rating, you will get full credit for the PV.

LEED also gives you credit for photovoltaic production, and can be entered into EnergyPro.  To enter your photovoltaic electrical production, go to the PV tab at the top level of the Building Tree.  You will need to enter PV production and cost values for LEED, for Title 24 you only need the kW rating.

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The top occupancy box titled ‘Occupancy’ is for general use.  The lower box titled ’90.1 Ltg Occupancy’ is for lighting calculations based on ASHRAE 90.1.  If you are not doing a an ASHRAE 90.1 calculation then you do not need to make any selection in the lower box.

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Most HVAC systems in EnergyPro have Exhaust Air Heat Recovery as an option on the HVAC system for Nonresidential buildings.  See the Outside Air tab inputs in the Central System for these input options.  This feature will not work with residential buildings.  Note that if you are doing a VRF system, we offer these inputs as an option in the Zonal Library for the indoor unit of the VRF on the Outside Air Tab.

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If you are modeling large packaged equipment (greater than 75,000 Btuh cooling) this type of equipment is not rated with an SEER.  Rather, an EERis typically provided by the manufacturer.  In EnergyPro, we provide you with two options for modeling this type of equipment:

1. Input an EER

2. Input a kW rating for the “Compressor/Condenser”

When rating an EER, the manufacturer includes fan power as part of the total figure, as they should.  However, to properly model these systems,

EnergyPro must take out the fan power, since you have already input this figure in the Fan tab, and develop an energy rating that just models the “Compressor/Condenser”.  To make matters worse, the fan power that the manufacturer included in their EER rating is probably a different number than the value you input in the fan tab.  The final twist is that the CEC specifies the amount of fan power that EnergyPro is required to remove, which does not correspond with either figure.

The solution to this problem is to use the second modeling option listed above.  By inputting just the “Compressor/Condenser” kW, you have already done the work of prying apart these numbers for EnergyPro.  The net result is that your system will be modeled correctly.

Next issue – Your system also has a pump, since it is a Mammoth/Governair/Etc. brand of system that has an evaporatively cooled condenser.  No problem.  Include the pumping energy in the “Compressor/Condenser” kW.

The obvious question, then, is why do we even provide an EER input for these systems? 

Because the ACM manual requires that we give you that option for inputs, and in many cases you really are not overly concerned about super accurate modeling.  Your client just wants a permit tomorrow, and the engineer spec’d an EER on the plans.

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You probably have a wall, roof or floor selected that has a name which does not match the actual R value of the assembly.  See screenshot below.  You can name a wall anything you want.  The actual R value that will be used in the calculation and will show up on the report is highlighted in the screenshot.  You will need to select a different assembly with the proper R value.

 

Building ASssembly R Value

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9c. Older Versions (12)

The USGBC allows LEED projects in California to be compared to the title 24 baseline.  The Title-24 LEED module uses this Title-24 baseline.  The rest of the country must compare their LEED projects to an ASHRAE 90.1 baseline.  The ASHRAE 90.1 LEED module uses this baseline.  Projects in California can be compared to either baseline and can use either module.

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Version 6 cannot read a version 4 file. You will need to convert the file to version 5 first.  See the FAQ item on how to convert from the version 4 to version 5 files.

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Version 4 requires a 32-bit operating system on your computer since it is a very old version.

In order to convert a version 4 file to a version 5 file, you must have version 4 and version 5 on your computer. Version 4 does not need to be unlocked, just installed on your computer. The following link will take you directly to a version 4 download: http://www.energysoft.com/Files/EP44.exe Once you have both versions on your computer, open the file you want to convert in version 5, just like you would open any other file. The software will ask if you want to convert, select yes.

When you convert a version 4 file into version 5, you will be told that all construction assemblies will need to be updated. The assemblies are different in the two versions and cannot convert automatically. The easiest way to do this is to go into the assembly library, select all assemblies (by selecting the top assembly, holding shift, and then selecting the bottom assembly) and hitting delete.

Building Assembly

You will be asked if you want to delete the following item:… Select ‘Yes To All’. The program will not delete the assemblies being used in the model. You now have a list of assemblies used in this particular model. Highlight each assembly then re-define them by clicking the import button, and selecting a new assembly.

You will have to do this for all assembly types (walls, floors…) used in your model.

Once a file is converted to version 5, It cannot be converted back to version 4, so you might want to save as before converting.

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If you have entered a cost for doing the upgrade(alternative) and it exceeds the savings of doing this project, in terms of payback years being greater than the life expectancy, the alternative will not show as a viable option, thus not reporting the savings on the report.

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Under the Alternatives screen you check the box for Test Out, and then input the actual tested values in the Alternatives entries.

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The CEC no longer assigns any credit for removed items, only altered items.

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The information shown on the ECON-1 and ECON-2 are the calculated estimates of usage for the home, assuming typical weather conditions, and typical homeowner use patterns.  Thus, they represent the home usage, not homeowner specific usage.  The bills represent the homeowner usage. Savings estimates are based upon the home usage for program participation.

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The savings will not be cumulative because of interaction between measures. For instance, replacement AC unit might save 10% of the energy. Replacement windows might save 10% also. But when you do both, the new windows have now reduced the load on the AC, causing it to run less, so the savings from replacing it will be lower. In an extreme example, if all load on the AC was eliminated due to an efficient envelope, replacing the AC would save nothing since it never would be running.

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When you set your duct insulation for the existing home to a very low value, and you have very large levels of duct leakage, the attic becomes a heated space. Placing the insulation between the heated attic and the heated home will have minimal impact. However, when you then proceed to insulate and seal the ducts, the savings jumps up very high. Once the ducts are fixed, the attic is no longer heated and the insulation is now doing its job.  Look at the improvements as a cumulative benefit and the numbers will make sense. If the program were to rank the duct improvements first, the benefit from the insulation would make more sense.

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The software ranks the measures based upon cost effectiveness on the ECON-2 report.

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The only version prior to EnergyPro 6 that can read EnergyPro 6 and EnergyPro 7.1 files is the version 5.1.9.15 that we have posted to the website. This is a special version designed to allow you to run projects under the older versions. However, be aware that the assembly layers, zone exhaust fans and central system fan information will not transfer back to that older version and will need to get re-input.

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We stopped including that calculation in the software since the calculation is no longer valid after March 31, 2015. You will have to install the older version 6.2 if you wish to run that, but be aware the calculation is no longer acceptable for code purposes.

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Errors (107)

You are trying to run calculations that are related to the California Title 24 code.  In order to run these calculations, you must select a location that is in the list of California locations.  If you did not intend to run a Title 24 code calculation, then you need to select a different calculation.  California locations have a Climate Zone selection between 1 and 16.

 You can navigate to the top level of the Building Tree, and in the General tab, hit the Select button to select a location that is in California.

 If you did not intend to run a Title 24 calculation, click on the Calculations button at the bottom left of the screen.  In the list that appears above this selection, you will find all of the different calculations that can be run.  Ensure that all Title 24 calculations do not have their boxes checked, and check the appropriate box for the type of calculation you intend to run.

 You can now click the Calculate button on the menu bar to rerun your calculations.

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You have selected the option to run a calculation that has not been activated on your computer. This usually means that you either have not purchased this particular calculation module, or you have not entered the necessary activation code to enable this calculation.

You can verify what calculations are activated on your computer by clicking on Help | Activated Modules. If you have the activation code that was sent by EnergySoft Sales, you can enter this under Help | Software Activation.

If you think this is a calculation that you have purchased, you can contact sales@energysoft.com for further help.

If this is not a calculation that you have purchased, click on the Calculations button on the bottom left. Above this button a list of calculations will appear. Find the calculation in this list and uncheck the box that tells EnergyPro to run the calculation.

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You are trying to run a Lowrise Residential Calculation for this project, but it appears you have no valid Zones/Rooms entered that are designated as either Single Family or Multi-Family.

Begin by checking each Zone for a valid occupancy type. Below each Zone, verify that you have entered a square footage for each of the Rooms.

If you did not intend to run Lowrise Residential Calculations, you need to uncheck the option to run this calculation. Click on the Calculations button on the bottom left. Above this button a list of calculations will appear. Find the calculation in this list and uncheck the box that tells EnergyPro to run the calculation.

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You have input a project with the Number of Dwelling Units input as greater than 2 and the building is designated as having more than 3 Stories. The Standards consider this building to be a Highrise Residential Occupancy.

You have checked the calculation option to perform a Lowrise Residential calculations, which would not be appropriate for this type of building.

You can change the Number of Dwelling Units at the Zone level of the tree, Dwelling Units tab. You can change the number of stories at the Zone level of the tree, General tab.

If you did not intend to run Lowrise Residential Calculations, you need to uncheck the option to run this calculation. Click on the Calculations button on the bottom left. Above this button a list of calculations will appear. Find the calculation in this list and uncheck the box that tells EnergyPro to run this calculation.

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At the Zone level of the tree, you have input the Number of Floors as zero. You must enter a valid number that is one or greater.

At the Zone level of the tree, in the General tab, enter a valid number greater than zero.

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When describing an HVAC system that uses a water heater to provide the hot ware for the space heat (Combined Hydronic), the software will perform calculations for the boiler that account for both the Domestic Hot Water usage as well as space heating usage.

Since the calculations must be done for both the HVAC and DHW usage, you must include BOTH calculations in your scope under the calculation options when modeling this type of system.

One option is to change the system type to a conventional system at the System Level of the Tree, Residential tab.

Your other option is to select the Calculations on the lower left. In the list that appears above, select the specific calculation you are running. On the right, check the options to include both Mechanical and DHW calculations.

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At the top level of the Building Tree, you have selected a Location for the building, but the weather file associated with this location is missing from your computer. This weather file is required in order to perform the calculation you have specified.

At the top level of the Building Tree, click on the option for User Defined on the location. Now click on the Edit option and see what weather file location is specified.

You must now verify that this weather file location selected has a valid weather file located in the Program Files\EnergyPro 6\Weather folder on your hard drive.

In most cases, you should not specify your own location data. We suggest you uncheck the option for User Defined data and pick a stock location from the list of locations.

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Your Domestic Hot Water heater has an invalid Energy Factor. Select the Libraries button on the bottom left. In the list that appears above, select the DHW/Boiler library. You will see your water heater listed in the library.

Verify that you have the correct type of water heater selected (Gas Fired, Electric, Heat Pump, etc).

Now verify that you have a valid Energy Factor input for the water heater. EnergyPro will list the valid range of Energy Factors that you must conform to.

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Your Domestic Hot Water heater has an invalid Recovery Efficiency. Select the Libraries button on the bottom left. In the list that appears above, select the DHW/Boiler library. You will see your water heater listed in the library.

Verify that you have the correct type of water heater selected (Gas Fired, Electric, Heat Pump, etc).

Now verify that you have a valid Recovery Efficiency input for the water heater. EnergyPro will list the valid range of Recovery Efficiencies that you must conform to.

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The Zone input in the Building Tree does not have a valid Occupancy type selected. Navigate in the building tree to the zone, click on the pull-down for the Occupancy selection and select from the valid choices.

This type of error shows up when opening an older file from a prior code cycle in which the prior occupancy is no longer a valid occupancy in the new code cycle and requires you to reselect a valid occupancy under the new code.

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The Zone input in the Building Tree has the same name as another Zone in the Building Tree. The CEC compliance engine requires unique Zone names to run and document the project properly.

Note that EnergyPro will shorten your Zone names to conform to the CEC Compliance Manager length requirements, so only the first 25 characters of the name you have input is used. Make sure the first 25 characters of the name are unique.

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The HVAC System you have entered is not a Gas Furnace / Air Conditioner system, but is another type of system such as a Heat Pump, etc. The CEC has configured the Compliance Manager so that it will only allow the modeling of a Zonal Control system on conventional Furnace / AC systems.

You can still install this system, however you cannot take compliance credit for the home as being Zonal Control.

Zonal Control systems are specified under the Zone level of the tree, under the Occupancy type. If you have selected Res Sleeping or Res Living, this is considered Zonal Control.

You can change your HVAC system over to a conventional Furnace / AC system by editing the system at the System level of the Tree.

You can remove the Zonal Control designation at the Zone level of the tree by changing the Occupancy Type to Conditioned.

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You are doing a Multi-Family project, and the total floor area entered under the Dwelling Units tab does not match the total floor area of the Zone. These two numbers must match.

At the Zone level of the tree, look at the Dwelling Units tab and make sure the total area (unit floor area times the number of units) matches the floor area for the zone. Do not use fractional values, as these usually do not add up.

In the Zone level of the tree, look at the entries for the Rooms under the Floor Area entry and be sure you have the correct numbers entered.

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When modeling a project using the CBECC Com engine, the CEC requires that every zone have a valid floor to ensure a stable simulation within EnergyPlus.  This means you either need a slab-on-grade if this zone has a ground floor slab, an exterior raised floor if this zone is over open space or crawlspace, or an interior surface designated with a floor assembly.  The total of these surfaces needs to match the Conditioned Floor Area of the zone (which is the sum of the Room Floor Areas).

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At the Zone level of the tree, under the Occupancy Type selection you have designated at least one Zone as being Res Living. This designation means this zone is a Residential Living Zone under the CEC modeling rules for Zonal Control systems. This means the home has an HVAC system that can independently serve the living and sleeping areas of the home. Please consult the CEC guidelines in the Residential Compliance Manual for the requirements of this system design.

No other Zone in the building tree has been designated as Res Sleeping. If you wish to take this modeling credit, you must edit another Zone in the tree, and designate the occupancy as Res Sleeping.

If you do not wish to model the system as Zonal Control, edit the Zone Occupancy and change the designation to Conditioned.

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At the Zone level of the tree, under the Occupancy Type selection you have designated at least one Zone as being Res Sleeping. This designation means this zone is a Residential Sleeping Zone under the CEC modeling rules for Zonal Control systems. This means the home has an HVAC system that can independently serve the living and sleeping areas of the home. Please consult the CEC guidelines in the Residential Compliance Manual for the requirements of this system design.

No other Zone in the building tree has been designated as Res Living. If you wish to take this modeling credit, you must edit another Zone in the tree, and designate the occupancy as Res Living.

If you do not wish to model the system as Zonal Control, edit the Zone Occupancy and change the designation to Conditioned.

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At the Zone level of the tree, the Zone Type is set to Conditioned, however other Zones in the building have this set to either Res Living or Res Sleeping, which denotes you have a Zonal Control system.

When modeling a Zonal Control system, all Zones must have the Zone Type set to either Res Living or Res Sleeping. Please consult the CEC guidelines in the Residential Compliance Manual for the requirements of this system design.

If you do not wish to model a Zonal Control system, set all Zone Types to Conditioned.

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The building has a one or more floors input in the tree with a floor assembly that includes a Crawlspace. The input for the exterior perimeter of the Crawlspace (length facing to the outside) is too small for a crawlspace of this size.

If you did not mean to enter a floor with a crawlspace, find the raised floor selections in the building tree and select a different floor assembly that does not have a crawlspace.

To change the Crawlspace Perimeter, go to the top level of the building tree, select the Residential tab and enter the correct value.

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The building tree contains more than one Conditioned Zone. When modeling buildings with multiple zones, it is a mandatory modeling requirement of the CEC Compliance Manager that you must have at least one interior surface that is connecting each zone. This surface can be an interior wall, a floor that is above another zone or a ceiling that is below the floor above.

Note that you do not need to model all interior surfaces, you just need at least one between the zones. You also do not need to model the surface twice (once on each side). Inputting it once will satisfy this requirement for both the zone it is in, as well as the zone it is adjacent to. You also might consider modeling the entire house as a single zone to avoid this requirement if that is a suitable approach.

In the building, at the Zone level, select the room below the Zone. Now right mouse click on the room and select “Add”. From the list that appears, select Interior Surface.

Enter the area of the surface. If you are modeling a wall, select a wall from the assembly list. If it is a floor, select a floor. If you are modeling a ceiling to a zone above, select a roof/ceiling assembly.

Finally, you must select the Adjacent To input in the interior surface and designate the room that this surface is next to.

When inputting a floor in this instance you would input the floor as being in the second floor zone, and as Adjacent To the first floor zone. When inputting interior floors, you have the option of inputting then floor elevation. Leave it as zero and it will default to the elevation you have input for the room.

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The Domestic Hot Water boiler you have input in the DHW/Boiler library has a Standby Loss value set to zero. The CEC requires a value for this type of water heater be entered that is greater than zero.

Check to make sure you intended to enter this type of water heater. Smaller, more common federally regulated water heaters do not require this input.

You can obtain this value from the manufacturer or from the CEC Appliance directory at www.energy.ca.gov. Click on the Libraries button on the bottom left. Select the DHW/Boiler Library in the list that appears above. Now find your water heater and enter the Standby Loss value.

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You are trying to run a Nonresidential Calculation for this project, but it appears you have no valid Zones/Rooms entered that are designated as valid Nonresidential occupancy types.

Begin by checking each Zone for a valid occupancy type. Below each Zone, verify that you have entered a square footage for each of the Rooms.

If you did not intend to run Nonresidential Calculations, you need to uncheck the option to run this calculation. Click on the Calculations button on the bottom left. Above this button a list of calculations will appear. Find the calculation in this list and uncheck the box that tells EnergyPro to run the calculation.

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A Domestic Hot Water heater has not been input. This selection is required for the calculations you are performing. At the Plant level of the tree, select the Domestic Hot Water tab. Select a DHW Boiler from the library of choices.

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The Setpoint temperature for the heating side of the Hydronic loop is set to a temperature that is higher than the Cooling Tower minimum temperature. This Setpoint sets the lower limit of the condenser water loop on the Hydronic loop. Setting this temperature to a value that is higher than the high limit side set by the cooling tower will cause the boiler to try to heat the loop to this temperature while the tower is trying to cool the loop below this temperature.

A Setpoint temperature of 65 degrees is suggested for this input.

At the Plant level of the tree, In the Heating Hot Water Tab, lower the Boiler Setpoint temperature to a value that is below the cooling tower setpoint. As an alternative, go to the Hydronic tab and select the Cooling Tower and raise the Setpoint of the Cooling Tower above the boiler setting.

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Zonal type systems such as Water Source Heat Pumps, Packaged Terminal Air Conditioners and Heat Pumps and Four Pipe fan Coil systems cannot be configured to serve more than one HVAC zone given the limitation of the thermostat controls.  The CEC CBECC engine enforces this rule.

At the Zone level of the tree, make sure the system only has one Zone in the tree below the System, or choose a different system type designed to serve more than one Zone.

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A valid name is required for all Zones in the Building Tree. The name must have at least one letter, and should be a unique name. At the Zone level of the building tree, enter a valid name.

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The HVAC system has the ductwork specified as located in the attic, buried under insulation. This is a special circumstance that requires a HERS rater, and also requires the Quality Insulation Installation HERS measure be included. See the Residential Compliance Manual for more information on the details of this measure.

If you wish to continue with this measure, at the top level of the building tree, select the Residential tab.

If you do not want this measure, go to the System level of the building tree, Distribution tab. Change the setting for the Buried Ducts in Attic to Not Buried.

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The airflow rate input for the HVAC system is not valid when modeling a conventional HVAC system. The CEC restricts the airflow rate on conventional systems to a mandatory minimum of 350 cfm/ton of airflow to a maximum of 600 cfm/ton.

At the System level of the building tree, in the HERS tab, edit the airflow setting and set this number to a valid rate.

If you are modeling a Zonally Controlled system, this airflow rate is allowed to go lower than 350 cfm/ton. Zonally Controlled systems are multiple zone systems with dampers designed to independently control different areas of the home. See the Residential Compliance Manual for more information on this type of system.

If your system is Zonally Controlled, in the HERS tab you can check the box for Zonally Controlled and then a lower airflow number will be allowed.

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Each wall/roof/floor/slab must have a valid construction assembly selected to perform the simulation. Leaving an assembly as “undefined” is not a valid choice. In this case, the surface has been designated as either New or Altered. In both cases, you must describe the new assembly. In the case of altered, this will describe the assembly after alterations are complete.

In the Building Tree, navigate to the surface and click on the New Assembly which is undefined and select a valid assembly from the construction assembly library.

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The fenestration (window or skylight) has a glazing U-Factor that is not valid. You must input a valid U-Factor for the fenestration. The U-factor is the coefficient of conduction (heat transfer) for the fenestration product. This value is obtained from the manufacturer of the product.

In the Building Tree, navigate to the window or skylight and click on the fenestration selection. This will take you into the Fenestration Library where you can either select another product that is valid, or you can edit the fenestration U-Factor directly.

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Each wall/roof/floor/slab must have a valid construction assembly selected to perform the simulation. Leaving an assembly as “undefined” is not a valid choice. In this case, the surface has been designated as either Existing or Altered. In both cases, you must describe the existing assembly. In the case of altered, this will describe the assembly before alterations are made.

In the Building Tree, navigate to the surface and click on the Existing Assembly which is undefined and select a valid assembly from the construction assembly library.

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A valid selection for the Location (City) is required to perform calculations on your project. In the Building Tree, at the top level of the tree, General tab, click on the “Select” button and select a valid location from the list provided.

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When modeling Packaged Multi-Zone Systems (System Type = Packaged MZ), the DOE-2 engine does not allow the use of a Water Cooled Condenser. This is a limitation of DOE-2, so you must either choose a different system type or remove the Water Cooled Condenser.

At the System level of the Building Tree, click on the Central System, this will take you into the Central System library. You can now select a different system, or edit the current system. You can change the System Type to another system, or navigate to the Cooling tab and change the Condenser Type to another choice.

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The first zone listed below the HVAC system in the building tree represents the control zone when dealing with single zone systems. DOE-2 does not allow the first zone listed to be an unconditioned zone.

In the building tree, at the System level of the tree, click and hold on a zone and you can then drag and drop that zone so that it is the first zone directly below the System icon.

Another option is you can edit the Zone and change the Zone Type to Conditioned.

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The product is designated as having a Hydronic Heating system but no boiler has been specified. The boiler input is required when modeling Hydronic systems.

If you did not intend to model a Hydronic Heating system, navigate to the System level of the tree, and click on the Residential tab. Change the selection for the Hydronic Space Heating system to “None”.

If you did intend to model a Hydronic Heating system, navigate to the Plant level of the tree. If the system will be using a dedicated boiler, select a boiler from the library in the Heating Hot Water tab. If the system is a Combined Hydronic system (one that uses a common boiler for both space heating and domestic hot water), select a DHW boiler from the Domestic Hot Water tab.

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When modeling Built-up VAV systems that include Fan Powered Zone Terminal Boxes, it is a requirement of the DOE-2 engine that you must have at least two zones.

If you did not intend to include Fan Powered Terminal Boxes, navigate to the Zone level of the tree, and select the Mechanical tab. You can now click on the Zone Terminal and select a different terminal box from the library, or you can edit your terminal box and change the type of box.

If you did intend to include Fan Powered Terminal Boxes, you just add an additional Conditioned Zone to this HVAC system (unconditioned zones don’t count).

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Fan Powered Terminal Boxes (input at the Zone level of the building tree) can only be modeled with Chilled Water (Built-Up) Variable Air Volume (VAV) systems. This is a modeling limitation of the DOE-2 Simulation Engine. These types of terminal boxes cannot be selected when the system type is a Packaged VAV system.

At the Zone level of the Building Tree, in the Mechanical tab, you can select a different type of terminal box that is not fan powered, or you can edit the selected terminal box and change the type to a non-fan powered version.

At the System level of the Building Tree, you can select a different system type, or you can edit the current system type and change it to a Built-Up VAV system. However, keep in mind the Built-Up VAV system will require the definition of the chiller and pumps.

Some users have opted to model the fans as exhaust fans at the Room level of the building tree. Some have opted to model the DX compressor and an air cooled chiller and thus select the system type as Built-Up VAV.

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You are trying to run a Nonresidential Calculation for this HVAC System, but it appears you have no valid Zones/Rooms entered that are designated as valid Nonresidential occupancy types.

Begin by checking each Zone for a valid occupancy type. Below each Zone, verify that you have entered a square footage for each of the Rooms.

If you did not intend to run Nonresidential Calculations, you need to uncheck the option to run this calculation. Click on the Calculations button on the bottom left. Above this button a list of calculations will appear. Find the calculation in this list and uncheck the box that tells EnergyPro to run the calculation.

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Demand Control Ventilation (DCV) is a mandatory measure in the Title 24 Standards Section 120.1 in high density spaces. Zones that meet these criteria must be designated as having DCV controls to regulate the amount of outside air to the zone.

At the Zone level of the Building Tree, Mechanical tab, check the box for DCV, or at the General tab, select a different occupancy type that does not require the use of DCV.

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Each HVAC system must have a valid central system selected to perform the simulation. Leaving a system as “undefined” is not a valid choice. In this case, the system has been designated as either Existing or Altered. In both cases, you must describe the existing system. In the case of altered, this will describe the system before alterations are made.

In the Building Tree, navigate to the System level of the tree and click on the Existing System which is undefined and select a valid system from the Central System library.

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At the System level of the tree, in the Residential tab, you have indicated that you have a Whole House Fan (CFM and Watts have been input).  This feature is only available on a home that has an Attic space, since the WHF is designed to cool both the house and the attic.

At the System level of the Tree, Residential tab, you should zero out the CFM input, or you should change your roof configuration so that the house has an Attic instead of Cathedral Ceilings.

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Demand Control Ventilation (DCV) is a mandatory measure in the ASHRAE 90.1 Standards in high density spaces. Zones that meet these criteria must be designated as having DCV controls to regulate the amount of outside air to the zone.

At the Zone level of the Building Tree, Mechanical tab, check the box for DCV, or at the General tab, select a different occupancy type that does not require the use of DCV.

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Interior surfaces can either be selected as floors, walls or ceiling/roofs. When inputting an interior floor it is input in the space that is above the other space. For instance on the second floor you would input and interior floor that is over the first floor. As part of this input, the elevation of the floor must be input. We recommend you leave the elevation at zero, the program will use the floor elevation input for the Room.

Many times, a floor is input into the first floor and is designated as being over the second floor. This is not possible. This type of input would be a ceiling/roof, not a floor. A floor must be input as being above another space, a ceiling as being below another space.

Review this input for this surface and be sure you intended to input a floor and not a ceiling/roof. The type of assembly selected determines this definition. Review the floor elevation and the room elevation to be sure they are consistent with the adjacent room.

Note that interior surfaces do not need to be input twice. Thus you would input either the ceiling of the first floor or the floor of the second floor but not both.

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When modeling a slab on grade surface it is important to input the area of the slab as well as the exterior perimeter of the slab correctly.  Make sure the exterior perimeter entered is less than the area of the slab.

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The DOE-2 engine has a limitation that only allows you to model four central utility plants. The building tree contains more than four so this model cannot be run with DOE-2. You can generally simplify the model and combine plants, there is probably no circumstance where you need more than four independent hydronic chilled water/hot water loops in a building.

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When inputting interior surfaces there is a selection at the bottom of the input screen to describe the room that this surface is “Adjacent To”. Without this input, the software does not know what this surface is next to. In the Building Tree, navigate to the interior surface and at the bottom of the input screen, click on the Adjacent To button. Select another room in the list that appears.

Note that inputting interior surfaces between rooms that are in the same zone is not necessary. The only impact you will see from this feature is if you have interior surfaces that are between different zones.

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When doing compliance calculations, the software uses an engine developed by the CEC, the Compliance Manager. While the CEC’s published Joint Appendix 4 includes a very detailed list of assemblies as shown in EnergyPro, the CEC Compliance Manager does not implement the entire list.

The CEC recommendation is to open a copy of the Reference Appendices (Help | Title 24 | Reference Appendices), and find the U-factor for your proposed construction assembly in Joint Appendix 4 (also be sure to note the maximum U-factor from Section 150.0 of the standards). With that U-factor known, model a wood-framed assembly with a similar or slightly higher U-factor. Consider naming the construction to match what the builder will be constructing rather than what you modeled (e.g., call the R-30 wood-framed roof/ceiling with 0.032 U-factor that is substituting for your R-38, 0.031 U-factor, roof R-38 metal framed roofin case you use the file for a different job). Lastly, document for the plan checker what you did.

In the Building Tree, navigate to this surface, click on the Construction Assembly and either edit the current assembly by clicking on the green Import button or select another assembly from the library.

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The Compliance Manager issued by the CEC has strict requirements on the number of surfaces that must be input into a Zone. Without a minimum of 3 surfaces for Nonresidential or 6 surfaces for Residential, the Compliance Manager will not produce stable results. Also, each Zone will need to have a floor and ceiling/roof to run properly.

Many times the project may not have that many surfaces. One approach you can take is to divide a wall into two pieces and meet the criteria. Also, interior surfaces next to another Zone count towards the six surfaces on both the Zone it is in as well as the Zone it is adjacent to.

When inputting the surface areas, do not try to trick the software by inputting one square foot surfaces.  This will only result in the simulation failing to run.  It is imperative that you input realistic surface sizes for the Zone being modeled.

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The mandatory measures require that all heated slab floors must have slab edge insulation. A heated slab floor is a slab-on-grade assembly that has either electric or hydronic heating embedded in the slab. Refer to the Residential Compliance Manual for details on how this would be accomplished, along with insulation details.

In the Building Tree, navigate to the slab floor, and click on the Construction Assembly. You can now either select a different slab floor from the library, or edit the slab floor. To change this to a different selection, click on the green Import button and you will see two different lists of slab floors, Heated and Unheated.

If you select an Unheated Slab, the insulation is no longer required. If you select a Heated Slab, you must choose one from the list with a minimum insulation level that meets the requirements in the mandatory measures section of the code for your climate zone.

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When describing surfaces for a Zone, there will generally be four walls, and floor and a ceiling/roof. Looking at the geometry of these inputs, it would not be possible that any individual surface in that zone could be larger than all of the remaining surfaces. This indicates either an input error for the square footages, or there are surfaces that have not been included when describing the Zone, and the CEC Compliance Manager will not run.

Note that interior surfaces are included in this tabulation, so be sure interior surfaces in other zones have the “Adjacent To” set properly so this Zone includes that surface in the tabulation.

Check your inputs for this Zone and verify the correct square footages for each surface and make sure you have both floors and ceiling/roofs input.

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The prescriptive Title 24 requirements dictate that and spaces in a building that are greater than 5,000 sqft with ceiling heights greater than 15 feet must include skylights, along with automatic daylighting controls. Refer to the Nonresidential Compliance Manual for more information on this requirement. At the System level of the Building Tree, you have checked the box indicating that this system serves an area that meets these criteria, and hence must meet the minimum skylight and daylit area. At the Room level of the Building Tree, in the Lighting tab, the daylit area does not meet the requirements. If the system does not contain rooms that meet these criteria, uncheck the box at the system level of the tree. If there are rooms that meet these criteria, navigate to the Room level of the Building Tree, Lighting tab and enter the appropriate area of sidelit daylighting and skylit daylighting. These areas are determined according to the Nonresidential Compliance Manual.

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When inputting custom curve data points for a Heat Pump HVAC System, as the outdoor drybulb temperature decreases, the output of the heat pump should also decrease since the heat pump will have less capacity at lower temperatures.

Edit the data for the Central System on the Curves tab such that at lower temperatures, the system will have less output than at the higher temperatures.

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When inputting custom curve data points for a Heat Pump HVAC System, as the outdoor drybulb temperature decreases, the efficiency of the heat pump should also decrease since the heat pump will operate at lower efficiencies at lower temperatures.

Edit the data for the Central System on the Curves tab such that at lower temperatures, the system will have a higher kW input than at the higher temperatures.

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When inputting custom curve data points for a cooling System, as the outdoor drybulb temperature increases, the output of the heat pump should decrease since the cooling system will have less capacity at higher temperatures.

Edit the data for the Central System on the Curves tab such that at higher temperatures, the system will have less output than at the lower temperatures.

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When inputting custom curve data points for a cooling System, as the outdoor drybulb temperature increases, the efficiency of the cooling system should also decrease since the cooling system will operate at lower efficiencies at higher temperatures.

Edit the data for the Central System on the Curves tab such that at higher temperatures, the system will have a higher kW input than at the lower temperatures.

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When inputting custom curve data points for a cooling System, you must enter data for the cooling system that includes one data point 85F or below, and one point 115F or above.

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Modeling of heat pumps requires data be included for the system heating output at both the 47 and 17 degree AHRI outdoor design rating conditions. Manufacturers publish both sets of data in their literature, and this same data is also listed in the AHRI listing and sometimes in the CEC equipment directories.

In the Central System Library, in the Heating Tab, enter the Heating Output for the heat pump based upon both rating conditions.

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When a heat pump is input, the software requires that the heating capacity of the unit be given at two rating conditions.  The first rating condition is when the outside ambient drybulb is at 47 degrees F.  The second rating condition is when outside conditions are at 17 degrees F.  At both conditions, the manufacturer’s rated output needs to be input into the Central System Library entry for the heat pump.

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Variable Refrigerant Flow (VRF) system modeling includes describing both the outdoor condenser unit of the system as well as the indoor evaporator units at each of the zones. Each manufacturer places restrictions on how much indoor unit capacity can be coupled to a particular outdoor unit. EnergyPro will check how much indoor unit capacity has been specified and ensure that this falls within the acceptable limits of the VRF manufacturer.

You should review the VRF modeling guide at www.energysoft.com under the Support section of the website.

Verify the total capacity of each outdoor condenser unit that has been input at the System level of the building tree. Navigate to each Zone under that particular system, and verify the capacities of the indoor units that have been input at the Mechanical tab for the Zone. This total installed capacity of indoor units must fall within the parameters of the manufacturer.

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When inputting the efficiency of the HVAC system, ensure the value entered is consistent with the type of system being modeled. If it is small furnace, the value would be an AFUE that is in the range of 0.7 to 1.0, while a small heat pump would have an HSPF in the range of 7 to 12. Double check that you have entered this value correctly by selecting the HVAC system in the System level of the Building Tree and reviewing the inputs in the heating and cooling tabs.

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Cooling systems are described with two efficiency metrics, the Energy Efficiency Ratio (EER) and the Seasonal Energy Efficiency Ratio (SEER). Since the SEER represents the seasonal average performance across the cooling season, this value will be higher than the EER.

At the System level of the tree, select the HVAC system. In the Cooling tab, review your inputs for the SEER and the EER and ensure the SEER is higher than the EER.

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Each Zone entered into the Building Tree is required to have an Elevation entered for the Zone that describes the distance above the exterior grade of the building. Thus, a ground floor Zone with a slab on grade would have an elevation that is 0.7 feet above the exterior grade. Each floor of the building will require this value be input.

In addition, each Zone is required to have the Floor to Floor height entered that describes the distance from the Zone floor elevation to the Zone above floor elevation. If the Zone that is above another Zone does not have a floor elevation that is at least equal to the lower floor elevation plus the floor to floor height, this is an error.

At the Zone level of the Building Tree, navigate to the Building Story input.  Each unique level of the building (story) should have an entry.  Example, Floor 1, Floor2, etc.

Review the inputs for Floor Elevation and Floor to Floor Height for each Zone in the Building Story, and ensure these values have been input consistently.

Note that it is valid to have a single Zone that encompasses more that one floor of the building, you would simply select the lower story for that Zone.

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At the Zone level of the Building Tree, a Zone Terminal box has been input as well as the Heating and Cooling Airflow values.  The heating flowrate for this zone is lower than what is needed to provide the minimum code required ventilation for the zone.

At the Zone level of the Building Tree, in the Mechanical tab, compare the Heating Airflow input to the code required airflow reported in this message.  Note that while you may have chosen to input lower ventilation rates in the Room Occupancy tab, the code minimum specified by the CEC in the CBECC ACM manual tables will always be used as the minimum so you cannot go below this number.

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When modeling Zones, each surface in the Zone must have a unique name. This is a rule enforced by the CEC Compliance Manager. Note that when inputting names, only the first 25 characters that you input are considered, so ensure the names are reasonably short, and unique.

At the Building Level of the Tree, navigate to the surface and edit the name so that is it unique.

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Under the Distribution tab at the System level of the tree, you are given the option of selecting the location of the ductwork. When the location has been set to Attic, the CEC Compliance Manager requires that the total size of the attic must be at least 10% of the total square footage of the home. Without an attic of at least this size, there is insufficient space for the model to include the total volume of ductwork.

You have the option of changing the location of the ductwork by editing this input and selecting another location if your attic area does not meet this criteria.

If you think you have attic area that is 10% or more, navigate to each roof in the building tree. Review the area input for each roof. Also, click on the construction assembly and verify that you have selected a roof construction that includes an attic, and not a cathedral roof type construction.

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The Light Fixture you have selected has included an input below the fixture for a Control for Credit Lighting Power Density adjustment per Table 140.6-A in the Title 24 Standards. The control referenced is not valid for the type of occupancy selected for this Zone.

Please review the valid applications of this control in Standards Table 140.6-A and make sure you have selected a valid control. You can either change the control or change the occupancy at the Zone level of the tree.

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Under the Distribution tab at the System level of the tree, you are given the option of selecting the location of the ductwork. When the location has been set to Garage, the CEC Compliance Manager requires that you must have a Zone in the building tree input that has the Zone Type set to “Res Garage”.

You have the option of changing the location of the ductwork by editing this input and selecting another location if you don’t have a garage.

If you think you have input a garage, navigate to each Zone in the building tree. Review the Zone Type input for each Zone, one should be “Res Garage”.

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Under the Distribution tab at the System level of the tree, you are given the option of selecting the location of the ductwork. When the location has been set to Crawlspace, the CEC Compliance Manager requires that the total size of the crawlspace must be at least 15% of the total square footage of the home. Without a crawlspace of at least this size, there is insufficient space for the model to include the total volume of ductwork.

You have the option of changing the location of the ductwork by editing this input and selecting another location if your attic area does not meet this criteria.

If you think you have crawlspace area that is 15% or more, navigate to each exterior floor in the building tree. Review the area input for each floor. Also, click on the construction assembly and verify that you have selected a floor construction that includes a crawlspace.

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The Light Fixture you have selected has included an input below the fixture for a Lighting Power Density adjustment per the footnotes in Table 140.6-C in the Title 24 Standards. The footnote referenced is not valid for the type of occupancy selected for this Zone.

Please review the footnotes in Standards Table 140.6-C and make sure you have selected a valid adjustment. You can either change the footnote adjustment or change the occupancy at the Zone level of the tree.

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The HVAC System has been input with an Evaporatively Cooled Condenser, but the EER rating at 95 degrees for the unit has been input as being higher than the EER rating at 84 degrees. Since the EER84 rating is at 84 degrees and the EER95 rating is at 95 degrees, the EER84 rating should always be higher than the EER95 rating.

Either change the EER84 or EER95 rating so that the EER84 is higher than the EER95 rating.

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In the location listings, you have the option of selecting a location, and also you have the option of editing the location using the User Defined option. You have edited the location and you have not selected a valid DOE Climate Zone. In the Location Selection you must edit your Location and select a valid DOE Climate Zone. We suggest not using the User Defined feature, but rather that you select a stock location from the listings.

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Your HVAC System is marked as either New or Altered, but you do not have a New Mechanical System selected at the system level of the tree. An HVAC system is REQUIRED for the type of calculations you are performing.

In the System menu of the Building Tree, select a System from the Central Library.

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You have selected an HVAC System that is a Combined Hydronic System, which can only be modeled by the CEC CBECC engine if the heating boiler is not a Heat Pump. In this case you are using a Heat Pump for the boiler and this cannot be modeled.

Change your system type to a Non-Combined Hydronic system at the System level of the Tree, General tab, and model this as a Heat Pump.

At the Plant level of the tree, in the DHW Tab, model the DHW as a conventional Heat Pump Water heater.

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The current CEC CBECC engine will not allow you to set the fan CFM at zero (such as when modeling a radiant system).  You must enter a CFM for the Supply Fan on all HVAC Systems.

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All fans that are input into EnergyPro require a valid motor power rating (either input as the Brake Horsepower (BHP), the Nameplate Horsepower, or the Input Wattage).  This applies to any fans in which you have input a flow rate (CFM) in order for the CBECC Com engine to simulate the fan.

In the Central System Library, check the Fan tab for valid inputs for the Supply Fan and optionally the Return Fan.

In the Zonal System Library, check the Fan tab for any fan powered terminal boxes and equipment.

At the Zone level of the tree, check the Mechanical tab for valid inputs for the Exhaust Fan.

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When defining an HVAC system, it is a requirement of the CBECC Com calculation engine that ALL HVAC system must have a capacity entered for the system.  The software will not auto-size capacities, it is your responsibility to define this number.

At the Central System Library, edit the HVAC system and add a Heating and/or Cooling output for the HVAC system identified in this message.

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The Title 24 Standards mandate that any Nonresidential buildings with more than 1,000 sqft of Site Built Vertical fenestration cannot use the Center of Glass inputs in the fenestration description.

In the Fenestration Library, edit your inputs for the fenestration ratings and either use a Manufactured product, or use Defaults or NRFC rated values in the energy model.

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You have left the Floor Area for the room set to zero.  A Floor Area entry is required for all Rooms in the building tree.  If you double click on the Error this will take you to the Room in the Building Tree where you should enter a valid value greater than zero.

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When defining openings in a wall that include shading features (Overhangs or Sidefins) you must define the geometry of the Wall (Width and Height) as well as the geometry of the Windows and Doors (Width, Height) as well as the location of the opening on the Wall (XPos, YPos).  The XPos and YPos are the position of the bottom left corner of the Window or Door on the Wall.

If the Window/Door Height + the YPos exceeds the total wall height, the surface is located out of the boundary of the Wall.

If the Window/Door Width + the XPos exceeds the total wall width, the surface is located out of the boundary of the Wall.

Check your inputs for the wall dimensions, as well as your inputs for the Window/Door dimensions as well as the relative X/Y positions for validity.

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At the Zone level of the Building Tree, an input is provided for the Story of the building the Zone is assigned to.  In that list, each Story is required to have a unique name that describes the particular Story.  As an example, Floor 2 could be used to describe the second story of the building.

Each name in this list must be unique, duplicate names are not permitted.  Check this list and ensure each Story is assigned a unique name.

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The Floor to Floor Height for the Zone can never be less than the Ceiling Height. This Ceiling Height must always be less than the floor to floor height.

At the Zone level of the tree, in the Building Story input, either increase the Floor to Floor Height, or decrease the Ceiling Height.

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You are analyzing an Addition alone, and the Existing Floor Area is set to 0.  In the case of an Addition, the Existing Floor Area of the building must be entered.

Navigate to the top level of the Building Tree and enter the Existing Building Floor Area.

If you are not modeling an Addition alone, navigate to the top level of the tree, and change the Building Type.

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At the System level of the Building Tree, you have an HVAC system input with the “Outside Air From” setting configured to receive outside air from another HVAC system.  That other HVAC system has not been defined and must be properly configured for the simulation to run.

Select a valid HVAC system for your DOAS system from the Central System library.

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At the Zone level of the Building Tree, a Zone Terminal box has been input as well as the Heating and Cooling Airflow values.  The cooling flowrate for this zone is lower than what is needed to provide the minimum code required ventilation for the zone.

At the Zone level of the Building Tree, in the Mechanical tab, compare the Cooling Airflow input to the code required airflow reported in this message.  Note that while you may have chosen to input lower ventilation rates in the Room Occupancy tab, the code minimum specified by the CEC in the CBECC ACM manual tables will always be used as the minimum so you cannot go below this number.

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At the Zone level of the Building Tree, a Zone Terminal box has been input as well as the Heating and Cooling Airflow values, and the Minimum CFM Ratio for the Zone Terminal Box.  The Minimum turndown for this zone is lower than what is needed to provide the minimum code required ventilation for the zone.  The minimum turndown airflow rate is equal to the Cooling Airflow times the Minimum CFM Ratio input for the Zone Terminal Box.

At the Zone level of the Building Tree, in the Mechanical tab, compare the Cooling Airflow input and the Minimum CFM Ratio to the code required airflow reported in this message.  Note that while you may have chosen to input lower ventilation rates in the Room Occupancy tab, the code minimum specified by the CEC in the CBECC ACM manual tables will always be used as the minimum so you cannot go below this number.

Note that if you have checked the box for Demand Control Ventilation (DCV) your terminal box is allowed to turndown the airflow to 0.15 cfm/sqft and thus the minimum ventilation rate will be reduced in this case.

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When modeling a Domestic Hot Water system that includes recirculation pumps, the motor horsepower for the recirculation pump must be input.

At the Plant level of the Building Tree, in the Domestic Hot Water tab, this value will be input under the Pump Power input.

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The surface you have input has an area of zero which is not a valid surface and the simulation will not run.  You either need to edit the surface in the Building Tree and input a valid surface area, or you need to delete the surface from the Building Tree.

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At the system level of the tree, you have input one or more HVAC systems with an identical name.  The CEC CBECC engine uses the system name in the simulation and reports and requires that all systems in the building have a unique name.

Navigate to the System level of the Building Tree and edit the name shown.  Note that you do not need to edit the name in the Central System library, that name does not have to be unique.  Only the name shown in the Building Tree at the system level will need to be edited.

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You have input either a window or a skylight into the Building Tree.  In that entry, you have selected a Fenestration product from the Fenestration Library.  The fenestration selected is the wrong type.

Click on the Fenestration item in the building tree, this will take you into the Fenestration Library.  Review the entry for Fenestration Type, if this is a skylight, it needs to be set accordingly.  If it is a Vertical Fenestration product, ensure the appropriate selection is made.

Note that if you have both windows and skylights using the same fenestration entry, you will need to create two entries in the library, one for windows, another for skylights.

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You are modeling a Highrise Residential project and have failed to input the correct number of stories for this occupancy type.  Highrise residential projects are considered four stories or more.

At the Zone level of the tree, review each entry for the Floor Number input.  You must ensure that this is set to four or more.  If your project is in fact less than four floors, you need to change the Zone Occupancy input to Multi-Family and run the Res T24 Performance calculation instead.

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At each Zone is an input for the Number of Floors which determines how high the building is. The CEC CBECC engine will not allow this number to be greater than 3. While you might have a building that exceeds 3 stories this particular input cannot be greater than 3.

You may input more than one zone if you wish to model a building that is greater than 3 stories.

To correct this, go to the Zone and change this number to no more than 3.

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Large water heaters are required to have tank insulation per the Title 24 code. You have left this entry set to zero. You must enter a valid insulation R-Value. Edit your water heater and change the insulation R-Value to a number greater than zero.

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The area of this surface is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.

This is not physically possible to have a single surface that is larger than half of all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance.

You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.

Either reduce the size of this surface, or increase the areas of other surfaces in the Zone.

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The total area of Interior walls which are adjacent to your Zone is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.

This is not physically possible to have a single surface that is larger than half of all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance.

You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.

Either reduce the size of this surface, or increase the areas of other surfaces in the Zone.

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The total area of Interior floors which are adjacent to your Zone is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.

This is not physically possible to have a single surface that is larger than half of all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance.

You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.

Either reduce the size of this surface, or increase the areas of other surfaces in the Zone.

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You have entered a Zone as unconditioned but the current CEC CBECC engine does not support modeling of unconditioned zones. You have the option of inputting spaces as Residential garages. This input is handled at the Zone level of the tree under Zone Type.

Either change the Zone Type to Conditioned or Res Garage, or remove this zone from the model.

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You have selected an HVAC system that is a multiple zone Variable Air Volume (VAV) system.  This type of system requires that you input the Zone Terminal Boxes for each zone served by the system.  If a zone does not have any terminal boxes, simply input a terminal box that is Constant Volume for the modeling.

To input the terminal box, go to the Zone level of the Building Tree, in the Mechanical tab you will select an appropriate Zonal System for the zone.

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The HVAC System you have selected is not a system type currently supported by the CEC CBECC engine. The CEC does not currently have this type of system implemented in the Compliance Manager but will be implementing it in an upcoming version.

For now, please select a different system type or just input a smaller system.

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You are modeling a VRF system, and since the VRF modeling is not approved by the CEC for Title 24 permit application, you cannot use the VRF system type in EnergyPro.  For Title 24 permit submittals, you must model the units as a series of minimum efficiency split system heat pumps.  Model all of the ‘indoor units’ as their own outdoor unit (in the Central System Library, and at the System level of the Tree) and the outdoor unit does not get modeled. The heating and cooling capacity, fan airflow and design power should all come from the indoor unit specs. Don’t model an outside air economizer in the outside tab. You can use the System Multiplier in the Building Tree if any of the units are identical.  The heating and cooling efficiencies would be the standard code minimum efficiencies.

3 Phase – 13 SEER, 11 EER, 7.7 HSPF

1 Phase – 14 SEER, 11.7 or 12.2 EER, 8.2 HSPF

Please also reference the Appliance Efficiency Standards for the standard efficiencies.

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You have input an Interior Surface that has a very large surface area. In this case, the interior surface are is larger than the sum of all other surfaces in the Zone it is adjacent to. This is not physically possible to have a single surface that is larger than all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance.

You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.

Either reduce the size of this surface, or increase the areas of other surfaces in the adjacent Zone.

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You have selected an HVAC System that is a Hydronic Heating System, which can only be modeled by the CEC CBECC engine if the heating boiler is Gas Fired (not a Heat Pump or Electric Resistance boiler). In this case you are using are not using a Gas Fired unit for the boiler and this cannot be modeled.

Either change your system type to a Non-Hydronic system at the System level of the Tree, General tab, or at the Plant level of the tree, Heating Hot Water Tab, select a Boiler that is Gas Fired.

The approach to model an Electric boiler that provides space heating is to treat it as an electric space heater, and indicate no ducts.

The approach to model a Heat Pump boiler that provides space heating is to treat it as a regular heat pump heater in the Central System Library and indicate no ducts.

 

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The project has been identified at the Top level of the Building Tree as a Addition Alone.  When analyzing this type of project, the HVAC system must either be defined as Existing or New.  You cannot select Altered.

If you wish to analyze the HVAC system as being Altered, you must input the entire Existing portion of the building into the building tree.  At the top level of the Building Tree, change the Building Type to Existing + Addition/Alteration.

Your other option is to go to the System level of the Building Tree and change the System Type to New or Existing.

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At the System level of the Building Tree, you have specified HVAC systems that include chilled water coils.  You have not input a chiller to serve these coils at the Plant level of the Building Tree.

Go to the Plant level of the Building Tree, and in the Chilled Water Tab, input the chiller and associated chilled water pumps for the HVAC system.

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You have defined equipment in this building that requires a boiler.  This could include hot water coils at the air handler, zone terminal box heating coils, or in the case of a water source heat pump, a condenser water loop that requires a boiler.  You are required to input a boiler and hot water pumps.

Go to the Plant level of the Building Tree, and in the Heating Hot Water Tab, input the boiler and associated hot water pumps for the HVAC system.

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When equipment is defined at the central plant such as Boilers, Chillers and Cooling Towers (including those used for Hydronic Heat Pumps) you must be sure to define the pump associated with that piece of equipment.

To correct this problem, go to the Plant Level of the Building Tree, and go into either the Heating Hot Water, Chilled Water or Hydronic tab and define the flow rate and horsepower for pumps associated with all equipment that has been input.

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When inputting Interior Surfaces, you have the ability to indicate the Zone that the surface is Adjacent To as part of the inputs.  Since different Zones can have different Floor Multipliers, the CBECC engine requires that the Zones on each side of the interior surface must have the same Floor Multiplier.

If you wish to change the Floor Multiplier, go to the Zone level of the Building Tree and click on the Building Story.  From there you can edit the Floor Multiplier.

Another option is to edit the Interior Surface and change the Adjacent To setting to be another Zone that has the same Floor Multiplier, or you could even set the surface as Adjacent To itself.

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You have defined equipment in this building that requires a cooling tower.  This could include water cooled chillers or in the case of a water source heat pump, a condenser water loop that requires a cooling tower.  You are required to input a cooling tower and condenser water pumps.

Go to the Plant level of the Building Tree, and in the Chilled Water tab (for chillers) or in the Hydronic tab (for water source heat pumps), input the cooling tower and associated condenser water pumps for the HVAC system.

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When inputting Underground Walls, the CBECC Res engine will only allow a wall construction assembly which is either Concrete, Insulated Concrete Form (ICF) or Brick.  For Underground Walls, you must select a construction assembly from the library which is one of these types, you cannot use conventional frame walls, etc.

In the Building Tree, you must either select a different construction assembly that fits this description, or edit the construction assembly you have selected, hit the green Import button and import either a Concrete, ICF or Brick wall from the JA4 selections.

It is acceptable to add framing and insulation to the concrete wall once selected, however, in the Res T24 Perf tab.

 

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Warnings (23)

When modeling a single family project, the number of bedrooms is input at the Zone level of the Building Tree, Dwelling units tab.  Each Zone can have bedrooms input.  Double check the total number and ensure this is correct.  Note this is a warning, so it is acceptable to have a large number of bedrooms.

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Title 24 Section 140.4 specifies the design conditions to be used in the load calculations when doing Prescriptive compliance calculations.  You have chosen to change those design conditions to a different criteria than what is specified in the code.  Click on the Calculations, bottom left and you will see the list of calculations appear in the list above.  Select Loads from the list and on the right you will see the Options.  The Options should be set as follows:

Winter Design Conditions:  Median of Extremes

Summer Design Conditions: 0.5%

Mean Coincident Wetbulb

Ignore Design Day for Schedules.

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At the Zone level of the Building Tree, Lighting tab, we offer the option to “Override” the Lighting Power Density (LPD) for a Zone (ie to input your own LPD instead of listing the fixtures).  Taking this approach when doing Prescriptive compliance is not appropriate since Prescriptive requires you to document the installed lighting fixtures, not just indicate the LPD.  The Use Installed LPD option should be selected, and the actual light fixtures should be input into the Room level of the Building Tree.

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Your Zone Lighting Power Density (LPD) is zero.  This may be because you forgot to input light fixtures into the room, or you deliberately set the value to zero.  However, the CEC CBECC engine is designed to automatically assign a Standard LPD to any Zones with no lighting.  Check your inputs at the Zone level of the Building Tree, Lighting tab for correct inputs.  Verify the Rooms have light fixtures added.

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It is acceptable to have a Ceiling Height less than 7 feet or greater than 20 feet for a Zone, but this is reported as a warning to ensure you have not made an input mistake.  At the Zone level of the Building Tree, click on the Building Story button and verify the correct input for Ceiling Height.

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The normal Occupancy Density for a Zone is set based upon the Occupancy Type selected in the General tab of the Zone.  Based upon the California Building Code (CBC) this then determines how many people will be in a space.  While it is acceptable to deviate from this number for non-Title 24 calculation purposes, for Title 24 purposes this input will be ignored and the CBC value will be used.

This value can be changed at the Room level of the Building Tree, Occupant tab.

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Section 120.1 of the Title 24 Standards dictates the ventilation rate (cfm/person) for a particular occupancy.  At the Room level of the Building Tree, Occupant tab, your input for the ventilation rate is lower than the value in the Standards.  While this is acceptable for non-Title 24 purposes, this input will be ignored for Title 24 purposes and the value from the Standards will be used.

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The selected New Construction Assembly is a certain type (Wall, Slab, Roof, Door) but you have it selected incorrectly.  For instance, you may have selected this assembly in the tree under the Slab On Grade entry, then modified the type in the library to be a raised floor.  Click on the Libraries selection at the bottom left, select the assembly in the Assembly Library and change the type by using the green Import button and selecting the correct type.

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The selected Existing Construction Assembly is a certain type (Wall, Slab, Roof, Door) but you have it selected incorrectly.  For instance, you may have selected this assembly in the tree under the Slab On Grade entry, then modified the type in the library to be a raised floor.  Click on the Libraries selection at the bottom left, select the assembly in the Assembly Library and change the type by using the green Import button and selecting the correct type.

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Prescriptive compliance specifies things like maximum U-Factors for walls, roofs, floors and windows, as well as maximum Solar Heat Gain Coefficient values and minimum Visible Transmittance values.  Please review Section 140.3 for Nonresidential Buildings, and Section 150.2 for Residential Buildings on the code requirements and correct this feature in the inputs.

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Prescriptive compliance specifies a maximum U-Factor (rate of heat loss) for opaque surfaces including Walls, Roofs and Floors.  You must thermally improve this component by adding more insulation to the construction assembly.  In the Construction Assembly Editor, select the JA4 tab and either Import a better assembly, or add additional Interior or Exterior Insulation to the assembly.

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Based upon the Climate Zone of this home, the simplified Prescriptive compliance approach requires the installation of a Cool Roof for the new roof in the addition.  The roof must have a minimum Solar Reflectance as outlined in Section 150.1.  At the Construction Assembly editor, check the box for CRRC-1 Roof and enter a Solar Reflectance for the roofing product.

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Based upon the Climate Zone of this home, the simplified Prescriptive compliance approach requires the installation of a Cool Roof for the new roof in the addition.  The roof must have a minimum Thermal Emittance of 0.75.  At the Construction Assembly editor, check the box for CRRC-1 Roof and enter a Thermal Emittance of 0.75 or above.

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Based upon the Climate Zone of this home, the simplified Prescriptive compliance approach requires the installation of an Attic Radiant Barrier for the new attic in the addition.  At the Construction Assembly editor, check the box for Radiant Barrier in Attic to indicate this feature.

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The simplified Prescriptive compliance approach for additions is limited to additions that are 1,000 sqft or less.  For additions larger, you will be required to use the Performance approach, since this addition will required HERS registration and testing for the IAQ fans, and possibly other measures.  Under the Calculations, select the NR T24 Performance for your calculation.

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Modifications to the HVAC system that involve replacing the system or components require that the project be registered with a HERS provided.  The simplified Addition and Alteration methods allow for no registration, and as such cannot be used in this case.  Your options would be to use the Performance Approach (which will still required registration) or indicate the HVAC is not being altered, and then submit a separate document via a HERS provider (see www.cheers2016.org) for the HVAC alterations in addition to the envelope documents prepared in EnergyPro.

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Modifications to the HVAC duct system that either involve altering the existing ducts, or extending the ducts more than 40 feet require that the project be registered with a HERS provided.  The simplified Addition and Alteration methods allow for no registration, and as such cannot be used in this case.  Your options would be to use the Performance Approach (which will still required registration) or indicate the ducts are not being altered, and then submit a separate document via a HERS provider (see www.cheers2016.org) for the duct alterations in addition to the envelope documents prepared in EnergyPro.

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The residential Prescriptive compliance rules for alterations limits the window area to 20% of the floor area when your alteration includes an increase of more than 75 sqft of window.  You can either decrease your new window area (altered windows do not count) or use the performance approach for the alteration calculation.

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When doing an addition over 700 sqft or a new home, Prescriptive compliance requires all roofs have and attic and a radiant barrier.  If your roof has no attic, you must use the Performance Approach for compliance.  At the Construction Assembly editor, edit the roof assembly to include an attic.

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Title 24 requires the installation of a High Performance Attic as describe in Section 150.1 of the Standards.  You need to add either R-6 (tile roof) or R-8 (other roofs) for the exterior insulation, or R-13 (tile roof) or R-18 (other roofs) for the interior insulation in the JA4 tab of the construction assembly editor.  In addition, you must have the cavity insulation at R-38 or higher.

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When doing a simulation with the EnergyPlus based CBECC engine, the software generally expects that the airflow rate on the cooling system be within a certain range.  The valid range for a successful simulation is going to be a cooling system that has a cfm airflow to tonnage ratio between 300 and 450 cfm per ton.

Review the Cooling output of the system and the airflow rate of the system for conformance with this rule in the Central System library.  Either change the cooling output (tonnage) or the airflow rate (CFM) to ensure the system falls within this range should the simulation fail to run.

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When an Overhang or Sidefin has been specified on a window in a given wall, it is a requirement that a complete set of inputs for the wall, and all surfaces in that wall (windows and doors) be provided.

Inputs needed for the walls, windows and doors include the Area of the surface and the Width and Height of the surface.  The Width and Height must equal the Area of the surface.

In addition, each window and door must include an X and Y input describing the location of the bottom left corner of the surface relative to the bottom left corner of the wall as viewed from the outside.

Note that when describing the X and Y positions, it is important to ensure that no two surfaces on that wall overlap each other.

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When an Overhang or Sidefin has been specified on a window in a given wall, it is a requirement that a complete set of inputs for the wall, and all surfaces in that wall (windows and doors) be provided.

Inputs needed for the walls, windows and doors include the Area of the surface and the Width and Height of the surface.  The Width and Height must equal the Area of the surface.

In addition, each window and door must include an X and Y input describing the location of the bottom left corner of the surface relative to the bottom left corner of the wall as viewed from the outside.

Note that when describing the X and Y positions, it is important to ensure that no two surfaces on that wall overlap each other.

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