FAQs about EAp2 :

Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

Can SHGC be higher in the proposed than in the baseline model?

Our process load is higher than 25%. Do we have to justify that?

Do I need to justify the electrical and fuel rates I am using in my model?

Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

Can I claim exterior lighting savings for canopy lighting even though a baseline model cannot include shading elements?

The project is built on a site with existing exterior lighting installed. How should this be accounted for?

Can mezzanines open to floors below be excluded from the energy model?

How do I provide a zip code for an international location?

For a project outside the U.S., how do I determine the climate zone?

For a project outside the U.S., how do I determine the Target Finder score?

Do hotel rooms need automatic light shut-off control?

How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?

The Section 9 space-by-space method does not include residential space types. What should I use?

Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

Can the Trace 700 'LEED Energy Performance Summary Report' by uploaded to LEED Online in lieu of the Section 1.4 tables spreadsheet?

A portion of our building envelope is historic. Can we exclude it from our model?

Which baseline HVAC system do I use if my building has no heating or air conditioning?

For an existing building, do I need to rotate the model?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Return Fan included in Baseline Fan Power Calc?

Another question regarding the baseline fan power calculation in the Tables 1.4 Excel spreadsheet: Does the calculation account for the possibility of a Return Fan in the proposed system? If not, is there a way to credit that or does the proposed building always take a hit with powered exhaust and return fan energy? Thanks!

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Tue, 09/10/2013 - 18:38

All of the fans are included in the Baseline fan power calculation. This is done independent of the proposed system fans. So there is no penalty per se.

Tue, 09/10/2013 - 18:49

Ok, so basically the baseline "supply fan" power calculation accounts for the possibility of a return or powered exhaust fan, regardless of it actually existing? I just want to be sure I'm not supposed to do a second baseline fan calculation for the return fan if the proposed system has a return fan.

Tue, 09/10/2013 - 19:39

G3.1.2.9 calculates the total baseline fan power allowance. This includes any supply, return, exhaust and relief fans associated with the baseline system. Keep in mind that the baseline never actually gets designed and does not exist at all except in the model. You are not supposed to do a second calculation for the return fan as this would double count the fan power and overstate the baseline energy use.

Tue, 09/10/2013 - 19:48

Ok, got it. Thanks!

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