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

SF used for energy model vs. building GSF

Our building energy model s.f.(table eap2-1) 74,000+/- does not match the gross building s.f. reported in 1.1A 94,000+/-. The difference is approximately 20,000 s.f. and is due to wall thickness and chases in a 4 level builidng. The LEED reviewer is stating that the two s.f. numbers must match - is there guidance in the LEED credit or ASHRAE 90.1 that indicates how this s.f. must be treated?

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Mon, 10/22/2012 - 23:36

A gross to net difference of over 20% is extremely high. Normal range is under 10%. The energy model should be modeling gross sf overall and net for things like lighting. If your project does indeed have such a difference I would suggest you provide a detailed narrative explaining it, show your calculations and perhaps even provide drawings to back up your claim.

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