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?

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

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

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

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

Our project has a diesel backup generator. Should we include it in our energy model?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

GLASS CURTAINWALL

Hello! I would like to know from those who have worked with curtain walls, which U value do you take from ASHRAE for the baseline of the project. I'm almost sure it's no treated as a window (I read the comments below) but instead how is it going to be treated ? I'm working in a 3A zone. Thank you very much in advance!

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Wed, 01/16/2013 - 04:56

METAL FRAMING..............

Wed, 01/16/2013 - 14:40

It is treated as a window. Make sure you select metal framing (storefront/curtain wall) and not Metal Framing (all others). The later would be for metal framed windows that are not storefront or curtain wall. Many projects with curtain wall will also have more standard windows and in this case your baseline should have two different window performance values.

Mon, 01/21/2013 - 15:21

The problem to choose the accurate type of window or wall is that the glazing account for more than 40%, in the ASHRAE guide for windows/curtain walls specifies that glazing should account between 0% to 40%. I have seen projects which have almost 100% glazing and have been certified by LEED but I do not know how to treat glazing that accounts for more than 40%. Thank you!

Mon, 01/21/2013 - 17:51

Model the Proposed as designed. Model the Baseline according to Table G3.1-5 Baseline (c). The Baseline will be limited to 40% window to wall ratio. Basically in many climates you will pay a penalty for going over 40%.

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