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

ASHRAE 90.1-2007 vs 90.1-2010

Has anyone compared ASHRAE 90.1-2007 vs 90.1-2010 to see, if you get the same points in EAc1 or do you get less points? In other words, will it be more difficult to get points in LEEDv4, when 90.1-2010 must be used?

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Fri, 09/06/2013 - 12:07

ASHRAE Journal - May 2013, Figure 1, pg. 38 "A Stable Whole Building Performance Method for Standard 90.1" by Michael Rosenberg Accourding to Mike, it's going to get much harder. 30% ENERGY savings with 2007 will get you roughly 14% with 2010.

Mon, 09/09/2013 - 13:51

US DOE evaluates the relative stringency of each version of 90.1 relative to the previous one. Here is the link to their determination - http://www.energycodes.gov/regulations/determinations

Wed, 01/31/2018 - 20:31

Marcus - I need a single number showing the difference between ASHRAE 90.1 2007 & 2010, in ASHRAE Journal, Micheal Rosenberg identifying 16% gap as Jean mentioned in the first comment but there is supporting quantitative document for ASHRAE 90.1 2010 showing the gap for different building types and for instance, mid rise residential has 6.98% which is way lower than other building types, please advice.

Mon, 02/05/2018 - 18:26

Looks like 18.2%. https://www.energycodes.gov/ansiashraeies-standard-901-2010-final-determination-quantitative-analysis 

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