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

EAp1 Review

Hello we´ve submitted a project to review in which we have no conditioned spaces in the proposed case but we modelled the HVAC system the same way in baseline and proposed cases since we dont comply with the criteria for non-conditioned spaces these is the review comment we got: 1. It appears from the narrative provided under PIf4 (Schedules and Overview documents) that no HVAC systems except for ventilation fans are provided for the project building and therefore the building spaces meeting the criteria for un-conditioned space. As per the ASHRAE 90.1-2007 Users Manual, unconditioned space is not cooled and has a heating system smaller than 3.4 Btu/h#sq.ft. Note that for unconditioned spaces, the envelop does not necessarily need to be modeled, but the electric loads from the lighting and fans shall be included in the energy calculations per LEED Interpretation 2028 dated 1/29/2008. I don´t know if they´re telling us not to model any HVAC systems or that we have to install one if we dont comply with the criteria.

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Mon, 10/21/2013 - 18:22

If the space is unconditioned (i.e. meets the definition they state) you do not have to model heating or cooling equipment. It is only if you have one or the other that you need to model the one you do not have.

Tue, 10/22/2013 - 18:02

The spaces in the model have a range of 30-50 Btu/hsf does this means I have to model both heating and cooling in my model or do I have to install the equipment physically in the building and model it?

Wed, 10/23/2013 - 16:01

The 3.4 refers to the heating system capacity. Since you have no heating system your capacity is less than 3.4 and you do not need to model heating or cooling. Your space is unconditioned.

Wed, 10/23/2013 - 21:09

Thanks a lot Marcus you´ve been really helpful..

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