FAQs about EAp2 :

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?

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

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?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Baseline envelope - Existing Buildings (Retrofit)

Hello, I would like to ask if anyone has a comment on two questions regarding the baseline model for existing buildings: 1) According to Table 3.1 from Appendix G, thermal loads due to occupancy and equipment as well as all schedules should be the same for both Baseline and Proposed models. I concluded that the disposal of the interior areas should be common to both models (eg same areas for restrooms and offices). Question: Should I use the proposed model to define the indoor areas distribution and replicate in baseline? 2) My existing building (before retrofit) have outside shading (brises) and there is the intention to keep this device in the new project. In accordance with G3.5.1 table: "f. Existing Buildings: For existing buildings envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated" But the same table says I should model the baseline with no shading devices: "5.5-1- through 5.5-8: All vertical glazing shall be assumed to be flush with the exterior wall, and no shading projections shall be modeled..." Question: Should I ignore this last quote and include shadowing devices in the baseline model? Further on, I contacted ASHRAE as well, and they answered me that I should look to 2013 version in order to clarify my doubt of version 2007. According toTable G.3.15: "d. Vertical Fenestration Assemblies. Fenestration for new buildings, existing buildings, and additions shall comply with the following: - Fenestration U-factores shall match the appropriate requirements..." - Fenestration SHGCs shall match the appropriate... ALL VERTICAL FENESTRATION SHALL BE ASSUMED TO BE FLUSH WITH THE EXTERIOR WALL, AND NO SHADING PROJECTIONS SHALL BE MODELED"

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Fri, 10/10/2014 - 20:48

1. Yes the interior areas should be the same. 2. Model the baseline without any external shading. Table G3.1-5 Baseline (f) only applies to the envelop which includes insulation and windows, not external shading.

Mon, 07/15/2019 - 21:34

From the User Manual (which I recommend having since it explains a lot of things that might seems obscure or random):
Overhangs and Other Shading Projections 
The baseline building design is assumed to have glazing that is flush with the outside surface of the exterior wall surface. This means that the building performance rating method gives shading credit for window recesses, overhangs, side fins, or other permanent shading devices that reduce solar gains on the glazing, including self shading from the building itself. The baseline building is also assumed to have no interior shading devices, such as mini-blinds or curtains. However, the proposed building may be modeled with interior or exterior shading devices as long as they are automatically controlled. 

Tue, 07/16/2019 - 20:53

It can if the curtain wall is not already flush with the wall.

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