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NC-2009 EAp2:Minimum Energy Performance

Envelop Exterior /Interior Walls

Hello everyone,

 Thanks in advance for your help! I understand that generally interior partition walls are not usually modeled, however I'd like some clarification this case. On the N and E orientations of our project, exterior walls  assemblies are as follows:

(A) precast concrete elevation panels that are (L1):3" EXTERIOR CONCRETE ; (L2):3" EXTERIOR AIR FILM; (L3):3" INSULATION; (L4):INTERIOR AIR FILM ; (L5):3" INTERIOR CONCRETE

(B) Subsequent, the above is followed by  6"-12" AIR CAVITY; 8" CMU , metal stud cavity wall construction, followed by ans interior sheetrock. 

Question is, do I need to model both A and B and the contraction assembly of the exterior envelop?  I am assuming that the zone between A&B is adiabatic (no heat flow very little), so generally do not explicitly model interior partition walls.

Please advise .

 

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 02/25/2019 - 17:39

Yes you need to model that interior wall. It has considerable thermal mass and that will impact the energy use. Since it is an exterior wall it is also not adiabatic. 

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