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NC-2009 EAc1:Optimize Energy Performance

U-factor residential/nonresidential

I’m modeling a hotel (5 storey, one floor is underground) in which there are also offices, a coffee bar, a wellness center... I read that “hotel/motel guest rooms” are among the residential spaces. Definition of “residential”: "spaces in buildings used primarily for living and sleeping. Residential spaces include (..) hotel/motel guest rooms". In the baseline model shall all the envelope components have the U-factor relative to “residential” (Tab. 5.5), since the rooms are the primary use? Even in the wellness center or in the offices? Best Regards

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Tue, 07/10/2012 - 20:54

Technically you are supposed to model the residential spaces with the residential requirements and the non-residential with those requirements. If the wall area of the non-residential is very small (less than 5%) you don't have to model the non-residential spaces separately.

Wed, 07/11/2012 - 09:05

Thank you, Marcus. Is the limit of 5% a recommendation of ASHRAE 90.1?

Wed, 07/11/2012 - 21:23

Table G3.1-5 Proposed Exception a.

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