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CI-2009 EAp2:Minimum Energy Performance

ashrae 90.1 2007 - space type

The selling area of a retail commercial interior project will be a conditioned space located over a parking area whose height is half under sidewalk level and half above it. This happens on 2 of the 4 sides of the place. There will be a also metallic curtain for the parking access. Openings including parking garage access are about 25% of this space. Considering the openings DO NOT have operable windows, should we call this place unconditioned space or should it be considered and treated as exterior?

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

Mon, 10/08/2012 - 14:22

Sounds like unconditioned space to me. See the definition of unconditioned space in 90.1.

Tue, 10/09/2012 - 14:39

Thanks Marcus for your reply Checking 90.1 the definition of unconditioned space talks about enclosed space and indicates that parking garages with natural or mechanical ventilation are not considered unconditioned spaces. Also cheking the definition of enclosed space I find that it talks about operable windows that we don't have in this case...
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 10/09/2012 - 16:04

Sorry I meant to say - Sounds like it is not an unconditioned space to me. So it is not a space at all and is considered as the exterior.

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