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NC-2009 EAp2:Minimum Energy Performance

Conditioned spaces - Heated & Cooled??

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Maya Karkour
EcoConsulting
LEEDuser Basic Member
549 thumbs up

Dear all, Appendix G states the following: "All conditioned spaces in the proposed design shall be simulated as being both heated and cooled even if no heating or cooling system is to be installed" 1) So if I am modelling a building in a cold climate area where only heating is required, do I still need to model cooling? I find it really strange! 2) What about areas with mechanical ventilation only (such as underground parking with no cooling / heating)? Do these have to be modelled as cooled & heated, or those do not classify as conditioned? I appreciate if someone knows the "logic" behind this - just for my own interest! Thanks,

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Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Tue, 09/18/2012 - 14:28

If the ventilated space is using non-conditioned air, then it is not a conditioned space, right? So this means it does not need a heating and cooling system. But each space that has heating or cooling IS conditioned and must also have heating AND cooling...
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 09/18/2012 - 15:27

Regarding modeling cooling - yes Appendix G requires this and it is kinda strange. The rational I have heard is that any space can add cooling in the future even if it is not in the original design. There is a common work around for this requirement - set the temperature in the space during the cooling season so high that the system never operates. This is allowed as the temperature setting is not dictated by 90.1 (just don't try and claim the thermal comfort credit!). The reviewers understand this work around and usually will not make you model cooling in these spaces as an academic exercise. We would just explain that we understand the work around and in our opinion it is not productive to spend the time to model cooling. As a reviewer I let this slide all the time.

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