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NC-2009 EAp2:Minimum Energy Performance

G3.1.1. Additional system types for nonpredominant conditions

We’ve got a comment for a hotel project that “secondary HVAC systems should be specified in the Baseline building if any of the exception(s) from G3.1.1 are applicable. The non-residential portion of the building appears to be greater than 20,000 square feet and some of the areas of the building are on a different schedule than the hotel.” In that case, where the project may fall under case (a) of G3.1.1, which system type should the additional system types for non-predominant conditions conform to? Thank you!

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Mon, 01/16/2017 - 15:32

Subtract the residential area (hotel) from the total area. Use the remaining area to reenter Table G3.1.1A.

Wed, 01/25/2017 - 13:43

Thank you Marcus. However, our hotel building consists of 12 floors (in total, including the residential uses) and apparently non-residential spaces are less that 25,000 sf. (including three different types - mechanical, offices, restaurants). According to table G3.1.1A should we select our additional system based on area only or consider the amount of floors as well? On the one hand we should use System 4 (which would make sense) and on the on the other we should use System 8 which is very complicated for spaces of insignificant size.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 01/25/2017 - 14:32

If you subtract off the residential floors then how many are left?

Wed, 01/25/2017 - 14:43

4 floors are left!
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 01/25/2017 - 15:51

So it looks like a system #6.

Thu, 02/02/2017 - 10:34

Thanks Marcus!

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