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NC-2009 EAp2:Minimum Energy Performance

System #7 for undesigned space

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Erika Duran
Sustainability Consultant
Dagher Engineering
LEEDuser Basic Member
51 thumbs up

I am working on a residential building, with more than 20,000 SF of conditioned non residential spaces, so I am using System #7 for non residential spaces. I also have spaces with no HVAC system designed yet (spaces that shall be rented/leased). 90.1-2007 calls for each floor to be modeled with separate HVAC system for systems 5,6,7,8. Do I include my rented/leased spaces under the same VAV system that serves the rest of the floor, or should I create separate HVAC systems for these spaces? Also, does the one-system-per-floor rule apply if I have some single height spaces and some double height spaces on the same floor?

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

Thu, 01/17/2013 - 21:44

Model it as part of the same per floor baseline system. The trickier part sometimes is having to model this system in the Proposed for those spaces as well. The rule applies. It is per floor not per height or volume.
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Erika Duran
Sustainability Consultant
Dagher Engineering
LEEDuser Basic Member
51 thumbs up

Fri, 01/18/2013 - 14:28

Thank you, Marcus. I had another unrelated question - in one of my projects, the LEED reviewer mentioned that I am allowed to use Systems #9 or #10 from 90.1-2010 for spaces with heating only. I want to apply these systems now on a different project. Is there any LEED CIR or ruling that allows use of these two systems for LEED 2009? I know these systems are also included in 90.1-2007 addenda, but LEED Reference Guide mentions using 90.1-2007 with errata but without addenda.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 01/18/2013 - 15:13

I would have to go digging through the Interpretations, Reference Guide Addenda, etc. to try and find it. Don't know where it is off the top of my head. I can tell you that the reviewers allow the application of addenda to 2007.
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Amy Boyce
Manager, LEED
USGBC
LEEDuser Premium Member
26 thumbs up

Fri, 01/18/2013 - 15:35

The interpretation you are looking for is #10130. In general, projects are always allowed to apply addenda, they are just not required to. If a particular addendum is applied, all aspects of it must be applied; projects cannot pick and choose within one addendum, though they are not obligated to use all addenda.

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