[Equest-users] Modeling a non-existing cooling system

[James Hess]

I believe you have to include the cooling system in the model (per ASHRAE), but with the cooling thermostat set-point set high (i.e. up to 90 degrees), per USGBC, which effectively makes this a moot point.  Is the cooling system in the model?  Yes, we met the modeling requirement.  Does it have any impact on the savings?  The answer would be no.

That is how I would handle this situation.

I have seen this written down somewhere, maybe a USGBC interpretation, just cannot remember where I saw this.

Regards,

JAH

James A. Hess, PE, CEM, BEMP
Energy Engineer
TME, Inc.
Little Rock, AR
Mobile: (501) 351-4667

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jeff Ross-Bain
Sent: Friday, March 09, 2012 1:59 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modeling a non-existing cooling system

Hi All,

>From my understanding of ASHRAE 90.1 Appendix G Table G3.1 (10) and the User's Manual, if a space has no cooling system, and it is a conditioned space (i.e. NOT semiheated), then that space must have a cooling system modeled and it would be identical for the proposed and baseline cases. I completely understand the logic of this requirement - in most cases.

However, I am working on a fire station where the apparatus bay (the fire trucks) are in a 4,000+ sq ft space that is heated only, but is a conditioned space and not a semiheated space. This space is almost half of the building area, will not be cooled, has large overhead doors that are mostly open, and is a place where diesel engines run.

Does anyone out there know of any exception, or interpretation, to this modeling rule for specific cases such as a fire station where a space can be modeled as heated only for the baseline and proposed cases? The model will be submitted for LEED review. I can certainly model a cooling system but it does not seem to make sense in this case.

Thanks for your input and I really appreciate this forum.

Cheers!

Jeff Ross-Bain, PE, LEED AP BD+C
Principal
404-220-8940 Office
404-220-8955 Direct
www.rbgb.com<http://www.rbgb.com/>

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