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

Rob Hudson rdh4176 at gmail.com
Thu Mar 15 04:25:35 PDT 2012


As long as the cooling thermostat setpoints are identical in both models,
USGBC should approve of it.  We have done this on numerous projects for
small storage spaces and stairwells.

Rob

On Wed, Mar 14, 2012 at 6:14 PM, James Hess <JHess at tmecorp.com> wrote:

>  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*
>
> Build Green. Save Time**
>
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-- 
Rob Hudson
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