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

[Jeff Ross-Bain]

Thank you very much for your thoughts. This is very helpful.

 

Regards -

 

Jeff Ross-Bain, PE, LEED AP BD+C
Principal

404-220-8940 Office

404-220-8955 Direct

www.rbgb.com <http://www.rbgb.com/> 

Build Green. Save Time

 

From: Rob Hudson [mailto:rdh4176 at gmail.com] 
Sent: Thursday, March 15, 2012 7:26 AM
To: James Hess
Cc: Jeff Ross-Bain; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Modeling a non-existing cooling system

 

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 <tel:%28501%29%20351-4667> 

 

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/> 

Build Green. Save Time


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-- 
Rob Hudson

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