[Bldg-sim] Appendix G: Cooled space?

[Julia Beabout]

There definitely seems to be some variability out there on how it's handled.
There are several LEED CIRs posted on the LEED website for situations that seem similar to this.  My take on it is that if you are only ventilating the spaces, the ventilation fans don't need to be counted as a cooling system; thus, you do not need to model a cooling system for these spaces.  However, the fan energy does need to be accounted for in both the  proposed and baseline models.  So, they basically become energy neutral in the models and/or are treated kind of like a process energy load.
If others have a different interpretations, I'd appreciate hearing the feedback.
Julia


----- Original Message ----
From: Kevin Kyte <kkyte at robsonwoese.com>
To: "Chatfield, Gary" <Gary.Chatfield at lv.fk.com>; "Howe, Timothy" <Timothy.Howe at stantec.com>; bldg-sim at lists.onebuilding.org
Sent: Tuesday, July 1, 2008 11:40:53 AM
Subject: Re: [Bldg-sim] Appendix G: Cooled space?


Did anyone come up with an answer for this?  I have a similar situation.  My thought would be that it should be considered a cooling system.
 
Kevin Kyte, EIT, LEED AP
RobsonWoese, Inc.
(T) 716-636-1800
(F) 716-636-1856
http://robsonwoese.com
 
From:bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chatfield, Gary
Sent: Monday, June 30, 2008 12:04 PM
To: Howe, Timothy; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Appendix G: Cooled space?
 
Tim
 
My thoughts on this would be that your main system should be sized to provide the fresh air at your cooling temperature to replace the air rejected by the exhaust, and you will probably find this is happening unless your space is negatively pressurized.
 
Gary Chatfield
LEED® AP
FLACK+KURTZ
385 Pilot Road, Suite D.  Las Vegas, NV 89119
Main:    702.897.8181
Direct:  702.352.9562
Fax:    702.914.6966
gary.chatfield at lv.fk.com

________________________________

From:bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Howe, Timothy
Sent: Thursday, June 26, 2008 6:47 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Appendix G: Cooled space?
 
I have a mechanical room that is conditioned to 95 in cooling through exhaust fans and heated to 65 with unit heaters.
 
Do the exhaust fans constitute as a cooling system?  The system would need to provide a sensible capacity of 5 btu/h*ft2 for the mech room to be considered to be a cooled space, which I have not yet calculated.
 
The reason I as is that if these exhaust fans are not considered a cooling system then the baseline cooling system will need to be modeled to complete an accurate LEED model.
 
Any suggestions?
 
Tim.
 
Timothy Howe, MS, LEED® AP
Mechanical Engineer
Stantec
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