[Equest-users] Overcooling

[Michael Hardy]

It's possible that you are ok, but a lot of variables need to be aligned.

 

The building location (climate/exposures), use, occupancy schedule and
ventilation rates all play a big part in determining whether the shortcut is
valid.  I don't usually have that much good luck.

 

The big variable is whether you will actually need reheat and what is
driving the need for reheat.  If you've determined you will need reheat then
the simplification will usually underestimate the amount of cooling and
airflow required, since the model will only return the average cooling load
instead of the overcooling/reheat that occurs in some of the zones.  The
degree of this underestimate will depend on the variables mentioned earlier
and how the space ends up being zoned.

 

Michael Hardy, PE, F.NSPE
Black Oak Engineering, Inc.
Cell 503.314.5244 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Gajewski,
David
Sent: Monday, August 30, 2010 11:54 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Overcooling

 

I have modeled a building with DX rooftop units.  In an effort to save time,
I have zoned the building per rooftop.  Am I creating a problem by having
only one zone per rooftop if I designate that rooftop as a VAV system
without reheat?  I am cooling often down to 64-65 degrees when I have a
setpoint of 70.  

 

Thanks,

David

 

David Gajewski, CEM
Energy Solutions Division
Murphy Company
( Direct:  (314) 692-1541
( Mobile:  (314) 220-4281
( Main:  (314) 997-6600
Web:  www.murphynet.com <http://www.murphynet.com/>  

 

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