[Equest-users] Large Auxiliary Energy Use

[Eddie Corwin]

I can not say for sure, but it could have to do with the way your chilled water 
loop is controlled.  If it is set to standby, the chiller will idle when it is 
not in use. That , with a bad performance curve could possibly give you this 
problem.  I would try setting the loop to Demand, or put it on 
a temperature schedule.  Again, this is just a guess, if you post your model, I 
can take a look at it.  

-Eddie




________________________________
From: Dana Troy <DTroy at glumac.com>
To: equest-users at lists.onebuilding.org
Sent: Wed, October 13, 2010 6:36:50 PM
Subject: [Equest-users] Large Auxiliary Energy Use

 
In eQUEST, I have a chilled water VAV system with no heating and an economizer.
 
When I set the economizer limits to 70-F high and 55-F low, the energy use is as 
expected. The chiller operates more hours, etc.
 
When I eliminate the low limit, the chiller energy use goes way down as 
expected, however, an extremely large auxiliary energy use shows up on the BEPS 
and BEPU report. It is not the pumps, because I checked the energy use of the 
pumps in the PS-C report.
 
When looking through the output report I can’t find anything that is showing 
where that energy use is coming from.
 
Has anyone ever encountered this before that could provide some enlightenment?
 
Thanks,
Dana
 
Dana Troy
Senior Energy Analyst
LEED AP®



________________________________
 
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Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674

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