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Hi Kurt, <br><br>
We model a refrigerated warehouse using ESPr and TRNSYS. We did not
try Energy+.<br>
The main reason was to evaluate the effect of the thermal mass stored
against the incoming product that was warmer.<br>
when we compare our result to those of the refrigeration contractor there
was a big difference. Half of their calculated load<br>
And compare to actual energy consumption, it was close.<br><br>
So if you use energy+ be shure to include thermal mass.<br><br>
Martin<br>
<br><br>
<br>
At 15:00 26/05/2011, Jeff Haberl wrote:<br>
<blockquote type=cite class=cite cite="">Kurt,<br><br>
We had this problem before in the mid-80s simulating an ice rink at a Rec
Center. This was published in an ASHRAE Transactions paper. We basically
got around the issue by fudging the "U x A x Delta-T"...in this
case fiddling with either the U or the A to adjust for the Delta-T.
Results worked well against metered data.<br><br>
Jeff<br><br>
8=! 8=) :=) 8=) ;=) 8=) 8=(
8=) 8=() 8=) 8=| 8=) :=')
8=)8=?<br><br>
Jeff S. Haberl, Ph.D.,P.E.,
FASHRAE..............jhaberl@tamu.edu<br><br>
Professor............................................................Office
Ph: 979-845-6507<br><br>
Department of Architecture.............................Lab
Ph:979-845-6065<br><br>
Energy Systems Laboratory.............................FAX:
979-862-2457<br><br>
Texas A&M
University.....................................77843-3581<br><br>
College Station, Texas, USA,
77843..................URL:<a href="http://www.esl.tamu.edu/" eudora="autourl">
www.esl.tamu.edu</a><br><br>
8=/ 8=) :=) 8=) ;=) 8=) 8=()
8=) :=) 8=) 8=! 8=) 8=? 8=)8=0<br>
________________________________________<br>
From: bldg-sim-bounces@lists.onebuilding.org
[bldg-sim-bounces@lists.onebuilding.org] on behalf of kcreamer@nc.rr.com
[kcreamer@nc.rr.com]<br>
Sent: Monday, May 23, 2011 9:19 PM<br>
To: bldg-sim@lists.onebuilding.org<br>
Subject: [Bldg-sim] Walk-in Coolers/Freezers<br><br>
Hi all,<br><br>
Is it possible to use EnergyPlus to model a walk-in cooler or
freezer? I have tried but regardless of the temperature setpoint I
choose for the freezer, the modeled temperature does not want to drop
below about 42 F.<br><br>
Also, has anyone made a model of a cooler that accurately estimates
electricity loads? I was able to model a cooler with a 45 F
setpoint but I was way under the electricity consumption estimates I
found for coolers/freezers on the web. I think my problem was the
large amount of electrical usage for non-compressor loads defrost
cycle, evaporator fan, condenser fan, etc.<br><br>
Kurt Creamer<br>
Apex, NC<br><br>
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