[Bldg-sim] Walk-in Coolers/Freezers

Jorge Torres-Coto jtorres-coto at mbo1.com
Thu May 26 20:08:21 PDT 2011


eQUEST has the refrigeration module that can model this 

 

 

http://doe2.com/equest/index.html

 

We have used this version of eQUEST on restaurants (small QUICK -SERVICE))

Jorge E. Torres Coto   

4830 Viewridge Ave.

San Diego, CA 92123

p              858.751.0933

f              858.751.0937

c              858.688.6088



  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Martin Roy
Sent: Thursday, May 26, 2011 5:14 PM
To: Jeff Haberl
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Walk-in Coolers/Freezers

 

Hi Kurt, 

We model a refrigerated warehouse using ESPr and TRNSYS.  We did not try
Energy+.
The main reason was to evaluate the effect of the thermal mass stored
against the incoming product that was warmer.
when we compare our result to those of the refrigeration contractor there
was a big difference.  Half of their calculated load
And compare to actual energy consumption, it was close.

So if you use energy+ be shure to include thermal mass.

Martin
 


At 15:00 26/05/2011, Jeff Haberl wrote:



Kurt,

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.

Jeff

8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  8=()  8=)  8=|  8=)  :=')  8=)8=?

Jeff S. Haberl, Ph.D.,P.E., FASHRAE..............jhaberl at tamu.edu

Professor............................................................Office
Ph: 979-845-6507

Department of Architecture.............................Lab Ph:979-845-6065

Energy Systems Laboratory.............................FAX: 979-862-2457

Texas A&M University.....................................77843-3581

College Station, Texas, USA, 77843..................URL:
<http://www.esl.tamu.edu/>  www.esl.tamu.edu

8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=)  :=)  8=)  8=!  8=)  8=? 8=)8=0
________________________________________
From: bldg-sim-bounces at lists.onebuilding.org
[bldg-sim-bounces at lists.onebuilding.org] on behalf of kcreamer at nc.rr.com
[kcreamer at nc.rr.com]
Sent: Monday, May 23, 2011 9:19 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Walk-in Coolers/Freezers

Hi all,

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.

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.

Kurt Creamer
Apex, NC

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size=2 width="100%" align=center> 


Martin Roy, ing. PA LEED®, président
Martin Roy et associés
1805 chemin Oka, 
Deux-Montagnes, Qc
J7R 1N3


Tel: 450-623-0340
Cell. 514-594-6352

www.mra.qc.ca <http://www.mra.qc.ca/> 






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