[Bldg-sim] Walk-in Coolers/Freezers

Jeff Haberl jhaberl at tamu.edu
Thu May 26 12:00:00 PDT 2011


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:www.esl.tamu.edu

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________________________________________
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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