[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
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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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