[Bldg-sim] Claiming refrigerated casework savings for a LEED project

Jim Dirkes jim at buildingperformanceteam.com
Wed Jan 22 16:05:40 PST 2014


Great information, Tim!  I’ll check them out.

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: Tim Johnson [mailto:timj at ctagroup.com]
Sent: Wednesday, January 22, 2014 6:40 PM
To: EnergyPlus_Support at yahoogroups.com; Jim Dirkes; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Claiming refrigerated casework savings for a LEED project

The LEED for Retail New Construction and Major Renovations reference guide under EAc1 outlines a baseline refrigeration system.  We have used this for Austin Energy Green Build in the past.  It does a pretty good job but is a little vague on some of your issues.  The Energy Trust of Oregon has a version as well: http://energytrust.org/library/forms/NBE_PG_TechGuidelines.pdf.
Tim


Tim Johnson

Mechanical Engineer

o 208.336.4900 | d 208.577.5645

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>>> Jim Dirkes <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> 1/22/2014 3:32 PM >>>
Dear Forum,
I am modeling a supermarket which has made effort to install refrigerated casework that is more efficient than “normal” in three ways:
•             Casework lighting is LED instead of fluorescent
•             Evaporator fans use ECM motors and are demonstrably more efficient
•             The compressors have higher COP
I did not realize that claiming savings from a “process” load also requires substantiation of the Baseline energy for the process load via comparison to several similar facilities or a published paper.  I wish I knew that months ago!
We have data from three other supermarkets owned by the same company, but these other examples are not identical.  So far, all I can say is that:
a)            Manufacturer literature claims that LEDs used in their casework use ~ 65% less energy than fluorescent lights
b)            ECM fans use about 35% less energy in a manufacturer power comparison table
c)            The COP is better (I do not have detailed data yet)

This strikes me as a fairly weak argument, so I am asking you for suggestions or published data to strengthen the argument.

p.s., My last alternative is to ignore the process energy savings and make it the same for both models.  I think the savings are substantial, however, and would rather find a way to claim them!

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"Attack me … rather than the path I follow and which I point to anyone who asks me where I think it lies. If I know the way home and am walking along it drunkenly, is it any less the right way because I am staggering side to side?"  Leo Tolstoy

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