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

Keith Swartz kswartz at ecw.org
Thu Jan 23 14:17:22 PST 2014


Jim,

There is a similar baseline description of commercial refrigeration systems in Alliant Energy’s Technical Guide Book 2012. Start on page 124 of  http://www.alliantenergy.com/wcm/groups/wcm_internet/@int/documents/document/mdaw/mdiz/~edisp/023759.pdf.
Info for anti-condensate door heater controls starts on page 119.
Info for LED lighting in refrigeration cases starts on page 48.

The State of Illinois also publishes deemed savings values for various upgrades in their Technical Reference Manual (TRM). See Section 4.6 for refrigeration. http://www.ilsag.info/il_trm_version_2.html

ComEd incentives for refrigeration upgrades are listed in https://www.comed.com/Documents/business-savings/SIFYB_PY6_Refrigeration.pdf.

Some of the measures in the above references are specifically for upgrading existing equipment, not new construction, so read the fine print carefully.

I hope this helps!

Sincerely,
Keith Swartz, PE, BEMP, LEED AP
Senior Energy Engineer | Energy Center of Wisconsin | Madison.Chicago.Minneapolis
608.210.7123 | www.ecw.org<http://www.ecw.org/>

From: Tim Johnson [mailto:timj at ctagroup.com]
Sent: Wednesday, January 22, 2014 5:40 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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