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

[Jim Dirkes]

Another good insight.  Thank you!

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: Rosenberg, Michael I [mailto:Michael.Rosenberg at pnnl.gov]
Sent: Wednesday, January 22, 2014 9:46 PM
To: Jim Dirkes
Cc: EnergyPlus_Support at yahoogroups.com; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Claiming refrigerated casework savings for a LEED project

Jim,

The 2013 version of ASHRAE Standard 90.1 added requirements for refrigerated casework. I suggest you identify where your project exceeds those requirements and make the case to USGBC that what is in 90.1 should be the baseline. Good luck.

__________________________

Michael Rosenberg, CEM, LEED AP
Senior Research Scientist
ENERGY & ENVIRONMENT DIRECTORATE

Pacific Northwest National Laboratory
2032 Todd Street<x-apple-data-detectors://0/0>
Eugene, OR 97405<x-apple-data-detectors://0/0>
(541) 844-1960<tel:(541)%20844-1960>
michael.rosenberg at pnnl.gov<mailto:michael.rosenberg at pnl.gov>
www.pnnl.gov<http://www.pnl.gov/>

On Jan 22, 2014, at 17:33, "Jim Dirkes" <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> wrote:
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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