Great information, Tim! I’ll check them out.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: Tim Johnson [mailto:timj@xxxxxxxxxxxx]
Sent: Wednesday, January 22, 2014 6:40 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx; Jim Dirkes; bldg-sim@xxxxxxxxxxxxxxxxxxxxx
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 |
Dear Forum,
I am modeling a supermarket which has made effort to install refrigerated casework that is more efficient than “normal” in three ways:
� &nbbsp; Casework lighting is LED instead of fluorescent
� p; 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!
"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