[bldg-sim] Glycol Chillers/Pacakge units..

Aulbach, John jaulbach at nexant.com
Tue Jan 23 11:12:05 PST 2007


Hi Folks:
 
I am running into a few office/data center buildings where the main
office areas are cooled by conventional chillers and the data
center/server areas are conditioned by either Liebert type package units
or 40% glycol-to-water mix chillers (colder climates that still need
servers cooled). Naturally, both units will be on the same electric
meter.
 
The standard DOE-2 does not model glycol cooling, and a commercial
building does not need the refrigeration version of eQuest.  Usually, I
know the kw/ton (or the moral equivalent) of the glycol cooling source.
But glycol/water does not have the same heat absorption properties as
straight shot water to follow the load.
 
I am trying to insure I am showing the correct energy used by these
units, as I believe the LEED now includes the process loads within the
Base and Proposed models to certify the level of LEED obtained.
 
Does anyone have any "tricks" they have used?
 
John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
100 North Barranca, Suite 820
West Covina, CA 91791 USA
Phone: 626-430-9054
Fax: 626-430-9060
email: jaulbach at nexant.com
 


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