[Equest-users] built-in chiller curves vs. custom

[Jeremy McClanathan]

My general rule of thumb is that if I want to show a quick comparison of standard technology, for example variable speed chiller vs constant speed chiller, or the chiller is basically a place holder in the model and not important for whatever I am looking at, or I can't get the info from the manufacturer, I use default curves.  If I want to compare a turbocore machine vs variable speed screw vs variable speed centrifugal, or Carrier model XXX vs York model XXX, I use custom curves.  If you want to use custom curves and haven't done it before, I would recommend downloading the chiller curve document written by Steve Gates and my spreadsheet from the following link:

http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll

Jeremy

___________________________________________
Jeremy McClanathan, P.E., BEMP, HFDP, LEED(r) AP BD+C
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From: Christian Stalberg [mailto:cstalberg at naturalintelligence.us]
Sent: Friday, September 23, 2011 6:16 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] built-in chiller curves vs. custom

I have a 725 ton chiller with full load efficiency (primary efficiency = .546 kw/ton)
and part load efficiency (NPLV = .464 kw/ton). What are peoples experience in
choosing whether to utilize eQUEST's own built-in chiller curves versus creating
their own custom curves? Are there any rules of thumb as to when the later is
appropriate (because otherwise you are not getting the energy savings under
part load conditions)?

Thanks!


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