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<TITLE>RE: [Bldg-sim] eQuest Default f(PLR) Skepticism</TITLE>
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<P><FONT SIZE=2>Okay, I think I understand now. The EIR fPLR curve is not actually a correction to the EIR efficiency, but to the total power draw of the chiller. I was calculating EIRFPLR as EIR(current conditions)/ EIR (design conditions), when eQUEST wants it in the format of a power draw at current conditions divided by the power draw at design conditions.<BR>
<BR>
This also clears up another question I had which was why eQUEST calculates the total power draw as a function of full load operating capacity and not the actual load. The EIRFPLR curve corrects it.<BR>
<BR>
After fixing my equation the EIRFPLR values I received from the manufacturer are within 2-7% of eQUEST default curves.<BR>
<BR>
Thanks all for your help!<BR>
<BR>
Robby Oylear<BR>
Project Engineer<BR>
direct: 206.788.4571<BR>
cell: 206.354.2721<BR>
www.rushingco.com<BR>
<BR>
-----Original Message-----<BR>
From: John Aulbach [<A HREF="mailto:jra_sac@yahoo.com">mailto:jra_sac@yahoo.com</A>]<BR>
Sent: Monday, February 04, 2008 10:35 AM<BR>
To: Robby Oylear; 'Aulbach, John'; bldg-sim@lists.onebuilding.org<BR>
Subject: Re: [Bldg-sim] eQuest Default f(PLR) Skepticism<BR>
<BR>
I am sure we would welcome typical chiller data that<BR>
minimally complys.Remember that IPLV allows condenser<BR>
water relief for their calculations. eQuest needs<BR>
three curves including the kW/ton at CONSTANT<BR>
condenser water - then the program will "jump a curve"<BR>
to move the kW/ton to its location based on outdoor<BR>
air AND point on the part load curve.<BR>
<BR>
Not always consistant, part load vs. outdoor air. I<BR>
believe Steve Gates has a comment on that in the<BR>
BLDG-SIM archives.<BR>
<BR>
<BR>
<BR>
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