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<DIV><FONT face=Arial size=2>I have not spent much time researching the
eQuest EIR curve origins, but I have spent years performing chiller ratings
and analyzing centrifgual chiller part load curves under many
circumstances.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In my opinion, the CVHE curve is much more
representative of what the energy use will be for (1) chiller operating, than
the eQuest curve. The nature of centrifugal chiller is, below 25% loading
the kW/ton increases. Basically, system inefficiencies, which are
relatively minor compared to power of compression at higher loads, are a bigger
percentage of work input (kW) at low loads.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you have mulitple chillers, more
information is needed to make a determination of what your part load
efficiency would be.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>It would be good to get feedback from someone more
familiar with eQuest EIR.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>SEER is calculated differently than water cooled
chiller performance, so that could be a source for differences as
well.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I hope this helps,</FONT></DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=xiaowei.xu@ny.fk.com href="mailto:xiaowei.xu@ny.fk.com">Xu,
Xiaowei</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 23, 2008 4:06 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Bldg-sim] chiller EIR
curve</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt">Hi,
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt">I
have a question about the chiller EIR curve in eQUEST. In the attachment,
there are two curves of chiller EIR. One is the kWH/Ton curve from chiller
manufacture. One the normalized EIR curve from eQUEST default. These two
curves showed quite big difference when the chiller PLR drops to 30% or lower.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt">In my
simulation, I used manufacturer data and this equation to calculate the EIR,
and then normalized the EIR to get the curve. <o:p></o:p></SPAN></FONT></P><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">Cooling EIR = 0.941 * (1/(SEER/3.413))<o:p></o:p></SPAN></FONT></PRE>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt">Because about 20% of the chiller hours ran at less 20%
of PLR, using two different curves (calculated manufacturer curve and eQUEST
default curve) caused huge difference of chiller electricity consumption. So
my question is which curve is right for the chiller performance? Thank you
very much.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
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