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<DIV><FONT face=Arial size=2>Not having looked too closely at the options, I
would suggest not centrifugal. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Centrifugals are almost always water cooled,
have modulating capabilites from10% to 100% capacity, and generally dont go
below 200 tons capacity. They are positive displacment compressors and
will follow the "fan laws", meaning there is a cubic relationship between energy
used and cooling capacity (tons). Similar to a centrifugal pump and
fan.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Scrolls are (until the very near future) air cooled
and on/off control. They are staged. You wont see them
over about 150 tons total chiller size. Part load capacity is
pretty constant, in terms of kW/ton. There are usually multiple
stages. At 50% load, half the compressors (therefore power requirement) is
used.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Generally speaking, scroll IPLVs run about 1.1
kW/ton</FONT></DIV>
<DIV><FONT face=Arial size=2>water cooled centrifguals operate at around .50
kW/ton. But cooling towers need to be added, as well as condenser water
pumps. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Lots of variables to consider. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Hope this was helpful.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>W. Peter Anderson, P.E<BR>JP Engineering<BR>41
Mechanic Street<BR>Windsor, CT 06095<BR>Ph: 860/688-5223<BR>Fax:
860/688-5269</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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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=ericy@pae-engineers.com href="mailto:ericy@pae-engineers.com">Eric
Youngson</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> Monday, May 19, 2008 12:47 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Bldg-sim] Scroll Chiller</DIV>
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I need to model a scroll chiller (. Does anyone have an opinion on which
eQUEST chiller is a reasonable choice for this? I was thinking that
centrifugal would be the closest but this is simply based on mechanical
operation. I would like to choose the closest model based on
performance.<o:p></o:p></P>
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