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<p class=MsoNormal><span style='color:black'>I suggest that you make an
equivalent chiller in eQuest that acts as the series-counterflow machines (together
as one modeled chiller, with combined performance data – the vendor
should be able to provide this for both working together) and use the logic to
run it when the load is high, then make a second chiller that is equivalent to
the single chiller that you would use when the load is lower, based on whatever
staging sequences that will be used in the design.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>There are some advantages in
compressor energy consumption and high-</span><span style='font-family:Symbol;
color:black'>D</span><span style='color:black'>T situations like Katie’s
model, which may be partially offset by pumping energy depending on your
configuration.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>You can find a couple of articles
out there from ASHRAE Journal, several from the vendors, also I have one from
Dave Grumman and Al Butkus appearing in BD+C magazine in 1986 – not a new
idea!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><u><span style='color:black'>
<o:p></o:p></span></u></p>
<p class=MsoNormal><span style='font-size:8.0pt;color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='color:#1F497D'>David S. Eldridge, Jr.</span></b><b><span
style='color:#244061'>, P</span></b><b><span style='color:#1F497D'>.</span></b><b><span
style='color:#244061'>E</span></b><b><span style='color:#1F497D'>.</span></b><b><span
style='color:#244061'>, LEED AP BD+C, BEMP, HBDP<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='color:#1F497D'>Project Manager</span><span
style='font-size:10.0pt;color:#244061'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:4.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#365F91'>Direct: (847) 316-92</span><span
style='color:#1F497D'>24</span><span style='color:#365F91'> | Fax: (</span><span
style='color:#1F497D'>847</span><span style='color:#365F91'>) </span><span
style='color:#1F497D'>328</span><span style='color:#365F91'>-</span><span
style='color:#1F497D'>4550</span><span style='color:#365F91'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><a
href="http://www.grummanbutkus.com">http://www.grummanbutkus.com</a><o:p></o:p></span></p>
<p class=MsoNormal><b><span style='color:#244061'>Grumman/Butkus Associates</span></b><span
style='color:gray'> </span><span style='color:#365F91'>| 820 Davis Street,
Suite 300 | Evanston, IL 60201</span><span style='font-size:12.0pt;color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'>Energy Efficiency Consultants
and Sustainable Design Engineers<o:p></o:p></span></p>
<p class=MsoNormal><u><span style='color:black'>
<o:p></o:p></span></u></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Diep,
Tu<br>
<b>Sent:</b> Tuesday, March 30, 2010 3:55 PM<br>
<b>To:</b> Katie Tuttle; eQUEST Users List<br>
<b>Subject:</b> Re: [Equest-users] Series Chillers<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Katie,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>You might want to talk with your
local York rep. Our local rep mentioned York is aggressively marketing this
design approach. Hopefully they can share some insight why they think
it’s a great alternative to parallel. I am not convinced but
that’s another story. <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Tu Diep, P.E. LEED AP BD+C<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Affiliated Engineers, Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>2700 Ygnacio Valley Road, #170 | Walnut Creek, CA 94598 | <b>phone</b>
925-933-8400 ext. 204 | <b>fax</b> 925-933-8401 I tdiep@aeieng.com </span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> <o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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