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<p class=MsoNormal><span style='color:#1F497D'>You already know how to make it
work (your last recommendation about building a dummy zone).<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'>Build a dummy zone, include the
IT room max power load (KW), create a fan coil system for that room, and just
zero out the fan energy. You’ll also need to use a free-cooling
chiller in your loop.<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'>Or, you can do it all thru the
chiller – the free-cooling chiller provides waterside economizer
operation automatically for your chilled water loop, and you don’t have
to specify a system if you don’t want to. However, I’ve never
done it this way before, and I’m not sure if a loop HAS to have a system
attached, otherwise you might get no-flow errors even with a process
load?? You’d have to check this…<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'>It would be interesting to do it
both ways, and compare results.<o:p></o:p></span></p>
<p class=MsoNormal><span style='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>
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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>Cassie
Waddell<br>
<b>Sent:</b> Thursday, May 13, 2010 4:47 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Cc:</b> Amit Khanna<br>
<b>Subject:</b> [Equest-users] Water-side Economizers NOT on Airside System?<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'>We are designing an integrated
water-side plant to serve cold water directly to IT racks (No air). We’re
projecting that at 65F water temperature, we should get more than 65%
compressor-free cooling. </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>The current modeling approach it
to build a dedicated cooling system (chiller, cooling tower, associated loops)
with a direct load placed on the loop. We are having difficulty in determining
whether or not we can model a water-side economizer using this approach because
the water-side economizer is specified within the air system (which we have
none). The issue in eQuest is how to introduce water-side economizer in a
secondary loop that only serves process loads and no zones? Is the correct way
to build a dummy zone and system and zero-out the fan power?</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Any ideas?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>________________________________<br>
Cassie Waddell</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mechanical Engineer,
LEED® AP</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Arup <br>
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style='font-size:10.0pt;font-family:"Arial","sans-serif"'>San Francisco CA
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tel: 1 415 946 1660<br>
fax: 1 415 957 9096<a name=QuickMark></a><br>
</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><a
href="mailto:cassie.waddell@arup.com"
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</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>www.arup.com</span><o:p></o:p></p>
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