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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>James & Cassie,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have been able to have chilled water loops with only process
loads. To avoid the zero design flow errors on loops, I often put in a
tiny process load with a schedule that is only on for a single hour on the
design day. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Admittedly, I have not tested this approach with all of the free
cooling operations but I think it is worth trying before creating a dummy space
and AHU.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Paul Riemer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dunham<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><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>James
Hansen<br>
<b>Sent:</b> Thursday, May 13, 2010 3:58 PM<br>
<b>To:</b> Cassie Waddell; equest-users@lists.onebuilding.org<br>
<b>Cc:</b> Amit Khanna<br>
<b>Subject:</b> Re: [Equest-users] Water-side Economizers NOT on Airside
System?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>You already know how to make it work (your last
recommendation about building a dummy zone).<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>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></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>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></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>It would be interesting to do it both ways, and compare
results.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>GHT Limited<br>
<ns0:PersonName>James Hansen</ns0:PersonName>, PE, LEED AP<o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>Senior Associate<o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><ns0:Street><ns0:address>1010 N. Glebe Rd, Suite 200</ns0:address></ns0:Street><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><ns0:place><ns0:City>Arlington</ns0:City>, <ns0:State>VA</ns0:State>
<ns0:PostalCode>22201-4749</ns0:PostalCode></ns0:place><o:p></o:p></p>
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margin-left:.5in'>703-338-5754 (Cell)<o:p></o:p></p>
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margin-left:.5in'>703-243-1200 (Office)<o:p></o:p></p>
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margin-left:.5in'><a href="http://www.ghtltd.com/">www.ghtltd.com</a><o:p></o:p></p>
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margin-left:.5in'><b><o:p> </o:p></b></p>
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<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>From:</b> 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></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>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. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>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?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Any ideas?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>________________________________<br>
Cassie Waddell<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Mechanical Engineer, LEED® AP<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Arup <br>
560 Mission St, Seventh Floor<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>San Francisco CA 94105<br>
tel: 1 415 946 1660<br>
fax: 1 415 957 9096<br>
<a href="mailto:cassie.waddell@arup.com">cassie.waddell@arup.com</a><br>
www.arup.com<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<pre style='margin-left:.5in'>____________________________________________________________<br>
<br>
<o:p></o:p></pre><pre style='margin-left:.5in'>Electronic mail messages entering and leaving Arup business<br>
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<o:p></o:p></pre><pre style='margin-left:.5in'>systems are scanned for acceptability of content and viruses<o:p></o:p></pre></div>
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