<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;color:rgb(7,55,99)">Dear Chris,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;color:rgb(7,55,99)"><br></div><div class="gmail_default"><font color="#073763"><font face="arial, helvetica, sans-serif">For better understanding, you could refer an old discussion happened back in Dec 2013 with the search key word "</font><span style="font-family:arial,sans-serif">Appendix G Secondary </span><span style="font-family:arial,sans-serif;background-color:rgb(255,255,255)">Pump</span> Control" on bldg-sim. <wbr>Additionally refer <a href="https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjJx72BscXOAhXDGpQKHeepDiwQFggbMAA&url=https%3A%2F%2Fwww.ashrae.org%2FFile%2520Library%2FdocLib%2FStdsInterpretations%2FIC-90-1-2007-14.pdf&usg=AFQjCNEYkFLYjiO5JLXS_CEW5HhaKWugFQ&sig2=2E9zbVXqUzWoYd8H2Mbc5A&bvm=bv.129759880,d.dGo" target="_blank">ASHRAE IC-90-1-2007 </a> which ruled that 22 W/GPM is a "Whole System" power requirement.</font></div><div class="gmail_default"><font color="#073763"><br></font></div><div class="gmail_default"><font color="#073763">Hope this helps!</font></div><div class="gmail_default"><font color="#073763"><br></font></div><div class="gmail_default"><font color="#073763"><br></font></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 16, 2016 at 12:04 AM, Chris Jones via Bldg-sim <span dir="ltr"><<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">This topic has come up a few times but I am still somewhat confused as to how to determine the overall baseline building pumping power for a primary/secondary
chilled water system. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Each chiller on the primary loop is to have its own chilled water and condenser water pump. The chilled water and condenser water loops have a pump each.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My question is – what flow rate do you use when setting the W/gpm? Previously, I have been using the secondary chilled water loop flow for determining the 22
W/gpm – split over the primary and secondary loops. Similarly, I had been using the cooling tower loop flow for setting the overall 19 W/gpm for the condenser water system.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Today I am reading the PNNL 25130.pdf manual. In 3.7.5, it states, “Each chiller has its own primary and condenser water pumps that operate when the chiller
is active”. Then it states, “All primary pumps shall be 9 W/gpm and the secondary pump shall be 13 W/gpm, and the condenser water pump is assumed to be 19 W/gpm.”<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Where it states, “All primary pumps shall be 9 W/gpm”, does this mean all the pumps associated with the chillers – chilled and condenser water? Or just the
primary chilled water pumps? If just the primary chilled water pumps and not the chiller condenser water pumps, then what pumping power should the chiller condenser water pump have?<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d">Christopher Jones, P. Eng.<u></u><u></u></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d">Rowan Williams Davies & Irwin Inc.</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d"><br>
<i>Consulting Engineers & Scientists</i><br>
901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5<br>
<b>T:</b> (519) 823-1311 ext 2052 <u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d">M:</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d"> (416) 697-0056
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><font size="2" face="arial, helvetica, sans-serif"><div style="font-style:italic"><i><font size="2" color="#0b5394"><br></font></i></div><font color="#073763">Javed Iqbal, LEED AP, CEA<br>Sr. Energy Analyst</font></font></div><div dir="ltr"><font size="2"><font face="arial, helvetica, sans-serif" color="#000000"><br></font></font></div><div dir="ltr"><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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