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<p class=MsoNormal><span style='color:#1F497D'>Vikram,<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'>Reid Hart of PECI did a
presentation on this issue for the building simulation user's group a few
months ago, and discussed a spreadsheet tool to construct accurate DOE2
performance curves for variable flow air and water systems. I believe the
powerpoint presentation is still archived on the BSUG yahoo site, and the
spreadsheet is downloadable from PECI's website. I haven't tried using this
tool yet, so I cannot vouch for its accuracy or useability.<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'>Steven<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Bookman Old Style","serif";
color:#1F497D'>Steven Savich, LEED AP</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif";
color:#1F497D'>Systems West Engineers</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif";
color:#1F497D'>411 High Street</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif";
color:#1F497D'>Eugene, OR 97401-2427</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif";
color:#1F497D'>(541) 342-7210</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif";
color:#1F497D'>(541) 342-7220 (fax)</span><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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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Vikram
Sami<br>
<b>Sent:</b> Friday, March 05, 2010 2:01 PM<br>
<b>To:</b> eQUEST Users List<br>
<b>Subject:</b> [Equest-users] More about fans<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#0000B4'>Same model – different fan
question. Table G3.1.3.15 Gives you a part load performance table for VAV fan
systems. Based on that, I created a performance curve (linear) for my VAV fan
system that looks like this:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><img width=734 height=546
id="Picture_x0020_1" src="cid:image001.png@01CABC74.EE9AC8B0"><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>Problem is when I use this as
opposed to the default curve that came out of the wizard, the fan energy
doubles. The fan energy is still only 8% of the overall building load, so its
not alarming. Does this mean that the default curve was way to low? Is the
method above the way to model this performance curve?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>Thanks for your help<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
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Sami,</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#0000B4'> </span><span style='font-size:12.0pt;font-family:"Garamond","serif";
color:black'>LEED AP</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
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