<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><div></div><div>I can not say for sure, but it could have to do with the way your chilled water loop is controlled. If it is set to standby, the chiller will idle when it is not in use. That , with a bad performance curve could possibly give you this problem. I would try setting the loop to Demand, or put it on a temperature schedule. Again, this is just a guess, if you post your model, I can take a look at it. </div><div><br></div><div>-Eddie<br></div><div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Dana Troy <DTroy@glumac.com><br><b><span
style="font-weight: bold;">To:</span></b> equest-users@lists.onebuilding.org<br><b><span style="font-weight: bold;">Sent:</span></b> Wed, October 13, 2010 6:36:50 PM<br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] Large Auxiliary Energy Use<br></font><br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">In eQUEST, I have a chilled water VAV system with no heating and
an economizer.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">When I set the economizer limits to 70-F high and 55-F low, the
energy use is as expected. The chiller operates more hours, etc.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">When I <u>eliminate the low limit</u>, the chiller energy use goes
way down as expected, however, an <i>extremely</i> large auxiliary energy use
shows up on the BEPS and BEPU report. It is not the pumps, because I checked
the energy use of the pumps in the PS-C report.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">When looking through the output report I can’t find
anything that is showing where that energy use is coming from.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">Has anyone ever encountered this before that could provide some enlightenment?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">Thanks,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">Dana</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"sans-serif";color:#1F497D;">Dana Troy</span></b><span style="color:#1F497D;"><br>
</span><span style="font-size:10.0pt;font-family:"sans-serif";color:#1F497D;">Senior Energy Analyst</span><span style="color:#1F497D;"><br>
</span><span style="font-size:10.0pt;font-family:"sans-serif";color:#1F497D;">LEED AP<sup>®</sup></span><span style="color:#1F497D;"> <br>
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