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<p class="MsoNormal"><span style="color:#1F497D">Rakesh,<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">The FC-Fan-w/Dampers curve determines fan power as a function of part load. I’m guessing that the system that you have applied this curve to has a MAX-FAN-RATIO greater than one, which is causing the output of
the curve to exceed the OUTPUT-MAX.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The OUTPUT-MAX for the curve is 1.05, as shown on the warning message and in the curve properties dialog box (see below).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The warning message is showing that the fan power is being limited to the maximum allowable by the curve. The flow through the supply fan is exceeding 100% of design value, but the power is not increased accordingly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">You can reduce the MAX-FAN-RATIO to 1.0 assuming the fan is limited in that way. Alternatively, you could increase the curve OUTPUT-MAX, either in the library curve or by creating a new curve as I have shown
below. This will extrapolate values of the curve beyond their intended range, so the accuracy of the fan power at greater than design flow may be a little off, but it is certainly better than not making any changes.<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bill<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"><img width="475" height="305" id="Picture_x0020_2" src="cid:image004.jpg@01CE3506.D06292C0"></span><span style="color:#1F497D"><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"><img width="476" height="281" id="Picture_x0020_3" src="cid:image006.jpg@01CE3506.D06292C0"></span><span style="color:#1F497D"><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"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black">William Bishop, PE, BEMP, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:5.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D">Rochester, NY 14608<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D">T: (585) 325-6004
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Ext. 114</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D">F: (585) 325-6005</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">wbishop@pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">
</span><span style="color:#1F497D"><a href="http://www.pathfinder-ea.com/"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">www.pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:Webdings;color:green">P</span><span style="font-size:14.0pt;font-family:"Times New Roman","serif";color:green">
</span><span style="font-size:7.5pt;font-family:"Times New Roman","serif";color:green">Sustainability – the forest AND the trees.</span><span style="font-size:18.0pt;font-family:Webdings;color:green">
</span><span style="font-size:14.0pt;font-family:Webdings;color:green">P</span><span style="font-size:14.0pt;color:green"> </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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<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>Rakesh Desai<br>
<b>Sent:</b> Tuesday, April 09, 2013 8:40 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Caution Message<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">While running my proposed case, I am getting the attached caution message.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone help me to understand what it is meant and how to solve the problem?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rakesh Desai<o:p></o:p></p>
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