Hi DE,<br><br>If you look around at all the defaults you will probably find that somewhere eQUEST is defaulting to 0.5 cfm/sf for your supply air. This is often insufficient to meet your heating/cooling requirements. Things I have done in the past to fix this is to use the same cfm/sf as the proposed building uses, or look in the little ASHRAE Pocket Guide for what they recommend for your building type. These two numbers will likely be similar<br>
<br>Carol. <br><br><div class="gmail_quote">On Sun, Jul 24, 2011 at 5:16 PM, DongEun Kim <span dir="ltr"><<a href="mailto:equested@gmail.com">equested@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>Thank you John,</div>
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<div>But isn't airflow supposed to be auto-sized if not specified?</div>
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<div>I intentionally leave the flowrate blank to let the program calculate the cfm that serves load the best.</div>
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<div>Should still  I specifiy cfm?</div>
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<div>DE<br><br></div>
<div class="gmail_quote">2011/7/23 John Aulbach <span dir="ltr"><<a href="mailto:jra_sac@yahoo.com" target="_blank">jra_sac@yahoo.com</a>></span><br>
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<div><span>Try increasing airflow.<var></var><br></span></div>
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</div><b><span style="font-weight:bold">From:</span></b> DongEun Kim <<a href="mailto:equested@gmail.com" target="_blank">equested@gmail.com</a>><br><b><span style="font-weight:bold">To:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>

<b><span style="font-weight:bold">Sent:</span></b> Friday, July 22, 2011 12:13 AM<br><b><span style="font-weight:bold">Subject:</span></b> [Equest-users] insufficient heating capability<br></font>
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<div>Hi eQuesters!</div>
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<div>Can anyone help me here?</div>
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<div>I installed main heating coil as well as reheat coil with delta T=30.</div>
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<div>Heating capacity and cfm is not defined so that they will be auto-sized.</div>
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<div>And, I keep having this warning saying that the system "might have insufficient heating capability."</div>
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<div>I increased "Zone Entering Max Supply Temp", "Hot Deck Max Leaving Temp."  But, the problem stays.</div>
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<div>How do I increase the heating capability?</div>
<div>Thank you !!</div>
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<div>DE</div></div>
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<div> </div></div><br></div></div>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>

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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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