<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt"><br><div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><div id="yiv97726636"><div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;"><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;"><div style="font-family:times new roman, new york, times, serif;font-size:12pt;"><br><div id="yiv97726636"><div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;"><div><span>I am not clear what this warning is saying as the wording is "MIGHT" have insufficient heating capability. I too am getting this warning, but I have very little unmet heating hours. Increasing the cfm/sq.ft only increases total energy use but does not get rid of the
warning. It seems to me it may be a software issue rather than a design issue?</span></div><div><span><br></span></div><div><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;"><div style="font-family:times new roman, new york, times, serif;font-size:12pt;"><font face="Arial" size="2"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> DongEun Kim <equested@gmail.com><br><b><span style="font-weight:bold;">To:</span></b> Carol Gardner <cmg750@gmail.com><br><b><span style="font-weight:bold;">Cc:</span></b> equest-users@lists.onebuilding.org<br><b><span style="font-weight:bold;">Sent:</span></b> Monday, July 25, 2011 7:12:44 AM<br><b><span style="font-weight:bold;">Subject:</span></b> Re: [Equest-users] insufficient heating capability<br></font><br><div id="yiv97726636"><div>Thank you Carol!</div>
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<div>I modified "Min Design Flow(cfm/ft2) .</div>
<div> </div>
<div>However, "insufficient heating" warning is keep showing. </div>
<div> </div>
<div>Only thing seems to work to solve this problem is to increase heating capacity is Reheat delta T.</div>
<div>(Its system is VAV with Reheat).</div>
<div> </div>
<div>What I can't understand the most is that specifying heating capacity of main heating coil doesn't </div>
<div> </div>
<div>affect the heating capacity anyhow.</div>
<div> </div>
<div>Any thoughts on this anyone???</div>
<div> </div>
<div>Thank you!</div>
<div> </div>
<div>DE</div>
<div> </div>
<div class="yiv97726636gmail_quote">2011/7/25 Carol Gardner <span dir="ltr"><<a rel="nofollow" ymailto="mailto:cmg750@gmail.com" target="_blank" href="mailto:cmg750@gmail.com">cmg750@gmail.com</a>></span><br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex;" class="yiv97726636gmail_quote">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>
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<div class="yiv97726636h5"><br>
<div class="yiv97726636gmail_quote">On Sun, Jul 24, 2011 at 5:16 PM, DongEun Kim <span dir="ltr"><<a rel="nofollow" ymailto="mailto:equested@gmail.com" target="_blank" href="mailto:equested@gmail.com">equested@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex;" class="yiv97726636gmail_quote">
<div>Thank you John,</div>
<div> </div>
<div>But isn't airflow supposed to be auto-sized if not specified?</div>
<div> </div>
<div>I intentionally leave the flowrate blank to let the program calculate the cfm that serves load the best.</div>
<div> </div>
<div>Should still I specifiy cfm?</div>
<div> </div>
<div>DE<br><br></div>
<div class="yiv97726636gmail_quote">2011/7/23 John Aulbach <span dir="ltr"><<a rel="nofollow" ymailto="mailto:jra_sac@yahoo.com" target="_blank" href="mailto:jra_sac@yahoo.com">jra_sac@yahoo.com</a>></span><br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex;" class="yiv97726636gmail_quote">
<div>
<div style="BACKGROUND-COLOR:#fff;FONT-FAMILY:times new roman, new york, times, serif;COLOR:#000;FONT-SIZE:12pt;">
<div><span>Try increasing airflow.<var></var><br></span></div>
<div><br></div>
<div style="FONT-FAMILY:times new roman, new york, times, serif;FONT-SIZE:12pt;">
<div style="FONT-FAMILY:times new roman, new york, times, serif;FONT-SIZE:12pt;"><font face="Arial" size="2">
<div style="BORDER-BOTTOM:#ccc 1px solid;BORDER-LEFT:#ccc 1px solid;PADDING-BOTTOM:0px;LINE-HEIGHT:0;MARGIN:5px 0px;MIN-HEIGHT:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;FONT-SIZE:0px;BORDER-TOP:#ccc 1px solid;BORDER-RIGHT:#ccc 1px solid;PADDING-TOP:0px;">
</div><b><span style="FONT-WEIGHT:bold;">From:</span></b> DongEun Kim <<a rel="nofollow" ymailto="mailto:equested@gmail.com" target="_blank" href="mailto:equested@gmail.com">equested@gmail.com</a>><br><b><span style="FONT-WEIGHT:bold;">To:</span></b> <a rel="nofollow" ymailto="mailto:equest-users@lists.onebuilding.org" target="_blank" href="mailto:equest-users@lists.onebuilding.org">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></div>
<div><br>
<div>
<div>Hi eQuesters!</div>
<div> </div>
<div>Can anyone help me here?</div>
<div> </div>
<div>I installed main heating coil as well as reheat coil with delta T=30.</div>
<div> </div>
<div>Heating capacity and cfm is not defined so that they will be auto-sized.</div>
<div> </div>
<div>
<div>And, I keep having this warning saying that the system "might have insufficient heating capability."</div>
<div> </div>
<div>
<div>I increased "Zone Entering Max Supply Temp", "Hot Deck Max Leaving Temp." But, the problem stays.</div>
<div> </div>
<div> </div>
<div>How do I increase the heating capability?</div>
<div>Thank you !!</div>
<div> </div>
<div>DE</div></div>
<div> </div>
<div><br> </div></div>
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<br></div></div><font color="#888888">-- <br>Carol Gardner PE<br>
<div></div></font></blockquote></div><br>
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