It sounds like you need to specify a thermostat type of reverse action. I would also increase the throttling range to 6. Look in the documentation for a discussion regarding VAV, thermostats and throttling range or look in the archives.<br>
<br>Carol<br><br><div class="gmail_quote">On Thu, Sep 2, 2010 at 7:24 AM, Sami, Vikram <span dir="ltr"><<a href="mailto:Vikram.Sami@perkinswill.com">Vikram.Sami@perkinswill.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">What is your reheat delta T?</span></p>
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<p class="MsoNormal" style=""><b><span style="font-size: 9pt; color: gray;">Vikram Sami</span></b><span style="font-size: 9pt; color: gray;">, LEED AP</span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt; color: gray;">Sustainable Design Analyst</span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt; color: gray;">1382 Peachtree St. NE, Atlanta, GA 30309</span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt; color: gray;">t: 404-443-7462 f:
</span><span style="font-size: 9pt; color: gray;" lang="ES">404.892.5823 </span><span style="font-size: 9pt; color: gray;"> e: <a href="mailto:vikram.sami@perkinswill.com" target="_blank">vikram.sami@perkinswill.com</a>
</span><span style="font-size: 11pt; color: rgb(31, 73, 125);"><a href="http://www.perkinswill.com/" target="_blank"><span style="font-size: 9pt; color: gray; text-decoration: none;">www.perkinswill.com</span></a></span><span style="font-size: 9pt; color: gray;"></span></p>
<p class="MsoNormal" style="margin-bottom: 3pt;"><b><span style="font-size: 9pt; color: gray;">Perkins+Will.</span></b><span style="font-size: 9pt; color: gray;">
</span><span style="font-size: 9pt; color: rgb(173, 212, 37);">Ideas + buildings that honor the broader goals of society</span><span style="font-size: 9pt; color: green;"></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Tang, Kevin<br>
<b>Sent:</b> Thursday, September 02, 2010 6:09 AM<br>
<b>To:</b> (<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>)<br>
<b>Subject:</b> [Equest-users] "Insufficient heating warnings" in 3.64</span></p>
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<p class="MsoNormal"><span>Dear all,</span></p>
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<p class="MsoNormal"><span>I have a LEED model, after switched the version into v3.64 from v3.63, a lot of insufficient heating warnings like below are reported, the percent of hours outside throttling range is also
rise, while the model has been adjusted to no warnings and within 300hours in v3.63, it's a VAV system with electric cooling in summer and purchased heat in winter.</span></p>
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<p class="MsoNormal"><span> </span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";">**WARNING**********************************************************************</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> ZONE E21 North Perim Zn (G.N1)
</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> might have insufficient heating capability.</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> Check that the SYSTEM or ZONE HEATING-CAPACITY plus this</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> ZONEs BASEBOARD-RATING is adequate to maintain the ZONE</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> specified DESIGN-HEAT-T for the calculated peak ZONE load</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> (see LS-A or LS-B for the ZONE peak load.)</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> </span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> ZONE E21 North Perim Zn (G.N1) has a THERMOSTAT-TYPE</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> of REVERSE-ACTION, which, when added to the issues listed</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> in the messages above, will cause excessive underheating.</span><span></span></p>
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<p class="MsoNormal"><span style="font-family: "Courier New";"> </span><span></span></p>
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<p class="MsoNormal"><span>I noticed both No.33 and No.46 in file
<a href="http://doe2.com/download/DOE-22/Bugfixes-047h.pdf" target="_blank"><i><span style="font-family: SimSun;">Bugfixes-047h.pdf</span></i></a></span><span style="font-family: SimSun;">
</span><span>mentioned there are enhancements for "insufficient heating capability" in V3.64, I tried increasing "heat sizing ratio" and "throttle range", but failed, can anyone give me some guidance to fix this issue
? I wish can benefit from soem new features in v3.64, but it's close to the end of project, there is little space to play.</span></p>
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<p class="MsoNormal"><span> </span></p>
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<p class="MsoNormal"><span>Thanks in advance for your help!</span></p>
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<p class="MsoNormal"><span style="color: blue;">Best Regards</span><span></span></p>
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<p class="MsoNormal"><span style="color: blue;">Kevin Tang</span><span></span></p>
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<p class="MsoNormal"><span>Project Engineer | Energy Solution | Owens Corning China</span></p>
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<p class="MsoNormal"><span>Tel: 8621-6101 9622 | Fax 8621- 6101 9588
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<p class="MsoNormal"><span><a href="mailto:Kevin.tang@owenscorning.com" target="_blank">Kevin.tang@owenscorning.com</a></span></p>
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<p class="MsoNormal"><span> </span></p>
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<p class="MsoNormal"><span style="font-size: 10pt;"> </span><span></span></p>
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