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<p class="MsoNormal">As I have noted before (<a href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2015-December/001790.html">http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2015-December/001790.html</a>) in my experience,
the best way to do DCV in eQUEST is to do a manual calculation of the expected reduction in OA rates by looking at the fan schedule and the occupancy schedule. Keep in mind that only the “people” part of the OA rate will be reduced, whereas the “area” part
will stay the same. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If you’d like to know what your model is doing you may want try comparing the hourly outdoor air rates for your system with and without DCV. You can create an hourly report for the system in question with the hourly supply flow rate and
outdoor air fraction printed to the hourly report file. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I know that the new version of DOE2.3 has made some changes to the outdoor air calculation methodology but I haven’t had a chance to test this yet.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All the best,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Daniel<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Equest-users <equest-users-bounces@lists.onebuilding.org> on behalf of Harshal Gupta via Equest-users <equest-users@lists.onebuilding.org><br>
<b>Reply-To: </b>Harshal Gupta <harshal8899@gmail.com><br>
<b>Date: </b>Friday, January 11, 2019 at 10:24 PM<br>
<b>To: </b>"equest-users@lists.onebuilding.org" <equest-users@lists.onebuilding.org><br>
<b>Subject: </b>[Equest-users] Increassed cooling consumption with DCV Modeling<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9">Hello Energy Modelers,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9">This is regarding to increased cooling consumption while modelling DCV in eQUEST.I have prepared a hourly analysis on a single zone modeled without and with DCV,
hourly result is attached.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:#006FC9">Modeling Inputs
</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p></o:p></span></p>
</div>
<ol start="1" type="1">
<li class="MsoNormal" style="color:#333333;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"helvetica neue";color:#0C64C0">Project Location :
<b>Bangalore India</b> <b>(moderate climate)</b>. </span><span style="font-size:12.0pt;font-family:"helvetica neue""><o:p></o:p></span></li><li class="MsoNormal" style="color:#333333;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"helvetica neue";color:#0C64C0">Occupancy profile :
<b>90%</b> in office hours and <b>50%</b> in lunch hours</span><span style="font-size:12.0pt;font-family:"helvetica neue""><o:p></o:p></span></li><li class="MsoNormal" style="color:#333333;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"helvetica neue";color:#0C64C0">Minimum air schedule is modeled in air side and minimum control is set to<b> DCV reset down.</b></span><span style="font-size:12.0pt;font-family:"helvetica neue""><o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#0C64C0">The outcomes are summarize below:</span>
<o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
</div>
<div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="432" style="width:4.5in;border-collapse:collapse">
<tbody>
<tr style="height:.2in">
<td width="359" colspan="2" valign="bottom" style="width:269.0pt;border:solid #D4D4D4 1.0pt;background:#00B050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black"> =Without DCV-With DCV<o:p></o:p></span></p>
</td>
<td width="73" valign="bottom" style="width:55.0pt;border:solid #D4D4D4 1.0pt;border-left:none;background:#00B050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal"><span style="color:black">Remarks <o:p></o:p></span></p>
</td>
</tr>
<tr style="height:.2in">
<td valign="bottom" style="border:solid #D4D4D4 1.0pt;border-top:none;background:#92D050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black"> Difference in supply air flow (btu)<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#C6E0B4;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">2,98,886<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#E2EFDA;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Reduced<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:.2in">
<td valign="bottom" style="border:solid #D4D4D4 1.0pt;border-top:none;background:#92D050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">Difference in latent (btu)<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#C6E0B4;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">0<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#E2EFDA;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">No change<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:.2in">
<td valign="bottom" style="border:solid #D4D4D4 1.0pt;border-top:none;background:#92D050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">Difference in total tonnage (TR)<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#C6E0B4;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">-1,764<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#E2EFDA;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Increased<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:.2in">
<td valign="bottom" style="border:solid #D4D4D4 1.0pt;border-top:none;background:#92D050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">Difference in fresh air (CFM)<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#C6E0B4;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">8,51,210<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#E2EFDA;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Reduced<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:.2in">
<td valign="bottom" style="border:solid #D4D4D4 1.0pt;border-top:none;background:#92D050;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">Difference in vent fan consumption (kW)<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#C6E0B4;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">32<o:p></o:p></span></p>
</td>
<td valign="bottom" style="border-top:none;border-left:none;border-bottom:solid #D4D4D4 1.0pt;border-right:solid #D4D4D4 1.0pt;background:#E2EFDA;padding:.75pt .75pt .75pt .75pt;height:.2in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Reduced<o:p></o:p></span></p>
</td>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:#006FC9">Queries :</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p></o:p></span></p>
</div>
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<ol start="1" type="1">
<li class="MsoNormal" style="color:#006FC9;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Supply flow air and vent fan consumption is reduced, why their is an increment total cooling consumption.
<o:p></o:p></span></li><li class="MsoNormal" style="color:#006FC9;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Why their is no change in Total SPACE latent heat load from LOADS (Btu/hr).
<o:p></o:p></span></li><li class="MsoNormal" style="color:#006FC9;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2;background-color:rgba(0, 0, 0, 0)">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">What should be the correct way to model this and get efficiency.
<o:p></o:p></span></li></ol>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006FC9"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Warm Regards <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Harshal Gupta</span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#073763">Energy Analyst</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#0C64C0"><a href="https://www.usgbc.org/organizations/environmental-design-solutions-eds?view=employees" title="https://www.usgbc.org/organizations/environmental-design-solutions-eds?view=employees"><span style="color:#0C64C0">LEED
AP</span></a> </span><span class="owaautolink"><span style="font-family:"Arial",sans-serif;color:black"><a href="https://igbc.in/igbc/redirectHtml.htm?redVal=showIgbcApnosign"><span style="color:#0C64C0">|| IGBC AP</span></a></span></span><span style="font-family:"Arial",sans-serif;color:black"><a href="http://www.grihaindia.org/index.php?option=com_fabrik&view=list&listid=31&t=griha_community&Itemid=0&resetfilters=0">
</a></span><span style="font-family:"Arial",sans-serif;color:#0C64C0">|| </span><span style="font-family:"Arial",sans-serif;color:black"><a href="http://www.grihaindia.org/index.php?option=com_fabrik&view=list&listid=31&t=griha_community&Itemid=0&resetfilters=0"><span style="color:#0C64C0">GRIHA
CP</span></a></span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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