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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I cannot recall dabbling with this in recent memory, but I think you might want to read up on the staged-capacity/staged-volume PVVT system options in the doe2 reference.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="mk:@MSITStore:C:\Users\sesa399002\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/volume2dictionary.htm"><span style="color:windowtext;text-decoration:none">Volume
2: Dictionary</span></a> > <a href="mk:@MSITStore:C:\Users\sesa399002\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/hvaccomponents.htm">
<span style="color:windowtext;text-decoration:none">HVAC Components</span></a> > <a href="mk:@MSITStore:C:\Users\sesa399002\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/system1.htm">
<span style="color:windowtext;text-decoration:none">SYSTEM</span></a> > <a name="_Toc358449827">
Staged Flow/Capacity DX Cooling/Heating Systems</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Reviewing the help files, it looks like there are a few options for sequencing that are actually constant volume with 2+ stages of cooling, engaged in response to discharge
temperature. This would appear to be one step removed from return air monitoring as posed, but in line with the concept of varying your mechanical cooling energies in response to aggregate load conditions.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E. (US), BEMP<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span lang="JA" style="font-size:11.0pt;font-family:"Yu Gothic",sans-serif;color:#3A7A46">ニック</span></b><b><span lang="JA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#3A7A46">
</span></b><b><span lang="JA" style="font-size:11.0pt;font-family:"Yu Gothic",sans-serif;color:#3A7A46">ケートン</span></b><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">, P.E. (US), BEMP</span></b><span style="font-size:9.0pt;font-family:"Calibri",sans-serif;color:#626469"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:150%"><span style="font-size:9.0pt;line-height:150%;font-family:"Arial",sans-serif;color:#626469">Senior Energy Engineer</span><span style="font-size:9.0pt;line-height:150%;font-family:"Arial",sans-serif;color:#1F497D"><br>
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<p class="MsoNormal" style="line-height:150%"><span style="font-size:9.0pt;line-height:150%;font-family:"Arial",sans-serif;color:#626469">+81 . 070 . 3366 . 3317</span><span style="font-size:11.0pt;line-height:150%;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46"><img border="0" width="624" height="8" style="width:6.5in;height:.0833in" id="image010.jpg_x0040_01D6B128.239DA330" src="cid:image002.jpg@01D71A6D.7EC81C00"></span><span style="font-size:10.5pt;font-family:"Yu Gothic",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Chapin, Alex N via Equest-users<br>
<b>Sent:</b> Saturday, March 13, 2021 3:07 AM<br>
<b>To:</b> Ömer Moltay <omoltay@mimtarch.com>; equest-users@onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Rooftop Control<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="color:red">[External email: Use caution with links and attachments]</span><o:p></o:p></p>
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<p> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Ömer,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">One way to do this would be to merge all of the zones/spaces into one. There may be a way to do what you want without merging zones, but nothing is coming to
mind. Good luck<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:13.0pt;font-family:"Arial",sans-serif;color:black">Alex Chapin</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"> PE, BEMP, LEED AP BD+C, O+M
<br>
</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">Energy Engineer</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">
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</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">A Day & Zimmermann Company</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">
<br>
<b>O </b>804.521.7072 <br>
4880 Sadler Road, Suite 300 </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#BA0C2F">|
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ömer Moltay [<a href="mailto:omoltay@mimtarch.com">mailto:omoltay@mimtarch.com</a>]
<br>
<b>Sent:</b> Wednesday, March 10, 2021 5:49 PM<br>
<b>To:</b> <a href="mailto:equest-users@onebuilding.org">equest-users@onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Rooftop Control<o:p></o:p></span></p>
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</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Dear All,<o:p></o:p></p>
<p>If a constant volume rooftop is controlled with a thermostat located in a zone, then we have to use either PSZ or PVVT systems to define its control zone.<o:p></o:p></p>
<p>How would one model a control where the rooftop supply air temperature setpoint is set according to the return air temperature (ie. average of zone temperatures)?<o:p></o:p></p>
<p>Thank you in advance,<o:p></o:p></p>
<p>Ömer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP<br>
Mimta EcoYapi, LEED Proven Provider<br>
Hekimsuyu Cad. 559. Sk.<br>
No:39 34255 Kucukkoy Istanbul Turkey<br>
Tel: 90-212-617-2296<br>
Fax: 90-212-617-2297<br>
Mobile: 90-533-957-1394<br>
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