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<p class="MsoNormal">Bryan:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve poked around a bit over the last week. Have a couple questions/prompts questions that may help you directly, or help others in advising you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can you assert:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">What are your expectations for what CW supply temps (seen @ each VRF for heat transfer)
<u>should</u> look like as a function of season / conditions /etc? You might in parallel want to look hard at what’s simulated in the moment.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Please contrast the (intended) CW supply temps against the conditions used to assert the heating/cooling capacities entered for each VRF<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ll also observe, as this may be tied to some of the unmet hours you’re tackling in the moment – you may have a few issues in your implementation of the dummy zone approach/workaround:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Your VRF systems (as named) aren’t consistently using the OA-FROM-SYSTEM input, as may be intended<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Be mindful the DOAS system and its dummy zone are “in a bubble” with respect to the conditioning loads for the ventilation air. If there is any humidity control to occur at the DOAS,
you might struggle with such a high drybulb limit for economizer operations. On the flip side, if it’s expected the DOAS will pass overly-humid air to the distributed cooling coils, I don’t think this workaround in doe2.2 will do the job of transmitting
that latent load for you – it may be a manual process of defining some small process space saunas or similar ;-).<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For all: These nuances in VRF/DOAS implementation are part of the reason I really try to stress with friends to utilize the newer doe2.3 feature sets for VRF and DOAS when feasible. In Bryan’s case, I don’t think waterside VRF has made
the transition just yet… but I bring this up to make clear <u>I am not endorsing doe2.2-era workarounds</u> for DOAS/VRF where they are avoidable in this day and age.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:4.5pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">913 . 564 . 6361<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">785 . 410 . 3317<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"><a href="mailto:nicholas.caton@se.com"><span style="font-family:"Calibri",sans-serif;color:#626469">nicholas.caton@se.com</span></a></span></u><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Bryan Papaj via Equest-users<br>
<b>Sent:</b> Tuesday, June 2, 2020 9:02 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Water cooled VRF with DOAS<o:p></o:p></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">Hello,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have a water-cooled VRF system with a DOAS. I modeled this as each individual zone getting its own individual PSZ and followed the eQuest modeling tutorial from Mitsubishi. The DOAS was modeled with a dummy zone and feeds each VRF zone
with the OA-From DOAS. The problem that I am facing is that when I am simulating I have many unmet hours for the VRF zones and when I review the SS-A System Loads Summary Report I see that there is no cooling or heating energy. Has anyone experienced this
before and if so how can I load the VRF system? Also, is there a way to see the individual zone heating or cooling contributions from the DOAS.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have attached my pd2 and inp eQuest files. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">--<o:p></o:p></p>
<p class="MsoNormal"><b>Bryan Papaj</b><o:p></o:p></p>
<p class="MsoNormal"><i>Energy Engineer</i><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b>C. J. Brown Energy, P.C.</b><o:p></o:p></p>
<p class="MsoNormal">4245 Union Rd, Suite 204<o:p></o:p></p>
<p class="MsoNormal">Buffalo, NY 14225<o:p></o:p></p>
<p class="MsoNormal"><i>Phone:</i> (716) 565-9190 <i>Fax:</i> (716) 633-5598<o:p></o:p></p>
<p class="MsoNormal"><i>Email:</i> <a href="mailto:bmp@cjbrownenergy.com"><span style="color:blue">bmp@cjbrownenergy.com</span></a>
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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