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<p class="MsoNormal"><span style="color:#1F497D">Yes, air walls are a key component of this workaround. I have used hourly reports to verify that plenum zone temperature tracks the occupied zone temperature below fairly well, as shown in this screen shot of
a perimeter zone (2<sup>nd</sup> column is plenum zone; 3<sup>rd</sup> is the zone below):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="243" height="585" id="Picture_x0020_3" src="cid:image002.jpg@01CEDAFD.31FA9590"></span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Jeremy McClanathan [mailto:jmcclanathan@CDiengineers.com]
<br>
<b>Sent:</b> Wednesday, November 06, 2013 2:12 PM<br>
<b>To:</b> Bishop, Bill; 'equest-users@lists.onebuilding.org'<br>
<b>Subject:</b> RE: [Equest-users] NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I’ve never used this method, but at first glance it looks like reasonable approach to me. It seems like a key assumption is that using an air wall between the space and plenum acts like air mixing between the
spaces, so loads in each space are seen by the other. That is an assumption I would run some hourly reports and tests to verify. Have you already done that?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Myriad Web Pro";color:gray">___________________________________________</span></b><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F">Jeremy McClanathan</span></b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray">,</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">
P.E., BEMP, HFDP,</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray">
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Bishop, Bill [<a href="mailto:bbishop@pathfinder-ea.com">mailto:bbishop@pathfinder-ea.com</a>]
<br>
<b>Sent:</b> Wednesday, November 06, 2013 10:17 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I doubt I’m the first to think of this but I don’t recall it being discussed on the List. Simply put, you can model a DOAS system by assigning it to the plenum spaces above occupied spaces, and putting all OA loads in the plenum zones.<o:p></o:p></p>
<p class="MsoNormal">I propose the following workaround for modeling dedicated outdoor air systems (DOAS) in eQUEST/DOE-2.2:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Model all shells/floors with plenum spaces if they are served by a DOAS<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Change the plenum zones ZONE: TYPE to “Conditioned”<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Leave the plenum zone COOL-TEMP-SCH and HEAT-TEMP-SCH as “undefined” (no zone control over the DOAS operation)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Pick DESIGN-COOL-T and DESIGN-HEAT-T values for the plenum zones that match the likely DOAS supply air temperature range<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Create the DOAS as a new SYSTEM (TYPE = [whatever is appropriate])<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Assign the DOAS to the plenum zones above the conditioned zones that it actually serves<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Assign outdoor air only to the plenum zones, representing the outdoor air requirement of the conditioned zones below<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Create/modify internal walls between plenum zones and zones below, making them “Air walls”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This method has the following advantages:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>No exceptional calcs or separate models needed (but see “Conditioned area” comment below)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>All DOAS systems can be modeled as designed, within normal eQUEST constraints<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>A single DOAS system can supply ventilation air to multiple zones/systems<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>DOAS system operation and ventilation supply can be independent of the other systems serving the zones<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Return air temperature to the DOAS closely follows that of the occupied zone, for accurate heat recovery simulation<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Zonal systems “see” the space load from ventilation air that is not supplied at a “zone-neutral” temperature<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>DCV can be modeled, but people need to be assigned to the plenum spaces <u>
instead</u> of the occupied spaces below (which might also be a disadvantage of this method)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>No ventilation load changes need to be made to create the LEED Baseline from the Proposed design model, but the plenum zones need to be assigned to the baseline systems that serve the zones below.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">…but has these disadvantages or does not solve these problems:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Conditioned floor area reported (such as in LS-C) is incorrect. Subtract the area served by the DOAS (as reported on SV-A).<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Latent heat transfer is not simulated across interior walls. Ideally, latent loads should be assigned to the plenum spaces to represent the portion of non-ventilation latent loads handled by the DOAS.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in">-<span style="font-size:7.0pt;font-family:"Times New Roman","serif"">
</span>Plenum space FLOOR-WEIGHT may need to be adjusted for realistic lag time and peak load damping (I haven’t thought this out yet)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please discuss!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black">William Bishop, PE, BEMP, BEAP, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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