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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It’s my sense that the nitty-gritty decisions for such cases remain reliant on some subjective interpretation on the modeler’s part. I’ve added my personal
take on your queries </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red">[bracketed and in red]</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> below.
<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">The most solid advice I can offer on the matter is to be clear in your documentation. At the end of the day, whatever course you take may be disagreeable to
your reviewer (even if inconsequential to the results) – so being clear on your interpretation and application of these rules is cheap insurance to save yourself time/effort later, should you have to make a revision and/or explain your approach to others/yourself.<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">~Nick<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"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CF3EBA.78AAEAA0" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">Smith & Boucher Engineers</span><span style="font-size:7.5pt;color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt;color:blue">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue">
</span></u><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"><o:p> </o:p></span></p>
<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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Nick Patsos<br>
<b>Sent:</b> Thursday, March 13, 2014 8:01 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Non-existing cooling Fan power for proposed case<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have an issue modelling spaces not designed with cooling equipment in LEED. The spaces are considered conditioned (occupied) but only heated in reality. The only cooling that is considered can come from natural ventilation or in some
spaces from ERV ventilators.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Since the spaces do not fall in the 'heated storage' category of ASHRAE addenda 'DN', I think its proper to model a system to be the same as baseline, in my case Packaged VAV.<span style="color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red">[Agreed.]</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So, what happens with fan power in the proposed case? What W/cfm should be modelled since this is a hypothetical system (same as baseline - PVAVS)?<span style="color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red">[I would allow the proposed system to autosize airflow, just as the baseline model will (they may appropriately be rather different depending upon varying envelope loads and
such). Proposed fan power (W/CFM) and cooling efficiency (EIR) would be set to match whatever is calculated for the corresponding baseline system. As a point of consistency for documentation, I like to present my “fake proposed” systems’ calculations alongside
my baseline systems’ calculations, with some footnotes to clarify where I’m simply referencing the corresponding baseline system.]</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Furthermore, this can be more complex if considering spaces with ERV ventilators (no cooling), for which I have the W/cfm.
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red">[Agreed!]
</span>Should I include the hypothetical system's fan power for cooling as well?<span style="color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red">[In this scenario, I would use the actual W/CFM (and designed airflow) for the proposed model, and the baseline-calculated Pfan (and autosized airflow) for the baseline model.
Again for the proposed cooling efficiency, match the EIR you come up with for the corresponding baseline system.]</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you in advance.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards<o:p></o:p></p>
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<p class="MsoNormal">Nick Patsos<o:p></o:p></p>
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<p class="MsoNormal">Mechanical Engineer<o:p></o:p></p>
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