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<p class="MsoNormal">Hi Paul,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To my knowledge, there’s no explicit option in equest for tying a fan/process energy to an interior/exterior humidity state. Some pre-processing/work outside your model would be necessary.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You could do an analysis separately in excel (ideally informed with field measurements of an existing/built situation) with intent to ultimately estimate fan runtime, and then “spoon feed” the outcome of your efforts into an eQuest model
in the form of a fan schedule and some power inputs at the meter. The likes of EMIT can make the transition from spreadsheet efforts easier.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I might however first want to take a step back and draw caution towards understanding more of the context behind this measure… I’m reminded that Mr. Lstiburek’s articles in the ASHRAE journals and beyond (hosted here:
<a href="https://buildingscience.com/document-search">https://buildingscience.com/document-search</a> <-- you can filter results by ticking the box for “Crawlspaces”) repeatedly warn against passively/actively ventilating building crawlspaces to/from the exterior.
It’s my general sense that active ventilation with exterior conditions can generally cause more problems than it solves with regard to humidity/moisture issues. If however we’re talking about circulation of conditioned (interior) air and treating the crawlspace
like a conditioned/sealed basement, that’s approaching an “ideal” state WRT moisture control.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I hope this is a little helpful!<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:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="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>Paul Diglio via Equest-users<br>
<b>Sent:</b> Tuesday, September 11, 2018 8:07 AM<br>
<b>To:</b> equest-users@onebuilding.org<br>
<b>Subject:</b> [Equest-users] Exhaust Fan for Humidity Control<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Hi All:<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Is there anyway to model an exhaust fan that only runs when the humidity in a crawl space is above a certain setpoint?<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Paul Diglio<br>
87 Fairmont Avenue <br>
New Haven, CT 06513 <br>
<br>
<o:p></o:p></span></p>
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