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<p class="MsoNormal"><span style="color:#1F497D">Keith,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for your suggestions! I like your idea of putting the runaround coil first to prevent wheel frosting, and your idea of putting the wheel and coil in parallel (though that would eliminate the benefit of
preventing wheel frost). The AHU as currently designed has bypass dampers for economizer mode and having the wheel and coil in parallel would add even more complexity, but I’ll run the idea by the engineer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Yes, the glycol preheat coil is to ensure 55F mixed air temperature.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<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>From:</b> Keith Swartz [mailto:KSwartz@seventhwave.org] <br>
<b>Sent:</b> Friday, December 11, 2015 5:33 PM<br>
<b>To:</b> Bishop, Bill <bbishop@pathfinder-ea.com>; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] Energy recovery with wheel and runaround loop coil?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Bill,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I think there is some advantage to have the runaround coil before the wheel to reduce frosting. (Think of the processes on a psychrometric diagram.) I think this arrangement
will be easier to control too. Let the less-controllable runaround loop do its thing first and then use the more-controllable wheel to finish the job without overheating.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">What is the purpose of the glycol preheat coil? Is it for frost protection or to bring the temperature up to 55F when needed? If it’s for temperature control then I would put
it downstream of the energy recovery devices. If it’s for frost protection on the wheel then I would put it upstream of the wheel and downstream of the runaround coil.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">The air imbalance between outside air and exhaust air is pretty significant. What do you think about putting the wheel and runaround coil in parallel, splitting the outside air
stream so that the flows through each are more balanced? The wheel could be smaller then, which could make room for the runaround coil.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Keith Swartz, PE
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:gray">|
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:110%"><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">Seventhwave</span></b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:gray"> |
</span><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:#5F5F5F">Madison.Chicago.Minneapolis</span></b><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:gray"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:110%"><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">608.210.7123 seventhwave.org<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Bishop, Bill [<a href="mailto:bbishop@pathfinder-ea.com">mailto:bbishop@pathfinder-ea.com</a>]
<br>
<b>Sent:</b> Friday, December 11, 2015 1:06 PM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Energy recovery with wheel and runaround loop coil?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’d appreciate comments on how to maximize the energy savings from using a runaround loop coil and energy recovery wheel in series.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m modeling a lab HVAC air handler that has an energy wheel and return/exhaust fan at the air handler but where 1/3 to ½ of the OA is exhausted elsewhere (a dedicated fume hood exhaust system). The designer is considering an option for
additional heat recovery via a runaround loop with glycol coils at the fume hood exhaust and the air handler OA stream. This is in a heating-dominated climate (CZ 6A) and the SAT will be 55F.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Any thoughts on how to arrange the coils in the OA stream, which will also include a glycol preheat coil and a CHW coil? (Runaround coil -> wheel -> preheat coil -> CHW coil?)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>How to control the system? (Activate and modulate the wheel first; activate the runaround loop when OAT drops below the point that wheel can maintain the mixed air temperature?)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I assume the pumping power for the runaround loop would be higher than the motor power for rotating the wheel.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks!<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, CEM, 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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