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<p class="MsoNormal">Thanks Bill,<o:p></o:p></p>
<p class="MsoNormal">Re. DOAS coils – is there an option to specifically size the coils?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Christopher R Jones, P.Eng.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">T+ 1 416-644-0252<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><img width="60" height="29" style="width:.625in;height:.302in" id="_x0031_cc2331b-d8c3-424e-81de-2b17716d444e.png_x003f_ver_x003d_1495657656000" src="cid:image001.png@01D50AF9.94BCE700"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Bishop, Bill via Equest-users<br>
<b>Sent:</b> Tuesday, May 14, 2019 2:02 PM<br>
<b>To:</b> Brian Fountain <Brian.Fountain@sa-footprint.com><br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Setting DOAS system type airflow rates<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Brian! You make an important point on design sizing of DOAS systems – the hourly ventilation rate is determined by the systems/zones that the DOAS serves, and the corresponding ventilation controls for those systems.<o:p></o:p></p>
<p class="MsoNormal">Some additional observations:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo3">If you enter the DOAS SUPPLY-FLOW (Design cfm):
<o:p></o:p>
<ul style="margin-top:0in" type="circle">
<li class="MsoNormal" style="mso-list:l0 level2 lfo3">The design fan power will be based on the SUPPLY-FLOW multiplied by SUPPLY-KW/FLOW (if entered).<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level2 lfo3">Any central airhandler coils will be autosized based on the SUPPLY-FLOW. (See the SV-C report in the SIM file.)<o:p></o:p></li></ul>
</li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">If instead, you let the DOAS SUPPLY-FLOW (Design cfm) default by leaving it blank:
<o:p></o:p>
<ul style="margin-top:0in" type="circle">
<li class="MsoNormal" style="mso-list:l0 level2 lfo3">The design fan power will be based on the design ventilation rate determined by the served systems multiplied by SUPPLY-KW/FLOW (if entered).<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level2 lfo3">Any central airhandler coils will be autosized based on the design ventilation rate.<o:p></o:p></li></ul>
</li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">If you enter zone ventilation as OA/FLOW-PER (cfm per person), to simulate DCV or to size the ventilation per ASHRAE 62.1 guidelines, the design ventilation rate will be based on the highest hourly value
in the occupancy schedule. So you have to have at least one hour with 1.0 occupancy either in the weekday, weekend and/or CDD/HDD schedules. Otherwise, the design ventilation rate will be reduced.<o:p></o:p></li></ul>
<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>
<div>
<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<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:3.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></b></p>
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(585) 698-1956</span><span style="color:#002060"> </span></i></b><span style="color:#1F497D"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">F: (585) 325-6005<o:p></o:p></span></p>
<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">bbishop@pathfinder-ea.com</span></a><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"> </span><a href="http://www.pathfinder-ea.com/"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">www.pathfinder-ea.com</span></a><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">Rochester, NY 14608
<img border="0" width="26" height="23" style="width:.2708in;height:.2395in" id="_x0000_i1025" src="cid:image006.png@01D50AF9.94B6A570">
</span><i><span style="font-size:7.0pt;font-family:"Verdana",sans-serif;color:#00B0F0">Ask me why Carbon Fee & Dividend may be right for you.</span></i><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Brian Fountain via Equest-users<br>
<b>Sent:</b> Monday, May 13, 2019 5:47 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Setting DOAS system type airflow rates<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Caution note when using DOAS systems – you cannot simply define the OA volume in the flow parameters tab of the DOAS fan.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In DOE-2.3, there is now a system type ‘DOAS’ that will properly provide outdoor air either directly to zones or to the mixing section of the system it serves. The volume of outdoor air delivered by this system is determined by the outdoor
air flow rates of the zones that take air from this system. The screenshot below suggests that the unit will be delivering 6,545 cfm of OA but in fact this system was only delivering 500 cfm as the served zones did not have their OA volumes set properly.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img border="0" width="771" height="316" style="width:8.0312in;height:3.2916in" id="Picture_x0020_1" src="cid:image007.jpg@01D50AF9.94B6A570"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When the OA was defined in the zones taking air from this system, the volume of OA in the DOAS was as expected.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Today’s lesson – define outdoor air rates properly, and hourly reports are your friend.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:105%"><b><span style="font-size:12.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892">Footprint<br>
<br>
</span></b><b><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892">Brian Fountain
</span></b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#967264">P.Eng., LEED AP BD+C, BEMP<br>
Associate<br>
<a href="mailto:Brian.Fountain@sa-footprint.com">Brian.Fountain@sa-footprint.com</a><br>
<br>
100 Sheppard Ave Suite 800 Toronto Ontario M2N 6Z1<br>
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892">t
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#967264">416 218 7025
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892">f
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#967264">416 487 9104 sa-footprint.com<br>
<br>
Vancouver Calgary Edmonton Winnipeg Kitchener</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892"> Toronto</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#967264">
Ottawa</span><span style="font-size:8.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#967264"><o:p></o:p></span></p>
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