<div dir="ltr">Hi Nick,<div><br></div><div>It was with the custom hourly outputs specific for DOAS systems that I noticed this behaviour. I have no dehumidification controls specified (and no dehumidification reheat energy indicated from my hourly reports). My DOAS fan is set to run 24/7. The hourly reports show a heating load (and corresponding fuel consumption) all hours of the year, even during cooling hours. Using the hourly outputs available, I am unable to find out the source of this heating load...really not sure what to make of it.</div><div><br></div><div>Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 16, 2019 at 1:04 PM Nicholas Caton <<a href="mailto:Nicholas.Caton@se.com">Nicholas.Caton@se.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div class="gmail-m_5651607887398723171WordSection1">
<p class="MsoNormal">Ah sorry, I retract my guess – I read too fast and my eyes locked to Brian’s demonstrative screenshot, which had a hot water loop indicated for heating.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Taking a step back, have you tried some of the custom hourly outputs specific for DOAS systems? It may be helpful to figure out if this gas is being consumed 24/7, in sync with system operations, day vs. night, etc.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">One new thought is that this might be a piece of subcooling and reheat to accomplish dehumidification – something to look out for in those hourlies.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">~Nick<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(58,122,70)"><img width="726" height="9" style="width: 7.5625in; height: 0.0937in;" id="gmail-m_5651607887398723171_x0000_i1025" src="cid:16ac1bc1f5a4cff311"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-family:Arial,sans-serif;color:rgb(58,122,70)">Nick Caton, P.E., BEMP</span></b><span style="color:rgb(58,122,70)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Senior Energy Engineer</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Regional Energy Engineering Manager<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Energy and Sustainability Services</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Energy Performance Contracting
</span><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">D </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">M </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">F </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">E </span><span style="font-size:9pt;color:rgb(31,73,125)">
<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">913 . 564 . 6361<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">785 . 410 . 3317<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">913 . 564 . 6380<u></u><u></u></span></p>
<p class="MsoNormal"><u><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"><a href="mailto:nicholas.caton@se.com" target="_blank"><span style="font-family:Calibri,sans-serif;color:rgb(98,100,105)">nicholas.caton@se.com</span></a></span></u><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:rgb(58,122,70)"><img border="0" width="722" height="49" style="width: 7.5208in; height: 0.5104in;" id="gmail-m_5651607887398723171_x0000_i1026" src="cid:16ac1bc1f5b5b16b22"><u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Nicholas Caton via Equest-users<br>
<b>Sent:</b> Thursday, May 16, 2019 11:00 AM<br>
<b>To:</b> Chris Hadlock <<a href="mailto:cjhadlock@gmail.com" target="_blank">cjhadlock@gmail.com</a>>; Brian Fountain <<a href="mailto:Brian.Fountain@sa-footprint.com" target="_blank">Brian.Fountain@sa-footprint.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Setting DOAS system type airflow rates<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">A fast shotgun guess: Is it possible the boiler(s) serving that hot water loop feature a 5:1 turndown and the loop operation is set to standby, meaning the boiler(s) can’t turn off completely?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">~Nick<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(58,122,70)"><img border="0" width="726" height="9" style="width: 7.5625in; height: 0.0937in;" id="gmail-m_5651607887398723171Picture_x0020_3" src="cid:16ac1bc1f5a4cff311"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-family:Arial,sans-serif;color:rgb(58,122,70)">Nick Caton, P.E., BEMP</span></b><span style="color:rgb(58,122,70)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Senior Energy Engineer</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Regional Energy Engineering Manager<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Energy and Sustainability Services</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"> Energy Performance Contracting
</span><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">D </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">M </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(87,176,105)">F </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)"><br>
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<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">913 . 564 . 6361<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">785 . 410 . 3317<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">913 . 564 . 6380<u></u><u></u></span></p>
<p class="MsoNormal"><u><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)"><a href="mailto:nicholas.caton@se.com" target="_blank"><span style="font-family:Calibri,sans-serif;color:rgb(98,100,105)">nicholas.caton@se.com</span></a></span></u><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(98,100,105)">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="font-size:9pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:rgb(58,122,70)"><img border="0" width="722" height="49" style="width: 7.5208in; height: 0.5104in;" id="gmail-m_5651607887398723171_x0000_i1028" src="cid:16ac1bc1f5b5b16b22"><u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Chris Hadlock via Equest-users<br>
<b>Sent:</b> Thursday, May 16, 2019 9:16 AM<br>
<b>To:</b> Brian Fountain <<a href="mailto:Brian.Fountain@sa-footprint.com" target="_blank">Brian.Fountain@sa-footprint.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Setting DOAS system type airflow rates<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">For my most recent project for which I have a DOAS system, I've noticed a constant (8760 hrs) heating energy consumption. I've got the DOAS set up as a gas-fired furnace and DX cooling coil. I've set my auxiliary fuel consumption set to
0 and no preheat. During the summer where there is active cooling my furnace is running at about 19% of it's design capacity (simultaneous heating and cooling). Has anyone noticed their DOAS system doing this? Any suggestions?
<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thanks,<u></u><u></u></p>
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<p class="MsoNormal">Chris<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Wed, May 15, 2019 at 9:52 AM Brian Fountain via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="color:rgb(31,73,125)">Hi Chris.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Yes – you can explicitly set the heating and/or cooling capacities of the DOAS system type.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><img border="0" width="654" height="325" style="width: 6.8125in; height: 3.3854in;" id="gmail-m_5651607887398723171gmail-m_-6536249796350194646_x005f_x0000_i1029" src="cid:16ac1bc1f5b6917eb3"><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Cheers,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Brian</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<div>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%">
<b><span style="font-size:12pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Footprint<br>
<br>
</span></b><b><span style="font-size:10pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Brian Fountain<br>
</span></b><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">Associate<br>
</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">d
</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 572 8501</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)"> m
</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 562 6831</span><u></u><u></u></p>
</div>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Jones, Christopher via Equest-users<br>
<b>Sent:</b> Wednesday, May 15, 2019 8:39 AM<br>
<b>To:</b> Bishop, Bill <<a href="mailto:bbishop@pathfinder-ea.com" target="_blank">bbishop@pathfinder-ea.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Setting DOAS system type airflow rates<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Times New Roman",serif">CAUTION: EXTERNAL SENDER
</span><u></u><u></u></p>
<div>
<p class="MsoNormal">Thanks Bill,<u></u><u></u></p>
<p class="MsoNormal">Re. DOAS coils – is there an option to specifically size the coils?
<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10pt;font-family:Arial,sans-serif">Christopher R Jones, P.Eng.</span></b><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif">T+ 1 416-644-0252</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:8pt;font-family:Arial,sans-serif"> </span><u></u><u></u></p>
<p class="MsoNormal"><img border="0" width="60" height="29" style="width: 0.625in; height: 0.302in;" id="gmail-m_5651607887398723171gmail-m_-65362497963501946461cc2331b-d8c3-424e-81de-2b17716d444e.png_x003f_ver_x003d_1495657656000" src="cid:16ac1bc1f5b7745b44"><u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<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 <<a href="mailto:Brian.Fountain@sa-footprint.com" target="_blank">Brian.Fountain@sa-footprint.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Setting DOAS system type airflow rates<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></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.<u></u><u></u></p>
<p class="MsoNormal">Some additional observations:<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:0.5in">
-<span style="font-size:7pt;font-family:"Times New Roman",serif"> </span>
If you enter the DOAS SUPPLY-FLOW (Design cfm): <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:1in">
<span style="font-family:"Courier New"">o</span><span style="font-size:7pt;font-family:"Times New Roman",serif">
</span>The design fan power will be based on the SUPPLY-FLOW multiplied by SUPPLY-KW/FLOW (if entered).<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:1in">
<span style="font-family:"Courier New"">o</span><span style="font-size:7pt;font-family:"Times New Roman",serif">
</span>Any central airhandler coils will be autosized based on the SUPPLY-FLOW. (See the SV-C report in the SIM file.)<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:0.5in">
-<span style="font-size:7pt;font-family:"Times New Roman",serif"> </span>
If instead, you let the DOAS SUPPLY-FLOW (Design cfm) default by leaving it blank:
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:1in">
<span style="font-family:"Courier New"">o</span><span style="font-size:7pt;font-family:"Times New Roman",serif">
</span>The design fan power will be based on the design ventilation rate determined by the served systems multiplied by SUPPLY-KW/FLOW (if entered).<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:1in">
<span style="font-family:"Courier New"">o</span><span style="font-size:7pt;font-family:"Times New Roman",serif">
</span>Any central airhandler coils will be autosized based on the design ventilation rate.<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:0.5in">
-<span style="font-size:7pt;font-family:"Times New Roman",serif"> </span>
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.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">~Bill<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP</span></b><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:9pt;font-family:Arial,sans-serif;color:black">Senior Energy Engineer</span></b><u></u><u></u></p>
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<p class="MsoNormal"><u></u><img width="91" height="59" style="width: 0.9479in; height: 0.6145in;" src="cid:16ac1bc1f5b8546ed5" align="left" hspace="12" alt="Pathfinder-EA-logo-2"><u></u><b><i><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(0,32,96)">T:
(585) 698-1956</span><span style="color:rgb(0,32,96)"> </span></i></b><span style="color:rgb(31,73,125)"> </span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">F: (585) 325-6005</span><u></u><u></u></p>
<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com" target="_blank"><span style="font-size:9pt;font-family:Arial,sans-serif">bbishop@pathfinder-ea.com</span></a><span style="font-size:9pt;font-family:Arial,sans-serif;color:black"> </span><a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.pathfinder-ea.com%2F&data=02%7C01%7CNicholas.Caton%40se.com%7Cf8a85f5edc2c42cdb59508d6da17969f%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636936192180474764&sdata=ZxSS6IfOqstH6v3zU5dyJpYkPxBde709aBQo0vu81KU%3D&reserved=0" target="_blank"><span style="font-size:9pt;font-family:Arial,sans-serif">www.pathfinder-ea.com</span></a><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">134 South Fitzhugh Street</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">Rochester, NY 14608
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</span><i><span style="font-size:7pt;font-family:Verdana,sans-serif;color:rgb(0,176,240)">Ask me why Carbon Fee & Dividend may be right for you.</span></i><u></u><u></u></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">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" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Setting DOAS system type airflow rates<u></u><u></u></p>
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<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.
<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></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. <u></u><u></u></p>
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<p class="MsoNormal"><img border="0" width="771" height="316" style="width: 8.0312in; height: 3.2916in;" id="gmail-m_5651607887398723171gmail-m_-6536249796350194646Picture_x0020_1" src="cid:16ac1bc1f5ba175ef7"><u></u><u></u></p>
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<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.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Today’s lesson – define outdoor air rates properly, and hourly reports are your friend.<u></u><u></u></p>
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<b><span style="font-size:12pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Footprint<br>
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</span></b><b><span style="font-size:10pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Brian Fountain
</span></b><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">P.Eng., LEED AP BD+C, BEMP<br>
Associate<br>
<a href="mailto:Brian.Fountain@sa-footprint.com" target="_blank">Brian.Fountain@sa-footprint.com</a><br>
<br>
100 Sheppard Ave Suite 800 Toronto Ontario M2N 6Z1<br>
</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,104,146)">t
</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 218 7025
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</span><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 487 9104
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