<div dir="ltr">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?<div><br></div><div>Thanks,</div><div>Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 15, 2019 at 9:52 AM Brian Fountain via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</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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<p class="MsoNormal"><span style="color:rgb(31,73,125)">Hi Chris.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><img width="654" height="325" style="width: 6.8125in; height: 3.3854in;" id="gmail-m_-6536249796350194646_x0000_i1029" src="cid:16ac0f899e65b006a4"><span style="color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Cheers,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Brian<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:8pt;line-height:106%"><b><span style="font-size:12pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Footprint<br>
<br>
</span></b><b><span style="font-size:10pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(0,104,146)">Brian Fountain<br>
</span></b><span style="font-size:9pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(150,114,100)">Associate<br>
</span><span style="font-size:9pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(0,104,146)">d
</span><span style="font-size:9pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 572 8501</span><span style="font-size:9pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(0,104,146)"> m
</span><span style="font-size:9pt;line-height:106%;font-family:Arial,sans-serif;color:rgb(150,114,100)">416 562 6831<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></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>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>
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<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
<u></u><u></u></span></p>
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<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>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:Arial,sans-serif">Christopher R Jones, P.Eng.<u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif">T+ 1 416-644-0252<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8pt;font-family:Arial,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><img width="60" height="29" style="width: 0.625in; height: 0.302in;" id="gmail-m_-6536249796350194646_x0031_cc2331b-d8c3-424e-81de-2b17716d444e.png_x003f_ver_x003d_1495657656000" src="cid:16ac0f899e6855d351"><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">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">
<u></u><span>-<span style="font:7pt "Times New Roman"">
</span></span><u></u>If you enter the DOAS SUPPLY-FLOW (Design cfm): <u></u><u></u></p>
<p class="MsoNormal" style="margin-left:1in">
<u></u><span style="font-family:"Courier New""><span>o<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>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">
<u></u><span style="font-family:"Courier New""><span>o<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>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">
<u></u><span>-<span style="font:7pt "Times New Roman"">
</span></span><u></u>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">
<u></u><span style="font-family:"Courier New""><span>o<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>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">
<u></u><span style="font-family:"Courier New""><span>o<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>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">
<u></u><span>-<span style="font:7pt "Times New Roman"">
</span></span><u></u>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>
<div>
<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<u></u><u></u></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9pt;font-family:Arial,sans-serif;color:black">Senior Energy Engineer<u></u><u></u></span></b></p>
<p class="MsoNormal"><b><span style="font-size:3pt;font-family:Arial,sans-serif;color:black"><u></u> <u></u></span></b></p>
<p class="MsoNormal"><u></u><img width="91" height="59" style="width: 0.9479in; height: 0.6145in;" src="cid:16ac0f899e6772f6c5" 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<u></u><u></u></span></p>
<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com" target="_blank"><span style="font-size:9pt;font-family:Arial,sans-serif;color:blue">bbishop@pathfinder-ea.com</span></a><span style="font-size:9pt;font-family:Arial,sans-serif;color:black"> </span><a href="http://www.pathfinder-ea.com/" target="_blank"><span style="font-size:9pt;font-family:Arial,sans-serif;color:blue">www.pathfinder-ea.com</span></a><span style="color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">134 South Fitzhugh Street<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">Rochester, NY 14608
<img border="0" width="26" height="23" style="width: 0.2708in; height: 0.2395in;" id="gmail-m_-6536249796350194646_x0000_i1026" src="cid:16ac0f899e61f3c04f2">
</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><span style="color:rgb(31,73,125)"><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"><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>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></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.
<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>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><img border="0" width="771" height="316" style="width: 8.0312in; height: 3.2916in;" id="gmail-m_-6536249796350194646Picture_x0020_1" src="cid:16ac0f899e6201c1883"><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></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.<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>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-bottom:12pt;line-height:105%"><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
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Associate<br>
<a href="mailto:Brian.Fountain@sa-footprint.com" target="_blank">Brian.Fountain@sa-footprint.com</a><br>
<br>
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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 <a href="http://sa-footprint.com" target="_blank">sa-footprint.com</a><br>
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