<div dir="ltr">Hi Fred,<div><br></div><div>thank you for your answer.</div><div><br></div><div>So if I understood right ,the baseline building is with bypass of the enthalpy wheel and with no economizer. And yes, this make sense.</div><div><br></div><div><div>Thank you</div><div><br></div><div>Konstantina Kalliakoudi</div><div><br></div><div><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Konstantina Kalliakoudi</span></p><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">Mechanical Engineer,M.Sc., </span></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Στις Πέμ, 6 Φεβ 2020 στις 6:23 μ.μ., ο/η Fred Betz <<a href="mailto:fbetz@aeieng.com">fbetz@aeieng.com</a>> έγραψε:<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">Konstantina, <u></u><u></u></p>
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<p class="MsoNormal">It’s not a contradiction as your wheel is only seeing your outdoor flow whereas an economizer would see more air flow.
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<p class="MsoNormal">If you’re 30% outside air at 10,000 cfm you have 3,000 cfm bypassing the wheel. The other 7,000 cfm are being returned and never see the wheel.
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<p class="MsoNormal">If you had an economizer you might get up to twice that flow rate when it’s 65F-75F depending on your location’s economizer requirements.
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<p class="MsoNormal">Yes, it’s economizing, a little but not enough to meet the full requirements of an air-side economizer. The intent here is primarily to avoid the pressure drop of the wheel while not recovering heat.
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<p class="MsoNormal">Hope that makes sense. <u></u><u></u></p>
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<p class="MsoNormal">Dig into the hourly flow rates and loads to determine that’s working properly as the controls can get wonky.
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<p class="MsoNormal">Good luck. <u></u><u></u></p>
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<p class="MsoNormal">Fred<u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(102,0,0);text-transform:uppercase">Fred Betz</span></b><b><span style="font-size:9pt;color:rgb(51,51,51)">
</span></b><span style="font-size:9pt;color:rgb(51,51,51)">PhD, LEED® AP BD+C<br>
</span><span style="font-size:10pt;color:rgb(51,51,51);text-transform:uppercase">Building Performance</span><span style="font-size:9pt;color:rgb(51,51,51)"><u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:9pt;color:rgb(102,0,0)">AEI</span></b><span style="font-size:9pt;color:rgb(51,51,51)"> | AFFILIATED ENGINEERS, INC. <br>
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<p class="MsoNormal"><b>From:</b> Konstantina Kalliakoudi <<a href="mailto:kalliakoudi.k@gmail.com" target="_blank">kalliakoudi.k@gmail.com</a>>
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<b>Sent:</b> Wednesday, February 5, 2020 3:55 AM<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] Control of Energy Recovery System in the Baseline Building on ASHRAE 90.1-2010 Simulated<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">Hello to all equest -users,<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">I am trying to model my Baseline building based on ASHRAE 90.1-2010.<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">In my case:<u></u><u></u></p>
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1.<span style="font-size:7pt;line-height:150%;font-family:"Times New Roman",serif">
</span>In my case based on paragraph G3.1.2.11 and in accordance with Section 6.5.6.1 due to the climate zone and the %outdoor air at full design airflow rate “my baseline building” require Heat Recovery System.<u></u><u></u></p>
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2.<span style="font-size:7pt;line-height:150%;font-family:"Times New Roman",serif">
</span>Due to the climate Zone from Table G3.1.2.6A an Economizer is not required.<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">My question is about the control of the heat exchanger in the baseline building. In paragraph 6.5.6.1 is mentioned: “Provisions shall be made to bypass or control the energy recovery system to
permit air economizer operation as required by 6.5.1.1”.<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">The tables of 6.5.1.1, Table 6.5.1.1A and B mention about control of Economizer.<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">Also is in the baseline building required an economizer required or not? I mean, Table G3.1.2.6A and tables 6.5.1.1A and B seems to be in contradiction.<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:150%">I have modeled this in equest as following: What do you think;<u></u><u></u></p>
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<p class="MsoNormal">Thank you<u></u><u></u></p>
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<p class="MsoNormal">Konstantina Kalliakoudi<u></u><u></u></p>
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<p class="MsoNormal">Konstantina Kalliakoudi<u></u><u></u></p>
<p class="MsoNormal">Mechanical Engineer,M.Sc., <u></u><u></u></p>
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