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<p class="MsoNormal">Konstantina, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<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.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<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.
<o:p></o:p></p>
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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.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<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.
<o:p></o:p></p>
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<p class="MsoNormal">Hope that makes sense. <o:p></o:p></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.
<o:p></o:p></p>
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<p class="MsoNormal">Good luck. <o:p></o:p></p>
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<p class="MsoNormal">Fred<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;color:#660000;text-transform:uppercase">Fred Betz</span></b><b><span style="font-size:9.0pt;color:#333333">
</span></b><span style="font-size:9.0pt;color:#333333">PhD, LEED® AP BD+C<br>
</span><span style="font-size:10.0pt;color:#333333;text-transform:uppercase">Building Performance</span><span style="font-size:9.0pt;color:#333333"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:9.0pt;color:#660000">AEI</span></b><span style="font-size:9.0pt;color:#333333"> | AFFILIATED ENGINEERS, INC. <br>
5802 Research Park Boulevard | Madison, WI 53719<br>
<br>
</span><span style="font-size:9.0pt;color:#660000">P: 608.236.1175 | F: 608.238.2614</span><span style="font-size:9.0pt;color:#333333"> <br>
</span><span style="font-size:9.0pt;color:#660000"><a href="mailto:fbetz@aeieng.com"><span style="color:#660000;text-decoration:none">fbetz@aeieng.com</span></a> |
<b><a href="http://www.aeieng.com/"><span style="color:#660000;text-decoration:none">www.aeieng.com</span></a></b></span><span style="font-size:9.0pt;color:#333333"> <br>
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<p class="MsoNormal"><b>From:</b> Konstantina Kalliakoudi <kalliakoudi.k@gmail.com>
<br>
<b>Sent:</b> Wednesday, February 5, 2020 3:55 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Control of Energy Recovery System in the Baseline Building on ASHRAE 90.1-2010 Simulated<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:150%">Hello to all equest -users,<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:150%">I am trying to model my Baseline building based on ASHRAE 90.1-2010.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:150%">In my case:<o:p></o:p></p>
<p class="gmail-msolistparagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;line-height:150%">
1.<span style="font-size:7.0pt;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.<o:p></o:p></p>
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2.<span style="font-size:7.0pt;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.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;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”.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:150%">The tables of 6.5.1.1, Table 6.5.1.1A and B mention about control of Economizer.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;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.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:150%">I have modeled this in equest as following: What do you think;<o:p></o:p></p>
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<p class="MsoNormal">Thank you<o:p></o:p></p>
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<p class="MsoNormal">Konstantina Kalliakoudi<o:p></o:p></p>
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<p class="MsoNormal">Konstantina Kalliakoudi<o:p></o:p></p>
<p class="MsoNormal">Mechanical Engineer,M.Sc., <o:p></o:p></p>
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