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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Sunayana,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Use Pkgd Single Zone (PSZ) systems to model Appendix G PTACs. You will need to create one PSZ system per zone which might mean 100+ systems for your 6-story apartment
building. Floor multipliers are probably in order.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The PTAC fan power of 0.0003 kW/cfm includes ERVs. I’m not aware of an exception to Appendix G that would apply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">There are a few possibilities for justifying no ERV in the baseline:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ventilation system runs <8000 hrs/year (hard to justify for apartments?)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The building is a multipurpose use and you can model additional system types in the nonresidential areas<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">6.5.6.1 exception (8.), “where the largest source of air exhausted at a single location at the building exterior is less than 75% of the design outdoor
airflow rate”. This would seem to apply, since each PTAC handles the ventilation load for one zone, and the baseline would have no large common exhaust location.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<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
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D">
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:blue">bbishop@pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">
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<p class="MsoNormal" style="margin-top:3.0pt;line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="34" height="32" id="Picture_x0020_5" src="cid:image009.png@01D3B6DD.8A5D3BF0" alt="http://png-5.findicons.com/files/icons/977/rrze/720/globe.png"></span><span style="font-size:7.5pt;line-height:105%;font-family:"Calibri",sans-serif;color:#00B0F0">Carbon
Fee and Dividend - simple, effective, and market-based.</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>sunayana jain via Equest-users<br>
<b>Sent:</b> Thursday, March 08, 2018 11:16 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] exhaust heat recovery system with PTAC in eQUEST<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-serif">As per ASHRAE 90.1-2013, exhaust air energy recovery is required for ventilation systems operating greater than
8000 hours per year. I am working on a baseline model of 6 storeys apartment building in climate zone 5A. As per ASHRAE 90.1-2013 Appendix G, apartments units are required to have PTAC systems with heat recovery. I am wondering, how to model PTAC with heat
recovery in eQUEST. PTAC system cannot take heat recovery in eQUEST. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-serif">Also, ASHRAE does not have any information on fan power for energy recovery systems. Should the ERV fan be a part
of allowable 0.0003 kW/cfm fan power?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-serif">Any suggestions will be appreciated.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-serif">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-serif">Sunayana Jain<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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