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<p class="MsoNormal"><span style="color:#1F497D">Thanks for the reply Aaron. I think Section 6.4 strongly implies, if not requires, Appendix G/LEED models to have zero ventilation during unoccupied hours, per your (our) logic. My particular case is a dormitory
with proposed system of DOAS w/zonal induction units. I will verify the anticipated system fan schedule (which might be 24/7 when class is in session) but if there is any unoccupied fan cycling, the proposed design will be 100% OA and it might not meet any
of the ASHRAE 90.1 exceptions. I could keep the baseline PTACs with the same ventilation rate during unoccupied hours but the actual cumulative ventilation rate will then vary with the number of hours of fan cycling, which will vary between the baseline and
proposed cases due to envelope differences. Therefore, the G3.1.2.5 requirement cannot really be met (which is another reason to argue for no ventilation during fan cycling).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bill<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Dahlstrom, Aaron [mailto:ADahlstrom@in-posse.com]
<br>
<b>Sent:</b> Wednesday, March 07, 2012 10:06 AM<br>
<b>To:</b> Bishop, Bill; Equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: ASHRAE 90.1 Appendix G ventilation when fan cycling<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Bill – an excellent question, one I haven’t looking into too much before…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Here’s a little logic, though:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:12.0pt"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:12.0pt">All LEED buildings are required to meet Section 6.4 in its entirety. (per the pre-requisite language)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:12.0pt"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:12.0pt">The ventilation rates are required to be identical between the proposed and baseline per G3.1.2.5<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:12.0pt"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:12.0pt">If there is a reason why the proposed building would need ventilation during unoccupied hours, both the proposed and the baseline shall have ventilation during those hours per G3.1.2.4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">I think that’s enough logic to make the case for what you’ve proposed. Thoughts?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Aaron<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:150%;text-autospace:none"><b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">Aaron Dahlstrom , PE, LEED® AP</span></b><o:p></o:p></p>
<p class="MsoNormal" style="line-height:150%;text-autospace:none"><b><span style="font-family:"AvantGarde Bk BT";color:#17365D">In P</span></b><b><span style="font-family:"AvantGarde Bk BT";color:#619428">o</span></b><b><span style="font-family:"AvantGarde Bk BT";color:#17365D">sse</span></b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">
– </span><span style="font-size:8.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">A subsidiary of</span><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">
</span><b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:#CC0000">AKF</span></b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">| 1500 Walnut Street, Suite 1414, Philadelphia,
PA 19102 </span><o:p></o:p></p>
<p class="MsoNormal" style="line-height:150%;text-autospace:none"><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray">e: ADahlstrom@in-posse.com | in posse web:
<a href="http://www.in-posse.com/">www.in-posse.com</a> | akf web: <a href="http://www.akfgroup.com/">
www.akfgroup.com</a></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Times New Roman","serif";color:gray"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Tuesday, March 06, 2012 5:02 PM<br>
<b>To:</b> Equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] ASHRAE 90.1 Appendix G ventilation when fan cycling<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I seem to recall that, when fans are cycled during unoccupied periods per G3.1.2.4, ventilation should be zero – at least in the baseline. I have done this before in eQUEST by setting a MIN-AIR-SCH to zero during unoccupied hours. I can’t
find any reference to this requirement in Appendix G. However, in the mandatory provisions section 6.4.3.4.3 Shutoff Damper Controls, “Ventilation
<i>outdoor air</i> dampers shall be capable of automatically shutting off during preoccupancy building warm-up, cool down, and
<i>setback</i>…”<i> </i>(There are exceptions I’m not listing.) Is the general rule that Appendix G and/or LEED models have zero ventilation during unoccupied periods?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Bill<u><o:p></o:p></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black;text-decoration:none"><img border="0" width="481" height="118" id="Picture_x0020_1" src="cid:image001.png@01CCFC4C.00248850"></span></b></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><br clear="all">
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