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<p class="MsoPlainText">I prefer manual calculations, but if you want to use Trace to do the ventilation calculations then you can set a “Max Vent (Z) Ratio Allowed”. You can try a little trial and error but likely between 30 and 60%.
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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><img width="639" height="543" id="Picture_x0020_1" src="cid:image001.png@01CF7F48.1C2BF750"><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">SCOTT PARKER<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: Trace-users [mailto:trace-users-bounces@lists.onebuilding.org] On Behalf Of Eurek, John S NWO<br>
Sent: Tuesday, June 03, 2014 4:16 PM<br>
To: trace-users@lists.onebuilding.org<br>
Subject: [Trace-users] Percent Outside Air (UNCLASSIFIED)</p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Classification: UNCLASSIFIED<o:p></o:p></p>
<p class="MsoPlainText">Caveats: NONE<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I have an Variable Volume Reheat (30% Min Flow Default) and used the System Ventilation Flag to ASHRAE 62.1 with Vent Rest. When I ran the model the system was running 100% Outside air. I looked at the 62.1 report and saw that there
were corridors and storage rooms driving the 100%, so I set the air flow for those rooms higher. I repeated this process of finding the critical zones and increasing the supply cfm to drive down the outside air percentage.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I've got it down to 43.4%, but is there a better way to accomplish this?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">When I run it with summing outside air requirements, the highest zone is 32% outside air, but the values don't comply with 62.1.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Is the best method just to find the critical zones and increasing the cfms and repeat?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Classification: UNCLASSIFIED<o:p></o:p></p>
<p class="MsoPlainText">Caveats: NONE<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
<p class="MsoPlainText">Trace-users mailing list<o:p></o:p></p>
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