[Trace-users] Percent Outside Air (UNCLASSIFIED)

[Scott Parker]

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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SCOTT PARKER



-----Original Message-----
From: Trace-users [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S NWO
Sent: Tuesday, June 03, 2014 4:16 PM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Percent Outside Air (UNCLASSIFIED)



Classification: UNCLASSIFIED

Caveats: NONE





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.



I've got it down to 43.4%, but is there a better way to accomplish this?



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.



Is the best method just to find the critical zones and increasing the cfms and repeat?







Classification: UNCLASSIFIED

Caveats: NONE





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