[Trace-users] Percent Outside Air (UNCLASSIFIED)

[Michael Hardy]

I usually delete the ventilation rates for those non-critical "critical"
areas so they don't drive the minimum OSA settings.  Janitor's closets are
the worst, but then I use transfer air and exhaust for those which isn't
modeled very well anyway.

Michael L. Hardy, PE, F.NSPE 
Black Oak Engineering, Inc.
Cell 503.314.5244 


-----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 1:16 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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