[Equest-users] Fwd: Exhaust Fans

[Simge Andolsun]

Another option can be balancing the high amount of air extracted from the
zone with infiltration instead of from the air handler, but I believe this
would increase the number of unmet hours in the system. As per Appendix G,
the total unmet hours of the baseline and as-built models need to be 300 or
less. Thus, this option did not seem like a good approach to me as well.

Thank you very much,
Best Regards,
S.Andolsun, PhD


---------- Forwarded message ----------
From: Simge Andolsun <simgeandolsun at gmail.com>
Date: Tue, Nov 12, 2013 at 9:52 AM
Subject: Exhaust Fans
To: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org
>


Dear eQuest users,

I am trying to model a lab building in compliance with ASHRAE 90.1 to
compare it with an as built model that represents the real case as
described in Appendix G. The actual building (the as built model) has a few
zones which have exhaust air flow rate higher than supply air flow rate as
per the building schedules. I unfortunately do not have any information
regarding the operation schedule of the exhaust fans. When I model the
exhaust air flow rates of these zones to be always lower than the zone
supply air flow rate, then the actual building is not represented closely
enough. When I increase the zone supply air flow rate such that it is
always equal to the actual exhaust air flow rate, then the zone air flow
rate is assumed to be higher than it actually is increasing the overall
energy consumption of the building. eQuest does not allow for the exhaust
air flow rate of a zone to be higher than the supply air flow rate which
would result in high unmet hours in the zone. In order to make a reasonable
comparison between the baseline and the as built models as per Appendix G,
how do you think I should represent the exhaust fans in these two models?
and why? Would you also explain the settings I should use in eQuest to
model the case you are suggesting? I would appreciate it very much.

Thank you very much,
Best Regards,
S.Andolsun, PhD
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