[Equest-users] VAV Fume hood exhaust with Energy Recovery

[Fred Porter]

I'm fairly certain that if the ERV-FAN command is set to SELF-CONTAINED, then the ERV is modeled as receiving both the "general" exhaust (RETURN or RELIEF) fan airflow, and, the zone exhaust airflow. This works fine as long as the none of the other zones on the system have actual return air.
 
It seems the ERV-FANs has a modest bug. Even if the all its keywords are set to enable 24/7 fan operation, these fans are only simulated as running when energy recovery is occurring, which is only about 1/2 to 2/3 of the hours of the year, when the ERV controls are set properly.
Happy Modeling
Fred

>>> "Bouchard, Jordan" <Jordan.Bouchard at stantec.com> 9/3/2009 1:08 PM >>>

Hello,
 
I am currently trying to model a laboratory with VAV fume hoods in eQUEST. The lab exhaust is tied to the general exhaust. When the fume hood demand goes up, the general exhaust goes down, all to maintain a constant overall exhaust and a negative pressure relationship to the neighboring offices. 
 
My problem is that the project is incorporating glycol run-around loops into the exhaust and that heat is routed back to the AHU. If I input the exhaust into the Zone, I understand that I will not realize any heat recovery because only the central exhaust can do that. Is there a way to model this properly or do I have to model the fume hoods in the zone with air-flow tracking and not capture any of the heat recovery savings.
 
Thanks,
Jordan
 
 
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