[BLDG-SIM] VAV fume hood exhaust

[Greg Schlegel]

Hi Renee-

Regarding your question, I went through the same situation recently using VisualDOE (DOE2.1).
First with 100% OA, the return fan will act as the exhaust fan.  Since labs with fumehoods are typically
exhaust driven I sized the supply air cfm according to the fumehood capacity.  Usually a lab won't operate
with  fumehoods running at full capacity 24-7 and some assuptions have to made regarding a diversity factor.
I found two ways to implement this:
1 - alter the defined supply air amount to model a CV system 
2 - in the DOE2 input file add a schedule to min-cfm-ratio to alter the minimum damper position, but this gets a little tricky to get exactly what you want...

I have more experience in TRNSYS than DOE2 and I opted to go in that direction.
TRNSYS lets you define all of your system components and schedules.  This makes set-up a little more
complex, but the final product is exactly what you need...hopefully ;) 

Greg

Gregory O.Schlegel
Mechanical Systems
Affiliated Engineers Inc
5802 Research Park Blvd
Madison, WI 53719

608.236.1150
gschlegel at aeieng.com

>>> "Azerbegi, Renee" <razerbegi at rmhgroup.com> 03/19/04 10:13AM >>>
Has anyone modeled a VAV fume hood exhaust for a laboratory in eQuest? Since the laboratory requires 100% outside air, a return fan is not simulated obviously. The exhaust fan part on the air-handling unit fan page of eQuest doesn't seem to be able to be modeled. If I put the exhaust in each zone, then I can't specify that the fans are VAV. Please let me know if you have had luck with modeling this type of system in eQuest.
Thanks,
Renee
 
 
Renee Azerbegi
RMH Group
Lakewood, Colorado
303-239-0909
 
 
 


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