[EnergyPlus_Support] Re: VAV Outside Air Minimums

["asheaffe" <sheaffer@xxxxxxx>]

After reading some more documentation, I think I understand that 
there is no specific way to make sure that the minimum OA air flows 
are met if the system flow drops below the min OA rate.  With this 
in mind, is there any way to specify the minimum flow rate in the 
system in terms of mass flow rate or volume flow rate (not the 
fraction of max flow rate that is currently called for in the SINGLE 
DUCT: VAV: REHEAT object)?

Andrew





--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "asheaffe" <sheaffer@...> 
wrote:
>
> I am having trouble getting my outside air minimum levels right 
for 
> a VAV system.  I have set the minimum system OA limits up, but the 
> results show that the OA flow is less than the minimum amount I 
put 
> in the CONTROLLER: OUTSIDE AIR.  Is there anywhere that I can put 
in 
> the min flow/person for each zone?
> 
> The larger issue is if I have the maximum flow to the zone 
> autosized, the how do I ensure that I allow the minimum flow to be 
> as low as possible while still ensuring adequate OA flow?  For the 
> minimum flow per zone as defined in SINGLE DUCT: VAV: REHEAT, I 
have 
> to assign a fraction of the autosized maximum.  However, since I 
> don't know what the maximum is, I have no idea what fraction must 
be 
> input to ensure minimum OA requirements are met in the zone.  Is 
> there any other way to make sure the min OA is met without going 
> back into the IDF with the results of the sizing runs and inputing 
> the max flow by hand and then calculating the min flow fraction 
and 
> inputting that by hand?
> 
> 
> Thanks,
> 
> Andrew
>





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