[EnergyPlus_Support] outside minimum flow

[Zhen Tian <tianzhen9@xxxxxxxxx>]

Hi, All:
 
I have a question for using the object "Controller: outside air".  In this object, I am not sure how to input the field "minimum outside flow rate" combined with "minimum limit" field(fixed or proportional), even I looked up the reference.
 
The following is what I am thinking:
Assuming the system design maximum airflow rate is 6 m3/s; with 80 occupants; each zone minimum airflow ratio 0.3 (VAV system); the sum of total maximum airflow rate for all zones is 7 m3/s (it is bigger than system airflow rate). Set minimum airflow rate for each occupant 8L/s
 
If I use "fixed minimum", then the minimum outside air flow rate should be: 80*0.008=0.64 m3/s. The maximum outside flow is 6m3/s.  Is this correct?
 
If I chose "proportional minimum", and set the ratio of outside air flow rate to system air flow rate also as 0.3.  What should be the minimum outside air flow in this field?  To my understanding, it should be
7 (sum of total air flow)* 0.3 (zone minimum air flow)* 0.3 (outside airflow to system airflow ratio)=0.63 m3/s.  So should input 0.63 into the "minimum outside air flow rate" field.
Is this method correct?
 
Any response will be highly appreciated.
 
Regards,
 
Zhen
 

		
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