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[EnergyPlus_Support] outside air problem

Hi,

1.For the Dxcoil and Fancoil system, users may define required fresh 
air for a zone using the outdoor air mixer. The autosized value in 
the field ¡°maximum outside air flow rate¡± could satisfy the 
ventilation requirement of occupants. My question is , as we know, 
since there exists in reality another air loop specially for the 
fresh air inducement, is this method here only a simulative method 
to handle the ventilation problem? Can I use this simplified way here
(defining the desired fresh air amount in above field ) to simulate 
a ¡° Fancoil + outdoor air¡± system, instead of using a complex  
Fancoil system along with an additional Fresh Air Handling Unit to 
meet the ventilation demand?  What is the difference between the two 
method from a fresh air supply perspective?

2  How can I identify the fields ¡°Zone cooling/heating design 
supply air humidity ratio¡±?  The default values can be regarded as  
¡°standard ¡± values or need to be revised based on each situation ? 
I thought the value , specially for the heating , seem to be over 
dry.

Is ignoring the humidity control a common practice for an office 
building energy simulation? 

Thank you very much

Eric






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