[EnergyPlus_Support] Unit ventilator latent load sizing

["andystone101" <andy.stone@xxxxxxxx>]

Hi all,

I am trying to model a space that is cooled by an EnergyPlus unit 
ventilator.  During the sizing run I want EnergyPlus to size the 
cooling coil to maintain both the space temperature and to limit the 
relative humidity within the space to 60% (at design conditions).  I 
then expect to see the zone RH varying thoughout the simulation, but 
staying mostly below 60%.

I thought maybe I could do this by adding a humidistat to control the 
cooling coil air outlet humidity (a "min hum" and "max hum" set point 
manager, a zone control:humidistat, and a controller:simple), but 
when I try to run the model I get a "Missing humidity ratio setpoint" 
error for the coling coil air outlet node.  

Is it possible to use a humidistat to influence the unit ventilator 
coil sizing calc in this way?  Is there a better way of doing this?

Thanks,

Andy



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