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[EnergyPlus_Support] Humidity control in an Autosized AHU

Hello all,

I am having major difficulty maintaining 50% RH in a single zone 
supplied by a simple AHU.

Fresh air- -> Fan -> CC -> HC -> Hum -> -----------TRH -> Zone->-----
------exhaust

The max humidity ratio is assigned after the cooling coil while the 
minimum humidity ratio is set after the humidifier. I am looking at 
a typical design day in a British climate and it should not be 
overtaxing.

Unfortunately, the RH is not maintained during the summer months 
(even though I oversized the system sizing object). The average RH 
is around 57%. During the winter, RH values slip around mid-day for 
a four hour period that I cannot explain.

I've taken a look at the setpoint output from the CSV file for the 
max and min humidity ratios and it seems to me like they just are 
not be applied within the model. I am aware that humidity control is 
not the strongest area in E+ but is there any way of creating a file 
that would work for an autosized run?

Can anyone help or point out some things I may have overlooked?

Kind regards

-Elmer






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