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[EnergyPlus_Support] Problems in maintaining humidity control

Hello all,


I am wondering if anyone has any experience in modelling VAV systems that maintain strict control over temperature AND humidity in a zone.


I am modelling an AHU that provides air to two interior zones in an art gallery. I cannot seem to force the system to maintain control over the zones over a 24hr period as required by the Art Gallery. 


One of my major problems that I have found is a floating setpoint on my VAV system outlet node. During the winter, the setpoint output on the csv emulates the idf input, however during the summer design day, the csv output for the setpoint value floats from ?57oC to 3oC. I cannot seem to locate the source of this error as I have no errors or warning. It is scheduled to a set value of 17.5oC during the summer and 16oC during the winter. I also have trouble stipulating the flow using the sizing objects, they seem to be ignored but I am guess this is due to an error elsewhere in the idf.


I have uploaded the file to the yahoo page? AHU3_AirLoop_PurchasedPlant_V1.idf


I would appreciate anyone?s experience or advice with this matter.


Kind regards


-Elmer Morrissey

PhD Researcher, IRUSE, NUIC, Ireland.

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