How to control Zone air temp in radiant cooling panels in E+?

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Hello Guys,

I actually modeled a hydronic radiant cooling system in Energy plus using ZoneHVAC: LowTempRadiant: VariableFlow for a zone and I got the results as well. The controllers used for this object are on water side mostly. However, Now I want to model the radiant hydronic cooling system using the zone air temperature set point. In other words, I want to model the radiant panel and find the panel's heat transfer, water mass flow rate, etc. based on fixed constant zone air temperature, so that I get the constant temperature (cooling set point= 24 C) as zone air temperature. Does any one know how to do this in Energy plus? I actually tried to define (ZoneControl:Thermostat) but did not work, since it is mostly used for forced air systems (not the radiant panels)

I'll appreciate if any one can help me with this.

Thanks, Mjc