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It sounds like you are trying to use EnergyPlus. You will have to create your wall construction and specify the parameters for a Construction:InternalSource. Assign the construction you just created to the wall surfaces as required, and then add a ZoneHVAC:LowTemperatureRadiant:VariableFlow or ZoneHVAC:LowTemperatureRadiant:ConstantFlow to the zone where your building is. You can look at an example set-up in the EnergyPlus example files.