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Why ZoneHVAC:Baseboard:RadiantConvective:Water has an air loop?

Hello all,

I want to simulate a simple single zone room with a single radiator unit with District Heating supplying the hot water to it. I want to use ZoneHVAC:Baseboard:RadiantConvective:Water. However, in the documentation I read that in addition to the hot water loop, there is an air loop with an air inlet and outlet node. I can not imagine it physically, how a radiator unit has an air loop. Has anyone simulated similar system before?

Thanks in advance.

Why ZoneHVAC:Baseboard:RadiantConvective:Water has an air loop?

Hello all,

I want to simulate a simple single zone room with a single radiator unit with District Heating supplying the hot water to it. I want to use ZoneHVAC:Baseboard:RadiantConvective:Water. However, in the documentation I read that in addition to the hot water loop, there is an air loop with an air inlet and outlet node. I can not imagine it physically, how a radiator unit has an air loop. Has anyone simulated similar system before?

Thanks in advance.