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How to control the flow rate in a radiant heating floor system

Hi everyone, I am doing a radiant floor heating modelling. When I model it, I assigned The ZoneHVAC:LowTemperatureradiant:VaribaleFlow. My question is if it is variable flow how I can control or set the flow rate to see the impact to room temperature? The only thing comes to me is the nodes shown on the HVAC radiant heating diagram. I am thinking they are like valves to control the flow rate?

Thanks for any help.

How to control the flow rate in a radiant heating floor system

Hi everyone, I am doing a radiant floor heating modelling. When I model it, I assigned The ZoneHVAC:LowTemperatureradiant:VaribaleFlow. My question is if it is variable flow how I can control or set the flow rate to see the impact to room temperature? The only thing comes to me is the nodes shown on the HVAC radiant heating diagram. I am thinking they are like valves to control the flow rate?

Thanks for any help.