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

asked 2016-03-09 20:44:18 -0500

Hyphen32 gravatar image

updated 2016-03-10 08:39:29 -0500

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.

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answered 2016-03-10 18:15:46 -0500

If you put output variable systemnodemassflowrate and systemnodetemperature (check these variable names but this is the jist) then run the simulation and open the eso file. Here you can see the flow rate through those nodes and see if it is what you expect. You will also see the temperatures at these nodes and in the space. This way you can check what your system is doing. Then in the object itself you can set the design flow rate if you need to control it further. My experience with the object is that it helps to put all the values in that it is asks and leave nothing on autosize, the ceilings control very well in this case.

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answered 2016-03-10 01:36:02 -0500

Chandan Sharma gravatar image

ZoneHVAC:LowTemperatureradiant:VaribaleFlow throttles hot or chilled water flow based on the radiant system controls defined in this object's input fields. Input Output reference describes the controls in detail. Also, there are many E+ example files which illustrate modeling of this object.

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Asked: 2016-03-09 20:44:18 -0500

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Last updated: Mar 10 '16