Output is twice of Input [W] for LowTemperatureRadiant:VariableFlow -

asked 2021-02-25 15:14:26 -0500

fengcool gravatar image

updated 2021-04-02 12:38:26 -0500

Hi,

I set the radiant floor heating design capacity at specific value, say 1,000 W, but when I check the "Zone Radiant HVAC Heating Rate" the output is 2,000 W. I tried other values, 500, 300 and the output is always twice of the input.

=== IDF === ZoneHVAC:LowTemperatureRadiant:VariableFlow, Zone HVAC Low Temperature Radiant Variable Flow 1, !- Name Always On Discrete, !- Availability Schedule Name Thermal Zone 1, !- Zone Name Zone HVAC Low Temperature Radiant Variable Flow 1Floors, !- Surface Name or Radiant Surface Group Name ConvectionOnly, !- Fluid to Radiant Surface Heat Transfer Model 0.012, !- Hydronic Tubing Inside Diameter {m} 0.016, !- Hydronic Tubing Outside Diameter {m} Autosize, !- Hydronic Tubing Length {m} 0.35, !- Hydronic Tubing Conductivity {W/m-K} MeanRadiantTemperature, !- Temperature Control Type ZeroFlowPower, !- Setpoint Control Type HeatingDesignCapacity, !- Heating Design Capacity Method 1000, !- Heating Design Capacity {W} , !- Heating Design Capacity Per Floor Area {W/m2} , !- Fraction of Autosized Heating Design Capacity

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