Heating Coil

A heating coil is a component used for space heating in HVAC systems. For electric heating, the heating coil is typically an electric resistance coil that converts electrical energy into heat. In the case of water heating, the heating coil is a heat exchanger through which hot water flows to transfer thermal energy to the air stream.

Heating Coil (Electric Heating)

Sizing Method

Specify the sizing method as Autosize or Manual. If Manual is chosen, ensure all sizing parameters are specified.

Coil Efficiency

Specify the coil efficiency as a user-defined efficiency in decimal units (not percent), with a typical value of 100% for electric coils.

Capacity

Specify the maximum capacity of the coil in watts. This controlled coil will provide only the needed capacity to meet the control criteria, whether it is temperature or capacity controlled.

Heating Coil (Water Heating)

Sizing Method

Specify the sizing method as Autosize or Manual. If Manual is chosen, ensure all sizing parameters are specified.

Max. Water Flow Rate

Specify the maximum water flow rate in m³/s through the coil when the Coil Performance Input Method is set to U Factor Times Area And Design Water Flow Rate.

Capacity

Specify the maximum capacity of the coil in watts. This controlled coil will provide only the needed capacity to meet the control criteria, whether it is temperature or capacity controlled.

Inlet Air Temp

Specify the inlet air temperature in degrees Celsius corresponding to the rated heating capacity. The default value is 16.6 degrees Celsius.

Inlet Water Temp

Specify the inlet water temperature in degrees Celsius corresponding to the rated heating capacity. The default value is 82.2 degrees Celsius.

Output Air Temp.

Specify the output air temperature in degrees Celsius corresponding to the nominal heating capacity. The default value is 32.2 degrees Celsius.

Output Water Temp.

Specify the outlet water temperature in degrees Celsius corresponding to the rated heating capacity. The default value is 71.1 degrees Celsius.

Ratio for Air and Water Convection

Specify the ratio of convective heat transfers between the air side and water side of the heating coil at the rated operating conditions. The default value is 0.5.

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