VRF Terminal Unit

A VRF (Variable Refrigerant Flow) Terminal Unit connects to the VRF system and controls the flow of refrigerant to modulate the temperature in specific zones. These units typically include a fan coil and may offer heating or cooling functions based on the system's mode.

Sizing

Heating Capacity Sizing Ratio

Specify the Heating Capacity Sizing Ratio, indicating the ratio of the heating coil to cooling coil size when using autosizing.

Sizing Method

Specify the Sizing Method by selecting from Autosize or Manual. Manual sizing requires completion of all numerical fields with valid entries.

Supply Air Flow Rate - Cooling

Specify the Supply Air Flow Rate - Cooling as the terminal unit’s operating volumetric air flow rate in cubic meters per second during cooling mode.

Supply Air Flow Rate - No Cooling

Specify the Supply Air Flow Rate - No Cooling as the terminal unit’s operating volumetric air flow rate in cubic meters per second when the cooling coil is inactive, and the previous mode was cooling.

Supply Air Flow Rate - Heating

Specify the Supply Air Flow Rate - Heating as the terminal unit’s operating volumetric air flow rate in cubic meters per second during heating mode.

Supply Air Flow Rate - No Heating

Specify the Supply Air Flow Rate - No Heating as the terminal unit’s operating volumetric air flow rate in cubic meters per second when the heating coil is inactive, and the previous mode was heating.

Outdoor Air Flow Rate - Cooling

Specify the Outdoor Air Flow Rate - Cooling as the outdoor air volumetric air flow rate in cubic meters per second during cooling mode. This field is set to zero flow when the VRF terminal unit is connected to an AirTerminal:SingleDuct:Mixer object.

Outdoor Air Flow Rate - Heating

Specify the Outdoor Air Flow Rate - Heating as the outdoor air volumetric air flow rate in cubic meters per second during heating mode. This field is set to zero flow when the VRF terminal unit is connected to an AirTerminal:SingleDuct:Mixer object.

Outdoor Air Flow Rate - No Load

Specify the Outdoor Air Flow Rate - No Load as the outdoor air volumetric air flow rate in cubic meters per second when the terminal unit is not in cooling or heating mode. This field is set to zero flow when the VRF terminal unit is connected to an AirTerminal:SingleDuct:Mixer object.

Parasitic Electricity - Unit On

Specify the Parasitic Electricity - Unit On as the parasitic electricity consumed by the unit while operating. This consumption is accounted for as cooling or heating electricity, depending on the previous mode of operation.

Parasitic Electricity - Unit Off

Specify the Parasitic Electricity - Unit Off as the parasitic electricity consumed by the unit while not operating.

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