Variable Refrigerant Flow Loop

The Variable Refrigerant Flow (VRF) loop has a VRF condenser. As an option, the condenser may be water-cooled, in which case it is attached to a condenser loop.

Required Objects

The VRF loop must have the following property.

• It must have at least one VRF Fan Coil Unit attached to the loop.

Design Assumptions

• The VRF Loop has the following default temperature assumptions.

Property	Value	Notes
Rated cooling COP	3.3
Rated heating COP	3.5
Minimum outdoor air temperature in heating	-20°C
Low temperature loop return temperature	15.5556°C	Set by hot water loop if hot water coil is used in system

Heating Coil

The heating coil has the following assumptions.

Property	Value	Notes
Coil leaving air temperature	40°C

Supplemental Heating Coil

This is an electric resistance coil with an efficiency of 1.0

Supply Fan

The supply fan has the following properties.

Property	Value	Notes
Pressure rise	250 Pa
Total efficiency	70%
Motor efficiency	90%