Packaged Terminal Heat Pump

A packaged terminal heat pump (PTHP) consists of a separate, un-encased refrigeration system installed in a cabinet of similar function and configuration to that of a packaged terminal air conditioner (PTAC). It uses reverse cycle refrigeration as its prime heat source.

Required Objects

The packaged terminal heat pump (PTHP) must have the following property.

• It must be attached to a conditioned zone.

Design Assumptions

If the Draw Ventilation property is selected, the following will occur.

• The unit will provide the design outdoor air flow.
• The fan will run constantly during occupied hours.

If the Draw Ventilation property is not selected, the following will occur.

• The unit will not provide any ventilation.
• The fan will cycle on and off to meet conditioning needs.

Property	Value	Notes
System air flow	Constant
Cooling supply air temperature	12.78°C
Heating supply air temperature	40°C

Cooling Coil

The cooling coil has the following assumptions.

• It has a single-speed DX coil.
• The sensible-to-latent heat ratio is auto-sized to meet the system needs during sizing.

Property	Value	Notes
Coil leaving air temperature	12.78°C
COP	3.0

Heating Coil

The heating coil has the following assumptions.

• The coil is a DX single-speed heating coil.

Property	Value	Notes
Coil leaving air temperature	40°C
COP	5.0
Minimum operating temperature	-8.0°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	94%