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% |