A water source heat pump operates like a traditional air source heat pump, but it extracts and dissipates heat by way of water instead of air.
Required Objects
The water source heat pump (WSHP) must have the following properties.
- It must be attached to a conditioned zone.
- It must be connected to a condenser loop.
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 | 12.78C | |
| Heating supply air temperature | 40C |
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 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 | 3.0 |
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 | 300 Pa | |
| Total efficiency | 60% | |
| Motor efficiency | 80% |