Average | Range | Typical Value* | |
Number of Boreholes for Vertical GHP | 207** | 18 - 928** | Varies |
Borehole Depth [m] | Vertical: 63 Horizontally bored: 10 | Vertical: 46 - 91 Horizontally bored: 7.6 - 12.2 | Vertical: 15 - 137 Horizontally bored: 9.1 - 15.2 |
Borehole Separation Distance [m] | 4.9 | 2.4 - 6.1 | 4.6 - 6.1 |
Borehole Length per kW [m/kW] | 18.0 | 7.2 - 31.3 | 13.0 - 21.7 |
GHP water flow rate per kW [L/min/kW] | 3.7 | 2.3 - 5.8 | 2.7 - 3.2 |
Heat Pump Efficiency Range | Cooling: 4.16 - 5.07 COP Heating: 3.1 - 3.9 COP | Cooling: 2.46 - 8.79 COP Heating: 2.5 - 6.4 COP | Mini. Cooling: 3.93 COP*** Mini. Heating: 3.1 COP*** |