How They Work

Ground Source Heat Pumps work based on a refrigeration cycle utilising heat absorption from the ground. The sequence is described below:

1. Refrigerant liquid at low temperature and pressure absorbs heat from the source side collector array.

2. Upon exiting the evaporator, the refrigerant has now absorbed heat from the source side causing the refrigerant liquid to change state into a gas.

3. The gas enters the compressor at low temperature and pressure and is then compressed to a high pressure, thus also increasing the temperature.

4. Refrigerant gas exits the compressor at high pressure and temperature and en  ters the condenser whereby heat is transferred to the distribution system.

5. This transfer of heat causes the refrigerant gas to change state into a liquid.

6. High pressure liquid refrigerant at low temperature then exits the condenser.

7. The expansion valve reduces the pressure of the refrigerant liquid adiabatically to restart the cycle.