So how do Ground Source Heat Pumps work?
Ground Source Heat Pumps are efficient. They move energy rather than create it. For every 3kW of heat moved into your home it only uses 1kW of electricity. This is a performance efficiency of 300%!
How it actually works sounds more complicated than it is! This step by step guide will help you through it:
- The ground-loop pushes fluid around its circuit collecting the heat from the soil.
- The Heat Pump’s evaporator then uses the ground source heat obtained by the exchanger to boil the refrigerant. (This boils at approximately -10˚C). This turns the refrigerant into vapour which is then transferred to the Compressor.
- The Compressor then compresses the vapour and as its volume decreases. At the same time its temperature increases. The gas that is created is fed through to a heat exchanger within the heating pump.
- Forcing this hot gas through the central heating system’s cold water condenses the refrigerant back into a liquid. As it does this its heat is passed into the heat exchanger which supplies your domestic hot water. This powers the central heating system using the air source heat extracted at source.
- To complete the Heat Pump’s closed circuit, the pressure of the condensed liquid is reduced via the expansion valve. ‘Voila’ - your heating requirements are provided.