Ground Source Heat Pumps take advantage of the relatively stable temperatures of an area of ground or body of water near to your property. The ground is warmed by several sources including the sun, along with natural geothermal gradients and ground water movement amongst other influences. GSHPs can therefore be deployed even in the very coldest areas of the UK.
This stored energy can be extracted from the ground and used by a heat pump to provide heating and hot water energy for your home. Heat pumps and some ground array designs can provide comfort cooling for homes as well, all from the same heat pump system.
We place a series of pipes in a borehole, trench or surface water feature near your home, in a precise pattern. This is called the ground loop. The pipes contain heat transfer fluid, in a closed loop, which flows repeatedly through a heat pump, compressor and expansion valve to provide uniform heat all year round.
The technical explanation
The fluid in the ground loop goes into an evaporator heat exchanger within the heat pump
The evaporator's cold refrigerant extracts heat that the ground loop has collected from the water or ground and is then passed through a compressor causing it to become very hot
The hot refrigerant passes through a condenser heat exchanger, which transfers the heat to the water in a closed domestic heating or hot water system
Once the refrigerant leaves the condenser, it is cooled and passes through an expansion valve, similar to an aerosol nozzle, which makes the refrigerant very cold again before it goes back in to the evaporator