Ground source heat
How ground source heating operates
Ground source heat is thermal energy produced by the sun and stored in the earth. This thermal energy can be used to heat buildings and domestic water using ground source heat pump technology.
Heat is gathered from the ground or water by heat collection piping. This piping can be dug into the ground or sunk into a well drilled in the bedrock. A solution which features vertical drilling is known as a heat well, and is the most common method of collecting heat. It is suitable for even small plots of land and is more efficient than horizontal loops with regard to energy supply.
An anti-freeze and environmentally safe liquid solution circulates in the piping and is warmed up by the heat which has accumulated in the surrounding earth. In the ground source heat pump’s evaporator, energy is transferred from the liquid solution to a refrigerant, cooling the solution approximately three degrees.
The temperature and pressure of the refrigerant is increased to a higher level by using a compressor. In the condenser the energy is transferred from the refrigerant to the water circulating in the (underfloor or radiator) heating system and to domestic hot water heating in the energy accumulator.
The best efficiency from a pump is achieved when heat distribution is carried out using underfloor heating or some other low-warmth method. In underfloor heating, the temperature of supply water is lower (28–40 degrees) than in radiator heating, for example, where the supply water temperature is usually between 35–60 degrees. Radiator heating does not rule out ground source heating, as Gebwell’s ground source heat pumps can reliably produce water with a temperature of 60 degrees.