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Underfloor Heating Heat Pumps Henco Mulyilayer Pipe Solar Panels Wood Pellet Stoves Solid Fuel Stoves Liquid Floor Screed ECO Store Technical Training Institute  |
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Geothermal Heat PumpsGround source heat pumps using the soil or groundwater as the heat source.
In the evaporator (heat exchanger) the energy transferes from the cold medium to the refrigerant. The refrigerant will then evaporate. The refrigerant is transported in the circuit by the compressor to increase the pressure and temperature of the refrigerant. In the condenser (heat exchanger) the refrigerant cools and condense. The energy is then transfered from the refrigerant to the heating system of the house, hot water system or airsystem The expansion valve regulates the mass flow of the refrigerant to maintain the pressure difference between the high pressure and the low pressure side.
Surface CollectorDuring the summer, solar heat is stored in the soil. This is either directly absorbed as insulation or as heat from rain and the air from the near-surface layer of the soil. Using this energy for heating is a cost effective method. The highest yield can be obtained from soil with high water content. The heat is extracted from the soil by means of buried plastic tubing. An environmentally-friendly, non-freezing emulsion of water- and glycol circulates in the tubing. The soil above the earth collector may not be sealed off under any circumstances, i.e. by buildings, asphalt or concrete. Earth collectors do not require a permit. Installation depth is approx. 20 cm below the local frost line.
Ground Probe Collector / Borehole / Vertical CollectorIn the lower subsoil of the so-called “near-surface geothermal layer” lies a heat source that can be utilized all year long, which has an almost constant temperature. It can be used for every possible building type, large or small, public or private. Depending on the region it is also referred to as, “vertical absorption, ground spit or ground lance”. It requires little space and the ground probe can be drilled on the smallest of plots. Therefore it is ideal for refurbishment or adaptation from a heating system fuelled by fossil fuels to the use of geothermal energy. As with a surface collector a mixture of water-glycol circulates in a closed circuit (similar to the cooling system of a car). Depending on the necessary size of the heat pump unit a specialized company ascertains the depth and amount of bore holes in which the u-shaped plastic tubing is installed and pressed, in order to achieve good heat transfer.
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