News from the world of OCHSNER heat pumps
Heat pumps WORK VERY EFFICIENTLY
because they draw around three quarters of their energy from the environment and only about one quarter – drive energy – is supplied by electricity.
Heat pumps primarily use energy sources with almost unlimited availability: heat from ambient air, groundwater or the ground. In addition, there are further heat sources such as waste heat from other processes, from sewage and many more besides. For detached and two-family houses, air, ground and groundwater are of primary interest. Extract air from the building is also suitable for DHW heat pumps . There are other heat sources which can be tapped, above all in industry, commerce and the residential housing sector. Which heat source is suitable in any specific case depends on the energy standard of the building, its geographical location and the site. In case of doubt, consult an expert, such as an OCHSNER system partner. More information can be found in the sections on Groundwater heat pumps, Ground source heat pumps and Air source heat pumps.
Heat pumps FUNCTION LIKE REFRIGERATORS
just in reverse. The basic principle governing heat pumps is always the same.
They generally operate just like a refrigerator. One end of the heat pump process generates cooling, the other end generates heat. This is very obvious in the case of a refrigerator. As the interior is cooled, heat is generated behind the refrigerator which is transferred to the ambient air. In a thermodynamic process, heat pumps make use of the fact that the temperature of certain refrigerants changes when they are put under pressure or allowed to expand. If pressure increases, the temperature rises as well. If the pressure decreases, it drops. Within the heat pump circuit, the refrigerant draws heat from the ground, groundwater or air until it has warmed to approximately the same temperature as these media. The liquid is then compressed in a compressor, which raises its temperature. At the other end of the process, this higher temperature is transferred to the heating system water or domestic hot water via heat exchangers. This causes the temperature of the compressed refrigerant to drop. The liquid is then relaxed, whereby the temperature falls further an dramatically – to a temperature significantly lower than the initial temperature. The decompressed, cooled liquid is then returned to the heat source – ground, groundwater or air – where it is heated, and the heat pump cycle of compression, heat transfer, decompression and cooling can start all over again.