How it works

ZEWOTHERM heat pumps are air-to-water heat pumps that extract their energy from the outside air. The principle of operation is the same as for refrigerators - but the other way round: while heat is extracted from the inside of the refrigerator and released into the environment, the heat pump absorbs the thermal energy freely available in the outside air and supplies it to the heating water or domestic hot water, depending on the requirements.

The ZEWOTHERM heat pumps consist of an outdoor and indoor unit, which are connected to each other via cooling pipes. The outdoor unit sucks in the outside air via a fan and directs it via an evaporator. The heat is extracted from the outside air. The energy obtained in this way is then transferred to the heating water in the indoor unit and used for heating purposes.



The refrigerant circuit

The refrigerant circuit is divided into four main components so that the energy extracted from the outside air can be transported to the internal unit of the heat pump.

  1. Evaporator: The heat energy contained in the outside air causes the R 410A refrigerant circulating in the heat pump (environmentally friendly), which has a very low boiling point, to evaporate.
  2. Compressor: The electrically operated compressor brings the evaporated and thus gaseous refrigerant to a high pressure. This results in a considerable increase in the temperature of the refrigerant.
  3. Condenser: The heat energy - now at a high temperature level - is transferred to the heating water. The gaseous refrigerant changes its aggregate state back to liquid.
  4. Expansion valve: In the expansion valve, the pressure of the refrigerant is reduced and thus returns to its original values in temperature and pressure.