How does an air water heat pump work?

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The heat pump uses a special heat transfer medium (refrigerant) with a very low boiling point to transfer heat. It flows in a closed refrigerant circuit, changes its state and gradually goes through four phases:

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1. Evaporator

2nd compressor

3rd condenser (heat exchanger)

4. expansion valve

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1) In the evaporator, the refrigerant changes into a gaseous state as a result of evaporation. When evaporated, the refrigerant extracts energy from the environment and stores it within itself.

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2) In order to then transfer this energy to the water flowing in the heating system, it must condense. This is done by raising its temperature above the condensation temperature and at the same time above the temperature of the heating water to be heated.

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3) This is achieved by the compressor, where the pressure and thus the temperature of the coolant is increased. This produces saturated steam. In the condenser, the refrigerant condenses (the gas becomes liquid) and the heating water is heated.

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4) The liquid refrigerant then migrates through the expansion valve back to the evaporator, where it evaporates back to gas, and the entire process is repeated.

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A more detailed explanation of the heat pump principle can be found Here in the video from our friends from SHK-Info.