How does a heat pump work?

How does a heat pump work?
Heat pumps transport heat from a place with a low temperature to a place with a higher temperature and vice versa. This usually takes place in a closed system in which a heat transfer medium flows. Pumping heat from cold to hot requires energy in the form of electricity – and the greater the difference between the temperature levels, the more energy is needed. A well-known example is the refrigerator, where a heat pump transports the heat from the interior to the exterior.
Credit:

White Paper "Strengthening Industrial Heat Pump Innovation – Decarbonizing Industrial Heat"

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