Absorption heat pumps use an ammonia-water absorption cycle, instead of a vapor-compression cycle, to transfer heat. Ammonia could be the refrigerant, and h2o would be the absorber. The ammonia condenses at one of the method’s coils to release heat and evaporates at another coil to absorb heat. Absorption heat pumps https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/