Absorption heat pumps use an ammonia-water absorption cycle, in lieu of a vapor-compression cycle, to transfer heat. Ammonia will be the refrigerant, and h2o will be the absorber. The ammonia condenses at one of many process’s coils to launch heat and evaporates at the opposite coil to absorb heat. Bryant https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/