Absorption heat pumps use an ammonia-h2o absorption cycle, rather then a vapor-compression cycle, to transfer heat. Ammonia could be the refrigerant, and drinking water would be the absorber. The ammonia condenses at one of many program’s coils to release heat and evaporates at one other coil to soak up heat. https://total-bookmark.com/story20241131/little-known-facts-about-heat-pumps