In an absorption system, what medium is typically used to vaporize refrigerant?

In an absorption system, steam is typically used as the medium to vaporize refrigerant. This process leverages the heat content of steam to facilitate the phase change of the refrigerant from a liquid to a vapor state. The absorption refrigeration cycle relies on a combination of an absorbent and a refrigerant. The heat provided by steam assists in driving the absorption cycle forward by helping release the refrigerant from the absorbent, enabling it to circulate and create the cooling effect.

Choosing steam is particularly advantageous due to its efficiency and effectiveness in transferring heat. It can provide a consistent and high-quality source of thermal energy, making the absorption refrigeration system work optimally. The use of water or other substances like propane and ethylene would typically not serve the same purpose, as they do not provide the necessary heat transfer characteristics or compatibility required for efficient vaporization in this context.