Which substance acts as the refrigerant in a lithium bromide refrigeration system?

In a lithium bromide refrigeration system, water is used as the refrigerant due to its properties that make it ideal for this type of system. The lithium bromide solution absorbs water vapor in the evaporator, facilitating the cooling process. This absorption refrigeration cycle effectively utilizes the hygroscopic nature of lithium bromide, which allows it to remove moisture from the refrigerant (water vapor) and thus cool the environment efficiently.

Water has a high heat of vaporization, which means it can absorb a significant amount of heat as it evaporates, contributing to effective cooling. Additionally, the operation of a lithium bromide system typically occurs at low temperatures and involves water vapor as the refrigerant rather than a traditional gas, making water an essential component in these types of absorption systems.