_______ is the refrigerant in an absorber system.

_______ is the refrigerant in an absorber system.

• A. Ammonia
• B. Freon
• C. Water
• D. Propane

Answer: (C)

In absorption cooling, the refrigerant is the substance that boils off and provides the cooling effect under low pressure. In systems that use lithium bromide as the absorbent (the common absorber chillers), water is the refrigerant. The evaporator allows water to vaporize at low pressure, providing cooling, and that water vapor is then absorbed by the LiBr solution in the absorber. The cycle is completed by regenerating the absorbed water in the generator. Ammonia would be the refrigerant in ammonium–ammonia absorber systems, not in LiBr-based ones. Freon and propane are used in other types of refrigeration (compression or different refrigerants), not in absorber systems. So water is the refrigerant in this absorber setup.

In absorption cooling, the refrigerant is the substance that boils off and provides the cooling effect under low pressure. In systems that use lithium bromide as the absorbent (the common absorber chillers), water is the refrigerant. The evaporator allows water to vaporize at low pressure, providing cooling, and that water vapor is then absorbed by the LiBr solution in the absorber. The cycle is completed by regenerating the absorbed water in the generator. Ammonia would be the refrigerant in ammonium–ammonia absorber systems, not in LiBr-based ones. Freon and propane are used in other types of refrigeration (compression or different refrigerants), not in absorber systems. So water is the refrigerant in this absorber setup.