In the aqua-ammonia absorption refrigeration system, the weak solution is taken in and the strong solution is given out.

In the ammonia−water absorption refrigeration cycle, the refrigerant is ammonia and the absorbent is water.

• In the absorber, the weak solution of ammonia-water is already present. The water, used as the absorbent in the solution, is unsaturated and has the capacity to absorb more ammonia gas.
• As the ammonia from the evaporator enters the absorber, it is readily absorbed by water and a strong solution of ammonia-water is formed.
• During the process of absorption, heat is liberated which can reduce the ammonia adsorption capacity of water; hence the absorber is cooled by the cooling water.
• Due to the absorption of ammonia, a strong solution of ammonia water is formed in the absorber.
• Hence in the aqua-ammonia absorption refrigeration system, weak solution is taken in and strong solution is given out.