The ammonia circulates through a condenser and then an evaporator, where it provides the cooling, before being reabsorbed by the water.

It consists of five basic parts, the compressor, the condenser, the evaporator, the receiver, and the refrigerant flow control valve or the thermostatic expansion valve.

Absorption chiller mainly by the four exchange equipment composition, namely generator, condenser, evaporator and absorber, they formed two cycle loop: refrigerants circulation and absorber cycle.