What is a chiller and how does it work?

 An evaporator is placed between the expansion valves, and the condenser removes heat from any associated processes into the circulating refrigerant.

A chiller is a machine that extracts heat from a liquid refrigerant. It does this by circulating the heat-absorbing refrigerant through a series of heat-release mechanisms. The liquid can then be circulated through a heat exchanger to cooled equipment, or to another process stream.