Classification chiller is the production of cold water chiller refrigeration equipment, widely used in air conditioning engineering and industrial production processes. First, according to the chiller power different types of classification used: electric drive thermally driven chillers and two chillers. The addition of power-driven chiller is the use of a vapor compression refrigeration chillers principle, also known as vapor compression chillers; thermally driven chillers are mostly using the principle of absorption refrigeration chillers, also known as absorption chillers. Second, depending on the classification of the different types of compressors: 1, 2 piston chillers, screw chillers 3, 4 centrifugal chillers, scroll chillers three, according to their different ways of cooling the condenser classification: 1, 2 water-cooled chiller, air-cooled chiller 3, 4 water-cooled screw chiller, air-cooled screw chiller four, according to its evaporator cooling methods different categories: 1, 2 Closed chiller, open chiller . Five different categories according to their appearance of the structure: 1, closed chiller (chiller box or boxes) 2, 3 open chiller, screw chiller open six, according to the type of refrigerant used in different categories: separable Freon and ammonia chillers for chillers.