There are four categories of medium temperature series, namely air-cooled box type, water-cooled box type, air-cooled screw type, and water-cooled screw type. The outlet water temperature is adjustable from -5℃ to -35℃. Single cooling capacity 1KW to 1500KW for choice, refrigerating medium flow according to the working conditions and cooling capacity. The whole product is produced in the factory, after testing various indicators, filled with refrigerant, and then through water and electricity power to start commissioning, to ensure that all parameters are qualified before leaving the factory.