Water-cooled unit is mainly composed of evaporator, compressor, condenser,  expansion valve and other components. Its main working principle is to use  the refrigerant in evaporator to absorb heat from outside of the machine  and continuously evaporate to achieve cooling effect.Water-cooled unit's main  difference is that the condenser, it has shell and tube type, sleeve type  drains water. all type is cooling done through water.Water-cooled unit has  the advantages of strong cooling capacity and low energy consumption