Heat exchanger also called heat transfer machine, is the equipment that can transfer certain heat from the thermal fluid to the cold fluid. It is the essential equipment to achieve the heat exchange and transfer during the production process. It’s the evaporator that the cold water flows in the tube and the refrigerant evaporates in the shell. It’s one of the main styles of refrigerating unit that cool the secondary refrigerant. It commonly adopt horizontal type, which has the characteristic of effective heat transfer, compact structure, small occupied area and easy installation etc.