Coolers commonly used in apple juice industrial production include heat exchangers, condensers, cooling towers and freezers. A heat exchanger is a device that cools a liquid by exchanging heat between the liquid and a flowing coolant. Condenser is a device for cooling liquid by evaporating coolant; A cooling tower is a device for cooling liquid through the flow of coolant; A freezer is a device that cools liquid through ice water and a refrigerator.