An evaporator is used in a cooling system. An evaporator absorbs heat from the surroundings, for example by cooling the surrounding air.An evaporator is used in a cooling system. An evaporator absorbs heat from the surroundings, for example by cooling the surrounding air. Heat is absorbed using a cooling medium that flows through the evaporator. The cooling medium can be one of several coolants. When the coolant flows through the evaporator and transfers heat from the surroundings, it changes phase from a liquid to a gas.
For air conditioning applications, either air-cooled or water-cooled evaporators are used.
An air-cooled evaporator is typically fitted with a copper or steel pipe, onto which aluminium fins are fitted. The cooling medium flows through the pipe, transferring heat to the fins, which in turn are cooled by a fan. A water-cooled evaporator often has an elongated tank with a built-in pipe system. The cooling medium flows around the pipes in the tank, while cold water flows inside the pipes, extracting the heat from the cooling medium.