Air Conditioner Evaporator and Condenser
All air conditioning systems contain at least two heat exchangers, usually called the evaporator
and the condenser. In either case, evaporator or condenser, the refrigerant flows into the heat
exchanger and transfers heat, either gaining or releasing it to the cooling medium. Commonly,
the cooling medium is air or water. In the case of the condenser, the hot, high pressure
refrigerant gas must be condensed to a subcooled liquid.
The condenser accomplishes this by cooling the gas, transferring its heat to either air or water.
The cooled gas then condenses into a liquid. In the evaporator, the subcooled refrigerant flows
into the heat exchanger, but the heat flow is reversed, with the relatively cool refrigerant
absorbing heat from the hotter air flowing on the outside of the tubes. This cools the air and
boils the refrigerant.
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