Air Conditioning and Heating R-12 All Caterpillar Machines – Evaporator Coil



Illustration 1 g00915522

(1) Evaporator coil

In an expansion valve system, evaporator coil (1) receives liquid refrigerant from the expansion valve. In an orifice tube system, evaporator coil (1) receives liquid refrigerant from the orifice tube assembly. The liquid refrigerant that is received by evaporator coil (1) has low pressure and low temperature. Since the pressure of the liquid refrigerant is low, the temperature of saturation of the refrigerant is low. At the temperature of saturation, the refrigerant changes from a liquid into a vapor. The temperature of saturation of a fluid increases when the pressure of a fluid increases.

Evaporator coil (1) is exposed to the air that is inside of the cab. The heat from the air that is inside of the cab is absorbed by evaporator coil (1). Evaporator coil (1) transfers the heat to the refrigerant. The refrigerant is then changed from a liquid into a vapor. The vaporized refrigerant will leave evaporator coil (1). The vaporized refrigerant will carry away the heat from the cab. The vaporized refrigerant will return to the compressor when the refrigerant leaves evaporator coil (1). This process is repeated continuously.

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