TM 5-3805-290-23-1
THEORY OF OPERATION - CONTINUED
0003 00
AIR CONDITIONING SYSTEM - CONTINUED
4.
As the high temperature and high pressure refrigerant vapor passes through the condenser, the condenser absorbs heat
from the refrigerant vapor. The condenser transfers the heat to the outside air. The temperature of the refrigerant and the
pressure of the refrigerant decrease until the temperature of saturation is reached. When the temperature of the refriger-
ant vapor is equal to the temperature of saturation, the refrigerant becomes a high temperature and high pressure liquid.
When the refrigerant is converted into a liquid, the refrigerant leaves the condenser.
Evaporator Coil
1.
The evaporator receives liquid refrigerant from the orifice tube assembly. The liquid refrigerant that is received by the
evaporator 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.
2.
The evaporator coil is exposed to the air inside of the
cab. The heat from the air inside of the cab is absorbed
by the evaporator. The evaporator transfers the heat to
the refrigerant. The amount of heat required to reach
the temperature of saturation is called the latent heat
of vaporization. When this heat is absorbed by the
refrigerant, the temperature of the refrigerant will
reach the temperature of saturation. The refrigerant
will change from a liquid into a vapor. The vaporized
refrigerant will leave the evaporator. The vaporized
refrigerant will carry away heat from the cab. The
vaporized refrigerant will return to the compressor
when the refrigerant leaves the evaporator. This pro-
427-B2087
cess is repeated continuously.
END OF WORK PACKAGE
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