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4. Refrigerant system
Use of refrigerant R-12 in this system cools the
air in the bus with evaporation of the refrigerant.
The evaporated refrigerant is fed into condenser
after compressed at high pressure and high tem-
perature by compressor for repeated use.
Condenser fan converts the refrigerant into liquid
at high pressure and high temperature by cooling.
Use of expansion valve cause the liquid refriger-
ant to be decompressed, to enter the cooler again,
and to evaporate to cool down the air in the bus.
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