Chapter VI A/C System
Section I Introduction
This series of sedan has a full air conditioning system with functions of refrigeration, heating and
ventilation. The air conditioner can be used to reduce the temperature of the vehicle in summer,
heating and defrost the windscreen in winter. The air conditioning system is fully functional and
easy to operate with the compact conformation.
I. Principle of compressor refrigeration of air conditioner
The refrigeration system consists of compressor, evaporator, supercooling condenser with
drier-receiver, expansion valve, blower and control mechanism, etc., see Figure 6-1:
Figure 6-1
1. Supercooling condenser with drier-receiver 2. Pressure switch
3. Blower 4. Evaporator 5. Expansion valve 6. Compressor
See the principle of compressor refrigeration of vehicle in the illustration. Driven by the engine, the
compressor extracts the gaseous refrigerant from the evaporator and presses into the condenser.
The high pressure gaseous refrigerant makes liquefaction and heat exchange (release heat) in
condenser. Heat will be taken away by the air out of the vehicle. After the throttling action of
expansion valve, high pressure liquid refrigerant can reduce its pressure; low pressure liquid
refrigerant makes gasification and heat exchange (absorb heat) in evaporator. The cooled air near
the evaporator is blown into the vehicle by the blower. Gaseous refrigerant is extracted by the
compressor again and pumped into the condenser. Refrigerant repeats the closed circulation and
discharges heat from the inside to the outside of the vehicle and makes the temperature inside the
vehicle reduce to a comfortable temperature. See Figure 6-2:
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