A/C Components

GB
System layout
The main purpose of an air conditioning is
to maintain the air in the passenger compartment
at a comfortable temperature by cooling
or heating the air blown into the passenger
compartment. Further it will reduce humidity,
dust and smell in the passenger compartment.
To perform these operations, the air conditioner
for the automobile generally consist of a
heater, cooler (or evaporator), ventilation
system, such as a blower and ducts, and air
purifier.
The 5 main components of a
refrigeration cycle
Compressor (Rotated using a Magnetic
Clutch driven by the Car engine)
Condenser
Receiver / Drier
Expansion Valve
Evaporator
The system components are connected to
each other with different tubes and hoses.
Operation of a car air
conditioning system
a. The Compressor discharges high pressure
and high temperature refrigerant in a gaseous
state. The refrigerant discharged contains
the heat absorbed from the
evaporator and the heat created by the
Compressor in a discharge stroke.
After discharge the refrigerant flows to
the condenser.
b. The condenser will condense the gaseous
refrigerant into a liquid by exchanging heat
with the air passing through the condenser.
When the refrigerant is liquefied it flows to
the Receiver / Drier.
c. The Receiver / Drier will store the refrigerant
until the Evaporator requires it and it will
ensure only liquefied refrigerant flows to the
evaporator. Secondarily the refrigerant is
filtered and dried. After separation of gas
and liquid, liquid refrigerant flows to the
Expansion Valve.
d. The Expansion Valve injects the refrigerant
into the Evaporator changing the
refrigerant from a high pressure and high
temperature liquid into a low pressure and
low temperature liquid and gas mixture.
The refrigerant flows to the Evaporator.
e. The Evaporator vaporises the low pressure
and low temperature refrigerant. When
vaporising the refrigerant a high amount
of heat is required which it will absorb
from the warm air passing through the
evaporator. All liquid will change into a
gaseous refrigerant and only gaseous
refrigerant flows to the Compressor.
The process is then repeated again.
f. The system is controlled using a Computer
or Amplifier in order to maintain a
comfortable interior temperature for driver
and passengers. Sensors are used to protect
the system against too high or too low refrigerant
pressures, frosting of the
evaporator and when necessary to protect
drive belt.
Compressor Condenser Receiver / Dryer
Low pressure
side
High pressure
side
Evaporator Expansion Valve
Cool air Refrigerant flow
Warm air
DENSO EUROPE BV 23
Application A/C System tables LayoutStarters