412-03-2 Air Conditioning 412-03-2
DESCRIPTION AND OPERATION
Air Conditioning
Refrigerant Circuit with Fixed Orifice Tube
Refrigerant Circuit
Item
Description
1 Condenser
2 Compressor
3 Accumulator/dehydrator
4 Fan - heater/air conditioning
5 Evaporator
6 Fixed orifice tube
7 Electric fan
A High-pressure, liquid and warm
B Low-pressure, liquid and cool
C Low-pressure, gaseous and cool
D High-pressure, gaseous and hot
Function
The gaseous refrigerant is sucked up on the
intake side of the compressor and is then
compressed. As a result of this compression, the
refrigerant heats up to a temperature between
70°C and 110°C.
The gas is then pumped to the condenser. The
condenser consists of many cooling fins, through
which the gas is passed. The refrigerant gas is
cooled so much by the ram air and the air from
the radiator fan that it condenses.
The condensed, liquid refrigerant is then passed
through a tube of constant diameter (fixed orifice
tube). After the fixed orifice tube the pressure and
therefore the temperature drop rapidly, and some
of the refrigerant evaporates.
The fixed orifice tube is located in the refrigerant
line just before the evaporator, in which complete
evaporation of the refrigerant occurs. Because of
this the evaporator is cooled, and therefore the
air, which passes over it, is also cooled.
E1253 EN 07/2001 2002 Bantam
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