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Illustration
Parts and their function
Refrigerant
Liquid flow
Description of the cooling system
This drawing illustrates the different parts
of the cooling circuit and where
they are situated in the AC 24 unit:
This table gives an overview and short description of each part shown above and on
the next page:
Compressor
Circulates the fluid in the cooling system
Condenser
Emits the heat generated in the tent/room to the outside air
Receiver
Accumulates surplus coolant in connection with the cooling process
Dry filter
Absorbs moisture and impurities in the cooling circuit
Sight glass
Enables a visual check of the coolant
Expansion valve Supplies the correct quantity of coolant into the evaporator. It also
reduces the pressure
Evaporator
Absorbs heat from the shelter by cooling down the circulated air
HP pressure
Ensures that the compressor does not operate at too high pressure
switch
LP Pressure
Ensures that the compressor does not operate at too low pressure
switch
The cooling circuit is hermetically sealed and filled with refrigerant (R134a).
From the receiver liquid refrigerant will flow under high pressure through the liquid line
dryer and the sight glass to the thermostatic expansion valve which releases the pressure. Here
the refrigerant is led into the evaporator where it evaporates under low pressure and low
temperatures.
The evaporated refrigerant is drawn back to the hermetic compressor and compressed. From
the compressor the refrigerant vapour goes to the condenser, where it is cooled to below the
dew point and condensed to liquid refrigerant.
13
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