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© 2012 Mobile Climate Control T-299 Rev. 08/2012
NOTE
The new style micro-channel condensers are
fitted with receiver-driers instead of
filter-driers. The receiver-drier performs the
same function as a filter-drier and it also
stores liquid refrigerant.
From the filter-drier/receiver-drier, the liquid
refrigerant then flows to the block type expansion
valve. The expansion valve reduces pressure and
temperature of the liquid and meters the flow of
liquid refrigerant to the evaporator to obtain
maximum use of the evaporator heat transfer
surface.
The low pressure, low temperature liquid that flows
into the evaporator tubes is colder than the air that is
circulated over the evaporator tubes by the
evaporator fans. Heat transfer isestablished from the
evaporator air (flowing over the tubes) to the
refrigerant (flowing inside the tubes). The
evaporator tubes have fins to increase heat transfer
from the air to the refrigerant; therefore the cooler
air is circulated to the interior of the vehicle.
The transfer of heat from the air to the low
temperature liquid refrigerant in the evaporator
causes the liquid to vaporize. This low temperature,
low pressure vapor refrigerant then continues
through the suction line and returns to the
compressor where the cycle repeats.
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