Components Automotive Air Conditioning evaporator
Serpentine evaporator
R134a enters the evaporator coil as a cold
low-pressure liquid. As this liquid passes
through the evaporator coil, heat moves from
the warm air blowing across the evaporator
fins into cooler refrigerant. This air that has
now been cooled is then ducted into the
cabin via the blower motor.
When there is enough heat to cause a
change of state, a large amount of the heat
moves from the air to the refrigerant. This
causes the refrigerant to change from a lowpressure
cold liquid into a cold vapor. (Latent
heat of evaporation).
As the warmer air blows across the
evaporator fins, moisture contained in that air
(humidity) will condense on the cooler
evaporator fins. Condensed moisture then
runs off through the drain tubes located at the
underside of the evaporator case.
Same design as the serpentine
condenser but approximately five times
Plate & Fin Laminated Evaporators
Similar operation to the parallel flow condenser were the refrigerant has a multi flow pass
creating a large surface area.
Plate & Fin Laminated Evaporator
( Recommended for R134a)
R134a - R12 Comparison
Most manufacturers prefer to use the plate and fin design for R134a because of 20%
performance increase over the serpentine design.
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