|What's the Function of the Evaporator?
The evaporator provides several
functions. Its primary duty is to remove heat from the inside of your
vehicle. A secondary benefit is dehumidification. As warmer air travels
through the aluminum fins of the cooler evaporator coil, the moisture
contained in the air condenses on its surface. Dust and pollen passing
through stick to its wet surfaces and drain off to the outside. On
humid days you may have seen this as water dripping from the bottom of
The ideal temperature of the
evaporator is around 32° Fahrenheit or 0° Celsius. Refrigerant enters
the bottom of the evaporator as a low pressure liquid. The warm air
passing through the evaporator fins causes the refrigerant to boil
(refrigerants have very low boiling points). As the refrigerant begins
to boil, it can absorb large amounts of heat. This heat is then carried
off with the refrigerant to the outside of the vehicle.
Several other components work in
conjunction with the evaporator. Temperature and pressure regulating
devices must be used to control its temperature. While there are many
variations of devices used, their main functions are the same; keeping
pressure in the evaporator low and keeping the evaporator from
freezing; A frozen evaporator coil will not absorb as much heat.
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