Specifications

Section 3

3-24

TOYOTA Technical Training

Based on the physics of heat transfer, an automotive A/C system works

n these principles:

•

Heat is absorbed from the passenger compartment by the e

vaporator.

This happens because the expansion valve restricts the flow of liquid

refrigerant and increases pressure. However, when the expansion valve

opens, there is a drop in pressure which causes the refrigerant to

evaporate and absorb heat. Dehumidification occurs as the interior air

is drawn across the cool surface of the evaporator.

•

The gas coming out of the evaporator has its pressure and temperature

raised by the compr

essor.

• The hot gas releases heat to the outside air at the condenser and

changes (condenses) back into a liquid before being filtered and stored

at the

receiver-drier.

Review of

Refrigeration

Circuit

A/C Refrigerant

Cycle

Fig. 3-27

752f327

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