Autotronics Services

Air-Conditioning Cycle:
The refrigerant flows into the condenser. The condenser has numerous cooling fins in which the v***r is pumped. In the condenser the high pressure v***r condenses into a high pressure liquid.

This is achieved by reducing the temperature from, for example, 80°C to below 57°C which is the refrigerant’s boiling point.
This is achieved by forcing air over the surface of the condenser enabling heat to transfer from the refrigerant to the outside air thus reducing its temperature (sub cooled). Only refrigerant in the form of a high pressure sub cooled liquid leaves the bottom of the condenser outlet.

The sub cooled liquid refrigerant flows into the receiver drier which stores, dries and filters the liquid refrigerant. The sub cooled liquid refrigerant then flows from the receiver drier to the expansion valve which then changes the refrigerant into low pressure, low temperature liquid/v***r.

This is achieved by lowering the pressure using a variable or***ce. The or***ce has high pressure one side (from the receiver drier) and low pressure the other (ev***rator and compressor) and allows a small quantity of refrigerant to flow through it.
The sudden drop in pressure and temperature causes some of the refrigerant to v***rize which is called a flash gas. The low pressure low temperature liquid/v***r then flows to the ev***rator where the heat is transferred from its surface to the refrigerant through v***rization.

The heat comes from either inside (recycled air) or outside (fresh intake of air) the vehicle and is blown over the ev***rator’s surface. Once the refrigerant has completely v***rized and reached its saturation point it should still be able to carry more heat.
The refrigerant continues to flow through the remainder of the ev***rator coils absorbing more heat and becoming slightly superheated. The low pressure low temperature slightly superheated v***r refrigerant flows to the compressor and the cycle repeats itself.