Main Components of Auto Air Conditioning Explained

The compressor, condenser, recover-drier, orifice tube or expansion valve, evaporator, hoses, and, of course, refrigerant, all function in the same simple way, depending on the concepts of evaporation, condensation, compression, and expansion, and consist of the same seven main components: the compressor, condenser, recover-drier, orifice tube or expansion valve, evaporator, hoses, and, of course, refrig

The refrigerant, now known as HFC-134a (R-134a), boils at about -15.9 degrees Fahrenheit, making it a gas at normal atmospheric pressure. The Latent Heat of Evaporation is one of the fundamental concepts that an A/C device works on. This ensures that the refrigerant must be able to evaporate, so it must first become a liquid. If you’re not familiar with the Latent Heat Principle, it works in the same way as sweat does on a hot day to keep your body temperature in check. this page

When you sweat, the moisture on your skin evaporates, trapping heat and giving you a cooling feeling. R-134a must be extremely pressurised to increase the boiling point high enough for the refrigerant to condense to a liquid at more realistic ambient temperatures.

The A/C system is a continuous loop that is split into two parts by the compressor: a high-pressure side and a low-pressure side. The now heated and pressurised gaseous refrigerant is pushed through a hose into the condenser by the high pressure produced by the compressor’s pumping, where much of the heat allows the refrigerant to condense into a liquid state. The still-highly-pressurized liquid then passes through a filter and desiccant material in the recover-drier, which removes any debris from the device as well as moisture and impurities from the refrigerant. (When moisture and refrigerant mix, a corrosive acid is formed.)

The purified liquid refrigerant is pushed through a narrow orifice, either in the form of a fixed orifice tube or a thermal expansion valve, after flowing through the A/C hoses and into the car’s cabin. The fine mist generated by the valve (imagine a finger over the end of a hose) is directed into the evaporator in the heater box under the dash. The expansion valve’s drop in pressure is enough to cause the refrigerant to vaporise as it passes into the evaporator, absorbing a significant amount of heat in the process.