Air Conditioning in Vehicles

The Air conditioning system is a vital aspect of today's automobile.  It is difficult to imagine a car without it.  The Air Conditioning unit, as the name suggests, "conditions" air.  Air is conditioned in terms of temperature and humidity.  The temperature of the air is reduced and its humidity is removed.

The Air conditioning cycle or the refrigeration cycle works by compressing a gas, cooling it, allowing it to expand and absorb heat from the air to be cooled and the compressing it to a liquid again.  The refrigerant is the gas which is used as the working fluid.  In earlier times, ammonia was used as the refrigera 

The air conditioner consists of the following components.

Compressor:  The compressor is the central part of the air conditioning system. The compressor compresses the refrigerant (the gas used for refrigeration).  It is driven by the engine of the automobile through a belt. 

Condenser: The compressed air from the condenser is cooled by the condenser by means of a cooling fan. 

Evaporator: The Evaporator is place where the liquid refrigerant transforms into a gas.  As this happens, heat is absorbed from the surrounding regions.  There is a expansion valve which regulates the evaporation of the liquid and consequently the temperature.  Outside, air is passed through the tubes.  The air loses heat and becomes cool and is blown into the car as cool air. 

Accumulator.  The accumulator is used as reservoir for the liquid has not still evaporated.  This can cause damage to the compressor.  The Accumulator serves to hold the liquid refrigerant.