automotive air conditioning

Nowadays, the cars and trucks we buy all come with the feature of air conditioning. This system effectively controls the temperature and the humidity of the atmospheric air and circulates it in the vehicle cabin. Do you know the detailed knowledge about the automotive air conditioning and its working principles? Well, in this article, we will go through all the aspects of this air conditioning system. Basically, an automotive air conditioning system maintains the temperature as well as the humidity of the atmospheric air and spreads the cool air inside the vehicle or in your car. Its working is based on the reverse Brayton or the Rankin cycle. In the entire working of this system, processes like refrigeration, air circulation, etc. are involved. Talking about the refrigerant used here then, nowadays mostly refrigerant R134a is in use. Previously, refrigerants like Freon-12 were used in various applications.
Also Read: DIY air conditioner at home in less than $30

 The air circulating system effectively distributes the cold air through a blower or the air duct. The control system senses the temperature and allows managing the refrigerating system.

Automotive air conditioning
Following are some important components that play a crucial role in the working of the air conditioning systems in our cars and trucks:

  1. Condenser
  2. Compressor
  3. Orifice Tube
  4. Refrigerant
  5. Evaporator
  6. Thermal censor
  7. Expansion valve

This system is divided into two types according to its applications:

  • Combined function system
  • Single function system

Combined function system:
This system is used in the private cars and vehicles. Here, the processes like heating, cooling are carried out under the same boiler as well as the control system.

Single function system:
In the case of a single-function system, various processes are carried out individually. This type of system is used for public cares, trucks, luxury vans, etc.

Working of the Automotive Air Conditioning System-

Whenever you click on the AC button of your car, an electromagnetic clutch gets activated. This clutch is situated near the compressor.

Due to the activation of this electromagnetic clutch, the piston inside the compressor starts moving left and right. As a result of piston movement, the compressor starts compressing the gas. As soon as gas starts compressing, its temperature increases. Along with the temperature, its pressure also increases. Generally, the pressure of the gas is allowed to increase until it reaches 10 to 15 bar.

This hot gas is then passed through a pipe to the condenser. As the gas passes through the condenser, its temperature starts to decrease.  A radiator is also there which also help in reducing the temperature of the gas.
Also Read: DIY air conditioner at home in less than $30

One thing to note down here is that the temperature of the gas decreases but its pressure does not decrease. Inside the condenser, all the hot gas converts into the liquid. So, this liquid then passes through the receiver dryer. A receiver dryer checks whether there is any kind of gas or moisture is remaining in the pipe or not.

This liquid then passes through the expansion valve. The expansion valve has a small hole inside it, so as soon as the liquid passes through this small hole its pressure decreases. Also, it starts boiling.Then, it passes through the evaporator. After passing through the evaporator, all the cooled gas or cooled air is subjected to a rotating fan which spreads the cooled air inside the car. This entire process continues again and again.

automotive air conditioning

Watch the video on next page to understand the working of the automotive air conditioning system-

So, that is all about the working principle of the automotive air conditioning system.In this article, we saw the components and the working principle of the Automotive Air Conditioning System.



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