It is cool, stands for comfort, value, safety and health. But with a repair to the air conditioning it can go wrong. A new compressor, for example, quickly costs 1000 euros. Timely checking can prevent many problems.
A car air conditioner roughly consists of a compressor, an evaporator and a condenser. All according to the principle that you add heat to evaporate liquid. To allow the liquid to condense again, extract heat. The motor-driven compressor of the car air conditioning system brings the refrigerant under pressure, so that it becomes liquid in a condenser. To aircon chemical overhaul this is the best deal here.
Condensation releases heat, which, like the heat from the engine, enters the outside air. Hence an extra radiator on a car with car air conditioning. The liquid refrigerant then goes from the condenser to the evaporator, where it changes to gas, because the pressure there is lower.
The evaporator of the car air conditioner needs heat and extracts it from the outside air. The evaporated air then coolly enters the interior. The compressor then draws in the gaseous refrigerant and compresses it again in the condenser, returns it to the evaporator and starts again from the beginning.
But there is something else
The cooled air has been stripped of water because it has condensed on the evaporator. That is why there is a puddle of water under a vehicle with air conditioning on hot days. There is nothing wrong with this. Because the interior air is cool and dry, car windows have been demisted in no time.
Exclusive and more expensive cars have climate control
This works with a thermostatic expansion valve, whereby the control unit ensures that the set temperature is reached quickly and is maintained. A car air conditioner without climate control works without expansion valve and without electronic control. An air conditioning system requires around 7 hp of engine power and therefore costs extra fuel.
The functioning of a car air conditioner:
It consists of a closed system in which a refrigerant circulates under pressure. The operation is based on the physical principle that the temperature can be influenced by a change in pressure.
- Compressor moves the (low pressure) gaseous refrigerant to the condenser (high pressure).
- The heated refrigerant is pumped through the condenser. Here it relinquishes its heat to the wind or through a fan. Due to the temperature drop, the agent becomes liquid.
- The filter drier removes dirt and moisture.
The liquid refrigerant in the car air conditioner, still under high pressure, flows to the expansion valve. This reduces the pressure by allowing a small amount of refrigerant through.
In the evaporator the cold agent becomes gaseous again. Boiling starts due to the pressure reduction. This extracts heat from the outside air. The blower blows this cool air along the evaporator in the car.
The refrigerant is a fluoroethane compound. These installations can both cool and heat. They are more complicated but more environmentally friendly. Because the CO2 heater does not require engine heat, the engine is faster at operating temperature and therefore cleaner.