Air conditioners are a much-needed home appliance during heavy summer. It keeps your room cool and maintain the humidity more ever they removes airborne particles, bacteria and unpleasant odor
let’s know how these excellent appliance work?
There are 5 major parts of an air conditioner
- Expansion valve
You can see the Compressor and condenser in the outer unit and evaporator and expansion valve inside the inner unit
All the parts are connected with each other by a coil/pipe. It is actually a loop where the refrigerant flows inside it.
The coil inside the room is called the evaporator coil and the coil outside the room is called the condenser coil.
The fundamental principle of an air-conditioner is to simply keeping the evaporator cold more specifically colder than the room temperature and the condenser hot more specifically hotter than the atmosphere. Let’s see how this condition is achieved practically.
When you switch on your AC, the compressor compresses the refrigerant gas. You may know when pressure increases, heat also increase. So the refrigerant get heated. Again The high pressure high temperature refrigerant then enters into the condenser where it comes to the normal atmospheric temperature and converted into liquid.
Inside the condenser there are aluminium fins and fans. The fan will blow the air into the aluminium fins and hence the air takes the heat from it.
Then the high pressure liquid refrigerant enters into a thermostatic expansion valve to get expanded.
You can even boil a liquid by just decreasing the pressure inside it.
as the pressure drops one part of the refrigerant liquid is evaporated. For this evaporation there is some energy should be supplied to it and this energy comes from within the refrigerant itself so it’s temperature drops. This is how the cold refrigerant is produced inside the expansion valve.
Then the cold refrigerant gas travels through a coil called an evaporator coil. Inside the indoor unit there is a blower which is fitted just behind the evaporator coil. When air comes from the blower it passes through the evaporator coil and hence it brings the cold air inside the room.
Again from here the refrigerant goes to the compressor to repeat the whole process.
In this way we can achieve the fundamental principles and get cold air even in hot summer.
There are two types of compressors used: one is rotary compressor and the other is a scroll compressor.
Scroll compressors are very efficient as compared to rotary. Because it is designed in such a way that it requires less power and less wear and tear occurs during compression which leads to greater longevity.
In traditional ac the compressor speed is constant. When you turn on your AC the compressor starts compressing and once it reaches the set temperature it automatically shuts down. After sometime when the temperature drops it again starts to achieve that temperature. This process repeats again and again to maintain the optimum predetermined room temperature.
In case of inverter AC the compressor never stops. It uses a variable speed motor technology to rotate the compressor, so that the refrigerant flow rate and cooling capacity can be controlled accurately.
Inverter ac vs non inverter ac, which one is better?
Inverter ac is much better than non inverter ac for the following reason.
Inverter AC cools your room faster than non inverter AC and this is because of variable speed technology. When you press the switch the motor accelerates the compressor to achieve the set temperature. There is actually a thermostatic sensor that senses the room temperature and controls the speed of the motor to maintain that desired temperature.
On the other hand, there is a fixed speed compressor used in the non-inverter ac. So it has to be on and off repeatedly to maintain the room temperature. If you know whenever an electric appliance starts it consumes 3 times more energy than its defined power. So the repeated turning on and off process of the compressor consumes a huge amount of energy. Also, it is quite uncomfortable for the huge temperature fluctuation. You can see the same in the graph below.
Again for the variable speed compressor inverter Ac’s are very silent. Most importantly there is not much of a price difference between them.