Air conditioners are one of the fast moving home appliances currently in the Indian market.
Being a developing country with a burgeoning middle class with increasing disposable income, these devices are no more considered as a luxury but a necessity.
With the temperature clocking constantly above 40 degrees in the summer and touching new lows every winter, the need to have an air conditioner at your home/office has become a must.
In this article, we’ll discuss in detail one of the single most important component of an air conditioning system – the compressor.
The presence of a good compressor can be a make or break situation in an air conditioner purchase, so we feel its apt to go a bit technical in this post to let you understand the importance of the same.
Air Conditioner
An air conditioner is an appliance used to modify the indoor air conditions such as humidity, temperature, moisture level etc.
The primary aim of a home/office air conditioner is to increase the comfort level for human beings inside a closed space.
There are different types of air conditioners available in the market catering to different use cases.
The regular split and window ACs are suitable for the small to medium sized living spaces and office rooms.
Cassette type ACs are suitable for air conditioning spaces with more occupants inside.
For cooling a large volume of space, centralized AC systems are employed.
Working of an Air Conditioner
Before getting into the specifics of an AC compressor unit, let’s discuss how does an AC work.
The main three components of an air conditioning system are compressor, condenser and evaporator.
The compressor and condenser are the outdoor units and the evaporator is what you see inside your home/office.
- The compressor compresses the refrigerant (in gas from) to a smaller volume resulting in the increase in its temperature.
- This gas is then fed into the condenser which helps in releasing the heat to the outside.
- From the condenser, the gas flows via an expansion valve, at the end of which the gas turns into a liquid state.
- The liquid refrigerant finally enters the evaporator and absorbs heat from the interior to make the surroundings cooler.
Compressor
A compressor is a mechanical device which increases the pressure of a gas by bringing about a reduction in its volume.
In refrigeration and air conditioning, the quality and type of compressors used significantly determine the performance and efficiency of the system.
When it comes to the air conditioners which we are familiar to in our homes and offices, the two main types of AC compressors used are reciprocatory and rotary compressors.
Reciprocating Compressors
Reciprocating compressors, as you might have already guessed from the name itself, works similar to the one in an automobile engine.
It consists of the regular piston and cylinder setup with the piston moving back and forth to compress the fluid inside.
There can be multiple cylinders inside a reciprocating compressor and all of them can work in tandem to ensure excellent efficiency.
Rotary Compressors
Rotary compressors consist of a pair of specially designed rotors rotating in the opposite directions.
These rotors have a very little clearance between them and the fluid attains high pressure inside.
The most recent iteration of the rotary compressor is the scroll type system.
This compressor consists of a static central coil and a rotating coil on top.
The rotating coil pushes to the fluid into the centre of the fixed coil, thereby increasing its pressure.
Comparison Between the Reciprocating and Rotary Compressors
There are distinct advantages and disadvantages for both of these compressors.
Choosing one from the other is a really difficult task and solely depends on your usage scenario.
Advantages of a Reciprocating compressors
- Increased efficiency
Since multiple piston and cylinder arrangements can be set up inside the compressor, extremely higher pressure can be attained.
- Easy maintenance
Since piston and shaft mechanism is common and easily disassembled, there is no issue in fixing problems, if any pops up.
Disadvantages of Reciprocating Compressors
- Vibration and Noise issues
Since the compressor consists of multiple moving mechanical elements inside, the level of noise and vibration is high compared to other compressors.
Advantages of Rotary Compressors
- Less noise and vibration
The rotating sections inside the rotary compressor feature minimal moving parts, resulting in considerably lesser noise and vibration while operating.
- Best for large scale air-conditioning applications
Rotary compressors can operate under a much wider power range and pressures than reciprocating compressors, making it ideal for businesses and industrial applications.
Disadvantages of Rotary Compressors
- Have to be used continuously for durability and better performance.
Since home Ac usage is periodic and not regular, these compressors are better suited for offices and factories with a fixed time schedule.
- Comparatively expensive than reciprocatory compressors.
Which is the best: Rotary Compressor or Reciprocating Compressor?
If you are looking for an Air Conditioner for your home or office with small space, the reciprocating compressor is the best choice for you. For cooling a large space with regular continuous working for long hours, look for an AC with a rotary compressor.
Inverter Compressors
Inverter technology is a fairly recent advancement in the Indian home appliance market.
Inverter compressors are not an entirely new type of compressor but a technology on top of the existing compressors to make them more power efficient and capable.
DC inverter is used to control the speed of the compressor so that the AC can precisely adjust the temperature.
Also, inverter ACs have a variable-frequency drive, which never shuts off the compressor totally.
This results in less wear and tear to the parts, no sharp fluctuations in current, and overall quieter and silent operation.
Inverter compressor ACs may be a bit expensive than traditional ACs but it’s worth every single additional penny.
Final Thoughts
This concludes our short explainer article about various types of compressors used in air conditioner systems available in the market.
There are merits and demerits for each one of them, but now with a better understanding of these components, you can make an informed choice depending on your use cases.
If you have any doubts regarding the same, please let us know in the comment section below and we’ll be happy to answer your queries.
Thanks for your time on our website and have a great day ahead!
doea rhe inverter AC is successful in an area around 285sq ft. due its variable flow nature?
Hi Tarun,
Yes. Inverter ACs can cool living spaces much more easier and efficient that normal compressor powered ACs. By variable flow nature, we assume that you mean the inverter compressor varying its performance on the go. The inverter AC cools up the living space to the desired temperature, no matter the size ( depends on the tonnage ) and after that goes in to sort of a hibernation mode for energy efficient operation. Even in this mode, the AC continues it’s cooling process and doesn’t turn off completely as opposed to the normal non-inverter ACs.
Are reciprocating compressors serviceable/repairable? I have 4.5T , 10 years old one that I need to get repaired? in Hyderabad
Hi Srinivas,
Compressor mechanics can be found in most of the cities in India. Look for AC or refrigeration workshops in your area and the guys over there will service your faulty compressor.
If you have better set up you can have repair other wise better to send to factory.
Rotary compress is better or dual rotor technology is better compare to two
What is dual rotor technology
Hi Naresh, thanks for your interest in the article.
As for your doubt, dual rotor technology employs the same rotary compressor itself not one but two. When the AC is powered by a single rotary compressor, there is high chance that precise cooling adjustments might not be possible. Not only this, single rotary compressors can also vibrate heavily and cause more noise. When it comes to the dual rotor technology, there are two rotary compressors running side by side at different frequencies, ensuring a much precise cooling control and low noise.
Sir,
what is difference between inverter Piston Compressor and Rotary inverter Compressor in ACs
Hi Samar, thanks for your interest in the article. Now coming to your question, by piston compressor we guess you are talking about the reciprocating compressor. Pistons are a component in reciprocating compressors. If you have read the article already, we have detailed the same for more clarity.