The compressor is the heart of an air conditioner. Without it, an air conditioner cannot provide cooling. Essentially, the compressor circulates the refrigerant, compresses low-pressure gas into high-pressure gas, and thereby helps remove heat from the air inside the building. what are the types of Air Conditioners Compressors.
Therefore, manufacturers equip different air conditioners with specific types of compressors based on cooling capacity, energy efficiency, noise level, and intended application. In this article, we will first explore all the types of air conditioner compressors and explain them in simple words.
What Is an AC Compressor?
An AC compressor is a type of mechanical compressor that compresses the refrigerant gas and pushes it through the condenser and evaporator coils. As a result, the air conditioner can absorb heat from inside the room and release it outside. Consequently, the performance, efficiency, and lifespan of an air conditioner depend heavily on the type of compressor used.
The performance, efficiency, and lifespan of an air conditioner depend heavily on the type of compressor used.
Main types of air condition compressors
1: Reciprocating Compressor
Reciprocating compressors operate with a piston and cylinder arrangement, similar to a car engine, with a piston moving backward and forward to compress the refrigerant gas.The compressor uses a piston and crankshaft arrangement and comes in various cylinder configurations, from a single cylinder to multiple cylinders, making it suitable for small to medium-sized cooling applications. This type of compressor is simple, easy to repair, and has a lower initial cost, but it is a bit noisy during operation and not energy-efficient compared to other compressors. Reciprocating compressors are used for window AC units, small split AC units, and refrigeration applications.
2: Rotary Compressor:
A rotary compressor is a type of compressor that uses rotating blades or rollers to compress the refrigerant. This type of compressor is smoother and quieter compared to the reciprocating compressor. The rotary compressor is compact in size, uses a continuous compression technique, and produces less vibration. This type of compressor is energy-efficient, quiet, and has fewer moving parts, which makes it less prone to wear and tear. However, this type of compressor is only suitable for small to medium-capacity air conditioners and is costlier than reciprocating compressors.
3: Scroll Compressor
A scroll compressor consists of two spiral-shaped scrolls, one fixed and the other moving. These scrolls are used to compress the refrigerant fluid smoothly. This type of compressor has the advantage of smooth compression without any mechanical losses. These compressors are highly efficient, have very low noise, and are long-lasting. However, the disadvantage of using these compressors is that they are costly to purchase and repair. These compressors are used in split air conditioners, AC systems used for commercial purposes, and VRF/VRV air conditioners.
4: Screw Compressor
A screw compressor works on the principle of two mating helical rotors that compress the refrigerant continuously. The screw compressor is suitable for large cooling capacities and is robust in nature. The screw compressor is efficient at a large load, reliable for continuous operation, and has a long life. But it is costly and requires more space for installation because of its large size. The screw compressor is used in central air conditioning plants, commercial buildings, and industrial plants.
5: Centrifugal Compressor
In a centrifugal compressor, a high-speed rotating impeller increases the pressure and velocity of the refrigerant using centrifugal force. This compressor handles high cooling capacities and often uses oil-free technology. It delivers extremely high efficiency, requires minimal maintenance, and meets large-scale cooling needs. However, it has a very high cost and demands precise installation and skilled maintenance. Engineers commonly install centrifugal compressors in large commercial buildings, chiller plants, airports, shopping centers, and hospitals.
Frequently Ask Questions
What is the difference between hermetic and semi-hermetic compressors?
The main difference between the two types of compressors, namely hermetic compressors and semi-hermetic compressors, lies in the aspect of design and maintenance. In a hermetic compressor, engineers enclose the motor and compressor in a welded casing, creating a compact design that requires low maintenance and prevents refrigerant leaks. In a semi-hermetic compressor, technicians can open the casing to perform maintenance and replace parts, allowing it to handle larger capacities for commercial and industrial applications.
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