What Is a Compressor?
A compressor is an important mechanical device used to compress gases. The primary purpose of a compressor is to increase pressure and reduce the volume of the incoming gas. It operates by drawing in gas, increasing its pressure, and then delivering the compressed gas to another part of the system (such as a condenser).
Reciprocating (Piston) Compressors
Reciprocating compressors operate using the back-and-forth motion of a piston inside a cylinder. During this process, refrigerant gas enters the cylinder, is compressed, and then exits the compressor. The piston is driven by a crankshaft and an electric motor. These compressors are among the oldest and most common types; however, due to their high power consumption, many large companies are reducing their use and shifting toward higher-efficiency compressors such as scroll or screw types.
Applications of Reciprocating Compressors
- Oil and Gas Industry: Gas extraction, transmission, and injection into oil reservoirs.
- Petrochemical Industry: Gas compression in chemical processing and production.
- Cooling and Air Conditioning: Compression of refrigerant gas and transfer through piping systems.
- Manufacturing Industry: Industrial processes such as metal compression and finishing.
Rotary Compressor
A rotary compressor uses the rotational motion of a piston to compress refrigerant gas inside a cylinder chamber and direct it toward the discharge line. Compared to reciprocating compressors, rotary compressors consume less electricity, offer higher efficiency, produce less noise, and generate less vibration. These advantages make them a popular and suitable option for air conditioning manufacturers.
Applications of Rotary Compressors
Rotary compressors are mainly used in air conditioning systems such as residential and small commercial air conditioners and air handling units, typically up to a capacity of 5 tons of refrigeration.
Scroll Compressor
A scroll compressor consists of two spiral-shaped components: one fixed and one moving. The movement of the orbiting scroll inside the fixed scroll compresses the refrigerant gas and generates high pressure. These compressors are popular in air conditioning systems due to their quiet operation, long service life, and high efficiency. One of their main disadvantages is that they are almost non-repairable because of their sealed design.
Scroll compressors are commonly used in air conditioning systems with capacities ranging from 3 to 80 tons of refrigeration and are well suited for medium to large applications.
Applications of Scroll Compressors
Scroll compressors are primarily used in air conditioning systems and cold storage facilities. They are also applied in other industries such as dehumidifiers, laboratory equipment, laser cutting machines, household appliances, automotive systems, and hospitals. These compressors are popular due to their high efficiency and stable performance.
Screw Compressor
Screw compressors use two helical rotors (male and female) to compress refrigerant gas. As the rotors rotate within each other, they move the gas forward while continuously drawing new gas into the suction side by creating a vacuum. Unlike other compressor types, screw compressors compress gas continuously without interruption.
They are available in hermetic, semi-hermetic, and open types and are used for high-capacity applications (above 80 tons of refrigeration). Their advantages include long service life and repairability. However, due to their size, weight, and relatively high noise levels, they may be limited in certain applications.
Applications of Screw Compressors
Due to their ability to deliver continuous compressed air, screw compressors are widely used in industries such as automotive manufacturing, electronics, chemical processing, aerospace, medical and dental sectors, and transportation. They are also used in laboratories, factories, and businesses that require compressed air pressures below 13 bar. Depending on environmental conditions and industrial requirements, these compressors are available in oil-injected and oil-free versions.
Centrifugal Compressor
Centrifugal compressors are a type of dynamic compressor that use rotating impeller blades to increase the velocity and kinetic energy of gas, which is then converted into pressure. Due to their oil-free design, optimized power consumption, ability to compress large volumes of gas, and uniform pressure output, they are well suited for high-capacity and large-tonnage refrigeration systems.
Additional features include low vibration and relatively high initial cost. In projects where oil leakage could be damaging, centrifugal compressors are an excellent choice.
Applications of Centrifugal Compressors
- Air conditioning and refrigeration systems
- Pulp and paper industry
- Petrochemical industry
- Power generation
- Food and beverage industry
- Pharmaceutical industry
Diaphragm Compressor
A diaphragm compressor is a type of positive displacement compressor that uses a flexible diaphragm to compress gas. The diaphragm is driven mechanically or hydraulically, changing the chamber volume to draw in gas and then compress it.
Because there is no direct contact between the gas and moving mechanical parts, diaphragm compressors are ideal for applications requiring the compression of pure or hazardous gases, such as in medical and chemical industries. Their advantages include no need for lubrication and high resistance to corrosion.
Applications of Diaphragm Compressors
- Gas and petrochemic
- al industries
- Pharmaceutical industry
- Biological and laboratory systems
- Drilling companies
- Gas refining and oil & gas industries
- Acid and chemical production
- Petroleum-related industries
