Comparison of different types of compressor

Comparison between different types of compressor

compressors-comparison

Comparison between Reciprocating Air Compressor and Rotary Air Compressor:

Aspects
Rec. Air Compressor
Rot. Air Compressor
1.Suitablity
Suitable for low discharge of air at high Pressure.
Suitable for handling large volume of air at low pressure.
2.Operational Speed
Low
Usually High
3. Air Supply
Pulsating
Continuous
4. Balancing
Cyclic Vibration occur
Less Vibration
5. Lubricating System
Generally complicated
Generally Simple lubricating s/m.
6.Quality of air delivered
Generally contaminated with air
Air delivered is relatively more clean
7. Size
Large for the given discharge
Small for the same discharge
8. Free air handled
250-300 m3/min
2000-3000m3/min
9. Delivery pressure
High
Low
10. Usual standard of Compression
Isothermal compression
Isentropic Compression

Comparison of Centrifugal Compressor and Axial flow compressor:

Aspects
Centrifugal Compressor
Axial Flow Compressor
1.Type of flow
Axial (Parallel to the direction of axis of the machine)
Radial
2.Pressure ratio per stage
High (about 4.5:1)
Low (about 1.2:1)
3. Isothermal efficiency
About 80-82%
About 86-88%
4.Frontal area
Larger
Smaller
5.Flexibility of operation
More
Less
6. Part load performance  
Better
Poor
7. Effect of deposit formation on the surface of impellor rotor
Performance not adversely affected
Performance adversely affected
8. Starting torque required
Low
High
9. Suitability for multistaging
Slightly difficult
More suitable for multistaging
10. Delivery pressure possible
Up to 400 bar
Up to 20 bar
11. Efficiency V/S speed curve
More flat
Less flat comparatively
12. Applications
Used in: blowing engine in steel mills, Low pressure refrigeration, big central air-conditioning plants, fertilizer industry, Superheating IC Engine, Gas pumping in long distance pipe line etc [Previously used in jet engines]
Mostly used in jet engines, Power plant, gas turbines and steel mills.

Comparison of Reciprocating Compressor and Centrifugal compressor:

Aspects
Reciprocating Compressor
Centrifugal Compressor
1.vibration problems
Greater
Less
2.Mechanical efficiency
Lower
Higher
3. Installation Cost
Higher
Lower
4. Pressure ratio per stage
About 5:8
About 3:4.5
5. Capability to deliver pressure
High pressure
Medium pressure
6. Capability of delivering volume of air/gas
Small
Greater
7. Flexibility in capacity and pressure range
Greater
No flexibility in capacity and pressure range
8. Maintenance expenses
Higher
Lower
9. Continuity of service
Lesser
Greater
10. Compression efficiency
Higher at compression ratio above 2
Higher at compression ratio less than 2
11. Adaptability
Adaptability to low speed drive
Adaptability to high-speed low maintenance cost drivers such as turbines.
12. Operating attention
More
Less
13. Mixing of working fluid with lubricating oil
Always a chance
No chance
14. Suitability
For low, medium and high pressure & Low and medium gas volumes.
For low and medium pressures & Large gas volumes.


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