Compare reciprocating and rotary air compressor

Compare reciprocating and rotary air compressor
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1 Answer

Answer :

Reciprocating compressor
Rotary compressor 
1. Compression of air takes place with help of piston and cylinder arrangement with reciprocating motion of piston.
1. Compression of air takes place due to rotary motion of blades.
2. Delivery of air intermittent.
2. Delivery of air is continuous.
3. Delivery pressure is high i.e. pressure ratio is high.
3. Delivery pressure is low, i.e. pressure ratio is low.
4. Flow rate of air is low.
4. Flow rate of air is high. 
5. Speed of compressor is low because of unbalanced forces.
5. Speed of compressor is high because of perfect balancing.
6. Reciprocating air compressor has more number of moving parts.
6. Rotary air compressor has less number of moving part.
7. It needs proper lubrication and more maintenance.
7. It required less lubrication and maintenance.
8. Due to low speed of ration it can’t be directly coupled to prime mover but it requires reduction of speed. 
8. Rotary air compressor can be directly coupled to prime mover.
9. It is used when small quantity of air at high pressure is required.
9. It is used where large quantity of air at lower pressure is required. 
10. Receiver Compulsory 
10. Receiver not compulsory
11. Mechanical Efficiency Low
11. Mechanical Efficiency High
12. More Starting torque required
12. Less Starting torque required
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