Classification of compressors, Uses of compressed air, Reciprocating compressor, Operation of compressor, Work of compression, Power required, Reciprocating compressor efficiencies, Comparison between Reciprocating and Rotodynamic compressors

1. Branch : Electronics & communication Engineering
Group Members:
Sem: 02
Batch: E3.

8. Air
Compressor

9.  In refrigeration cycle
 Operating pneumatic tools like drill hammer, riveting machine ,etc .
 Filling air in automobile tiers
 Pumping of water
 Spray painting
 Gas turbine power plant
 For sand blasting
 Operating blast furnace
 Increasing inlet pressure of I.C engine
 To operate air motors in mines where fire risks is more
 Operating air brakes used in buses, trucks, trains, etc
 Conveying the material like sand and concrete along pipe line

15. Work for
Compression

16. cycle
J
p
p
V
V
p
n
n
W
n
n
/
1
)
(
1
1
1
2
4
1
1
























1
1
1
1
2
1
1 




















p
p
V
p
W

17. 


























1
2
1
2
2
2
1
2
1
1 log
log
log
p
p
pV
p
p
V
p
p
p
V
p
W e
e
e

18. cycle
J
p
p
V
V
p
n
n
W
n
n
/
1
)
(
1
1
1
2
4
1
1























cycle
J
p
p
V
p
p
p
V
p
W /
1
1
1
1
1
1
2
4
1
1
1
2
1
1





















































19. cycle
J
p
p
RT
m
n
n
W
n
n
ad /
1
1
1
1
2
1























23. What is Rotary Compressors?

24. Classification of Rotary
Compressors
Rotary
Positive
displacement
Roots
blower
Vane type
blower
Screw
compressor
or
blower
Dynamic
Centrifugal Axial flow

27. 





28.  It operates with two helical rotors
that rotate toward each other,
causing the teeth to mesh.
 As the left rotor turns clockwise,
the right rotor rotates
counterclockwise.
 This forces the gases to become
trapped in the central cavity.
 The two rotors are attached to a
drive shaft & drive that provide
energy to operate the compressor.
 Have an inlet suction line & outlet
discharge port.

32.  High efficiencies approaching
two-stage reciprocating
compressors.
 Its pressure can reach up to
1200 psi.
 Completely packaged for
instrument air up through 500
hp.
 Relative first cost improves
as size increases.
 Designed to give lubricant
free air.
 Does not require special
foundation.
 High initial cost.
 Complicated monitoring and
control systems.
 Limited capacity control
modulation, required
unloading for reduced
capacities.
 High rotational speeds
require special bearings and
vibration & clearance
monitoring.
 Specialized maintenance
considerations.