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Reciprocating Compressor

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Reciprocating Compressor Reciprocating compressors are the best known and most widely used compressors of the positive displacement type. They operate on the same ... – PowerPoint PPT presentation

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Title: Reciprocating Compressor


1
Reciprocating Compressor 
2
  • Reciprocating compressors are the best known and
    most widely used compressors of the positive
    displacement type.
  • They operate on the same principle as the old,
    familiar bicycle pump, that is, by means of a
    piston in a cylinder.
  • As the piston moves forward in the cylinder, it
    compresses the air or gas into a smaller space,
    thus raising its pressure.

3
Multistage, double-acting reciprocating
compressor in V arrangement
4
Pressure volume diagram for a reciprocating
compressor with clearance neglected
5
Compression process on a p-v diagram
6
Example 1 A single-stage reciprocating
compressor takes 1 m3 of air per minute at 1.013
bar and 15C and delivers it at 7 bar. Assuming
that the law of compression is pV1.35 constant,
and that clearance is negligible, calculate the
indicated power.
7
Shaft power indicated power friction power
8
Example 2 If the compressor of Example 1 is to
be driven at 300 rev/min and is a single-acting,
single-cylinder machine, calculate the cylinder
bore required, assuming a stroke to bore ratio of
1.5/1. Calculate the power of the motor required
to drive the compressor if the mechanical
efficiency of the compressor is 85 and that of
the motor transmission is 90.
9
The condition for minimum work
Possible compression processes on a p-v diagram
10
Isothermal efficiency
11
Example 3 Using the data of Example 1 calculate
the isothermal efficiency of the ompressor.  
12
Isothermal, polytropic, and isentropic
compression processes on a T-s diagram
13
Reciprocating compressors including clearance
Ideal indicator diagram for a reciprocating
compressor with clearance
14
Compression and re-expansion of masses of gas in
a reciprocating compressor
15
Example 4 A single-stage, double-acting air
compressor is required to deliver 14 m3 of air
per minute measured at 1.013 bar and 15C. The
delivery pressure is 7 bar and the speed 300
rev/rnin. Take the clearance volume as 5 of
the swept volume with a compression and
re-expansion index of n 1.3. Calculate the
swept volume of the cylinder, the delivery
temperature, and the indicated power.
16
Actual indicator diagram for a reciprocating
compressor
17
Volumetric efficiency, ?v
?v the mass of gas delivered, divided by the
mass of gas which would fill the swept volume at
the free air conditions of pressure and
temperature . or ?v the volume of gas
delivered measured at the free air pressure and
temperature, divided by the swept volume of the
cylinder.
18
Indicator diagram for a reciprocating compressor 
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