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The following data were obtained from a performance test of a 10 x 9-cm single acting, water jacketed two-stage air compressor: Pressures: Atmospheric, 102 kPaa; leaving first-stage, 634 kPaa; leaving second-stage, 4.20 MPa. Temperatures: Atmospheric, 240C; leaving  first-stage, 1080C; entering 2nd stage, 250C; leaving 2nd stage, 1270C Compressor speed, 648 rpm Power input to motor, 5.65 kW Motor and belt efficiency, 81.5% The following are calculated from test data: Air flow rate, 0.387 ??⁄??? Compression exponents: 1st stage 1.15; 2nd Stage, 1.2 Calculate: a) Approximate indicated power b) Power for isothermal compression c) Shaft power d) 1st stage piston displacement e) Actual volumetric efficiency f) Isothermal compression efficiency g) Mechanical efficiency based on the approximate indicated power h) Over-all efficiency of the compressor

The following data were obtained from a performance test of a 10 x 9-cm single acting, water jacketed two-stage air compressor: Pressures: Atmospheric, 102 kPaa; leaving first-stage, 634 kPaa; leaving second-stage, 4.20 MPa. Temperatures: Atmospheric, 240C; leaving  first-stage, 1080C; entering 2nd stage, 250C; leaving 2nd stage, 1270C Compressor speed, 648 rpm Power input to motor, 5.65 kW Motor and belt efficiency, 81.5% The following are calculated from test data: Air flow rate, 0.387 ??⁄??? Compression exponents: 1st stage 1.15; 2nd Stage, 1.2 Calculate: a) Approximate indicated power b) Power for isothermal compression c) Shaft power d) 1st stage piston displacement e) Actual volumetric efficiency f) Isothermal compression efficiency g) Mechanical efficiency based on the approximate indicated power h) Over-all efficiency of the compressor

Refrigeration and Air Conditioning Technology (MindTap Course List)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter45: Domestic Refrigerators And Freezers
Section: Chapter Questions
Problem 20RQ: Welded ______sealed compressors are normally used in household refrigerators.
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The following data were obtained from a performance test of a 10 x 9-cm single acting, water jacketed two-stage air compressor: Pressures: Atmospheric, 102 kPaa; leaving first-stage, 634 kPaa; leaving second-stage, 4.20 MPa. Temperatures: Atmospheric, 240C; leaving  first-stage, 1080C; entering 2nd stage, 250C; leaving 2nd stage, 1270C Compressor speed, 648 rpm Power input to motor, 5.65 kW Motor and belt efficiency, 81.5%

The following are calculated from test data:

Air flow rate, 0.387 ??⁄???

Compression exponents: 1st stage 1.15; 2nd Stage, 1.2

Calculate:

a) Approximate indicated power

b) Power for isothermal compression

c) Shaft power

d) 1st stage piston displacement

e) Actual volumetric efficiency

f) Isothermal compression efficiency

g) Mechanical efficiency based on the approximate indicated power

h) Over-all efficiency of the compressor

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