Air flows steadily at the rate of 30 kg/min through an air compressor entering at a velocity of 7 m/ pressure of 100 kPa and a specific volume of 0.95 m°/kg. The internal energy of the air leaving compressor is 90 kJ/kg greater than that of the air entering. The air leaves at a velocity of 5 m/s, a pressure of 700 kPa and a specific volume of 0.19 m°/kg. Cooling water in the compressor jackets

Elements Of Electromagnetics
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9. Air flows steadily at the rate of 30 kg/min through an air compressor entering at a velocity of 7 m/s, a
pressure of 100 kPa and a specific volume of 0.95 m /kg. The internal energy of the air leaving
compressor is 90 kJ/kg greater than that of the air entering. The air leaves at a velocity of 5 m/s, a
pressure of 700 kPa and a specific volume of 0.19 m/kg. Cooling water in the compressor jackets
absorbs heat from the air at the rate of 58 kW.
(a) Calculate the rate of shaft work in kW. Ans. 122 kW
(b) Find the ratio of inlet pipe diameter to outlet pipe diameter.
Ans. 1.89
Transcribed Image Text:9. Air flows steadily at the rate of 30 kg/min through an air compressor entering at a velocity of 7 m/s, a pressure of 100 kPa and a specific volume of 0.95 m /kg. The internal energy of the air leaving compressor is 90 kJ/kg greater than that of the air entering. The air leaves at a velocity of 5 m/s, a pressure of 700 kPa and a specific volume of 0.19 m/kg. Cooling water in the compressor jackets absorbs heat from the air at the rate of 58 kW. (a) Calculate the rate of shaft work in kW. Ans. 122 kW (b) Find the ratio of inlet pipe diameter to outlet pipe diameter. Ans. 1.89
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