Air enters a compressor at ambient conditions of 100 kPa and 27 C with a low velocity and exits at...

Question

Air enters a compressor at ambient conditions of 100 kPa and 27 C with a low velocity and exits at 1MPa, 327 C and 100m/s. The compressor is cooled by the ambient air at 27 C at a rate of 1580 kJ/min. The power input to the compressor is 300 kW.C and 100m/s. The compressor is cooled by the ambient air at 27 C at a rate of 1580 kJ/min. The power input to the compressor is 300 kW.

(a) The specific enthalpies of the air at the compressor inlet and outlet.

(b) The mass flow rate of air.

(c) The change of specific entropy of the air from inlet to outlet.inlet to outlet.

(d) The total entropy change of the air from inlet to outlet.

(e) The entropy change of the surrounding.

(f) The rate of entropy generation of the combined system.

(g) How much work input I required if the process is isentropic (assuming the same mass flow rate)?

Robert · Accepted Answer

Air enters a compressor at ambient conditions of 100 kPa and 27 C with a low velocity and 
exits at 1MPa, 327 C and 100m/s. The compressor is cooled by the ambient air at 27 C at a 
rate of 1580 kJ/min. The power input to the compressor is 300 kW and 100 m/s.
                            
 
 
                     
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a) The specific enthalpies of the air at the compressor inlet and outlet.

Air enters a compressor at ambient conditions of 100 kPa and 27 C with a low velocity and exits at 1MPa, 327 C and 100m/s. The compressor is cooled by the ambient air at 27 C at a rate of 1580 kJ/min....

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