Problem

Applying the Exergy Balance: Control VolumesFor the air compressor of Problem 7.66, perfor...

Applying the Exergy Balance: Control Volumes

For the air compressor of Problem 7.66, perform a full exergy accounting, in kJ per kg of air flowing, based on the work input.

Problem 7.66

Applying the Exergy Balance: Control Volumes at Steady State

Air is compressed in an axial-flow compressor operating at steady state from 27°C, 1 bar to a pressure of 2.1 bar. The work required is 94.6 kJ per kg of air flowing. Heat transfer from the compressor occurs at an average surface temperature of 40°C at the rate of 14 kJ per kg of air flowing. The effects of motion and gravity can be ignored. Let T0 = 20°C, p0 = 1 bar. Assuming ideal gas behavior, determine (a) the temperature of the air at the exit, in °C, and (b) the rate of exergy destruction within the compressor, in kJ per kg of air flowing.

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