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Question

Air is compressed in an axial-flow compressor operating at steady state from $27^{\circ} \mathrm{C}, 1$ bar to a pressure of $2.1$ bar. The work input required is $94.6 \mathrm{~kJ}$ per $\mathrm{kg}$ of air flowing through the compressor. Heat transfer from the compressor occurs at the rate of $14 \mathrm{~kJ}$ per kg at a location on the compressor's surface where the temperature is $40^{\circ} \mathrm{C}$. Kinetic and potential energy changes can be ignored. Find

(a) the temperature of the air at the exit, in ${ }^{\circ} \mathrm{C}$.

(b) the rate at which entropy is produced within the compressor, in $\mathrm{kJ} / \mathrm{K}$ per $\mathrm{kg}$ of air flowing.

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