## Related questions with answers

Air enters a compressor operating at steady state at 1 bar, $22^{\circ} \mathrm{C}$ with a volumetric flow rate of $1 \mathrm{~m}^3 / \mathrm{min}$ and is compressed to $4 \mathrm{bar}, 177^{\circ} \mathrm{C}$. The power input is $3.5 \mathrm{~kW}$. Employing the ideal gas model and ignoring kinetic and potential energy effects, obtain the following results:

(a) For a control volume enclosing the compressor only, determine the heat transfer rate, in $\mathrm{kW}$, and the change in specific entropy from inlet to exit, in $\mathrm{kJ} / \mathrm{kg} \cdot \mathrm{K}$. What additional information would be required to evaluate the rate of entropy production?

(b) Compute the rate of entropy production, in $\mathrm{kW} / \mathrm{K}$, for an enlarged control volume enclosing the compressor and a portion of its immediate surroundings so that heat transfer occurs at the ambient temperature, $22^{\circ} \mathrm{C}$.

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