A piston-cylinder system is filled with air. Initially, the air is at 495 kPa an

Question

A piston-cylinder system is filled with air. Initially, the air is at 495 kPa and 22°C. Then air is expanded to 2.3 times its original volume. Air is assumed to be an ideal gas. Assume the expansion process is isentropic.

(a) Find the change in entropy using constant specific heats at 300 K. __0__ kJ/kg·K

(b) Find the change in internal energy using constant specific heats at 300 K. _____ kJ/kg

(c) Find the change in entropy considering specific heats are temperature-dependent. __0__ kJ/kg·K

(d) Find the change in internal energy considering specific heats are temperature-dependent. _____ kJ/kg

Explanation / Answer

As the process is isentropic where the entropy remains constant. So, for (a) and (c) the answer would be zero.

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