Using Energy Concepts and the Ideal Gas ModelA
Chapter 3, Problem 141P(choose chapter or problem)
A piston-cylinder assembly contains air modeled as an ideal gas with a constant specific heat ratio, k =1.4. The air undergoes a power cycle consisting of four processes in series:
Process 1-2: Constant-temperature expansion at \(600 \mathrm{~K}\) from \(p_1=0.5 \mathrm{MPa}\) to \(p_2=0.4 \mathrm{MPa}\).
Process 2-3: Polytropic expansion with n = k to \(p_3=0.3 \mathrm{MPa}\).
Process 3-4: Constant-pressure compression to \(V_4=V_1\).
Process 4-1: Constant-volume heating.
Sketch the cycle on a p-v diagram. Determine (a) the work and heat transfer for each process, in \(\mathrm{kJ} / \mathrm{kg}\), and (d) the thermal efficiency.
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