Using Energy Concepts and the Ideal Gas Model
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 K from p1 = 0.5 MPa to p2 = 0.4 MPa.
Process 2–3: Polytropic expansion with n = k to p3 = 0.3 MPa.
Process 3–4: Constant-pressure compression to V4 = V1.
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 kJ/kg, and (d) the thermal efficiency.
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