Using Energy Concepts and the Ideal Gas Model
A system consists of 2 kg of carbon dioxide gas initially at state 1, where p1 = 1 bar, T1 = 300 K. The system undergoes a power cycle consisting of the following processes:
Process 1–2: Constant volume to p2 = 4 bar.
Process 2–3: Expansion with pv1.28 = constant.
Process 3–1: Constant-pressure compression.
Assuming the ideal gas model and neglecting kinetic and potential energy effects,
(a) sketch the cycle on a p–v diagram and calculate thermal efficiency.
(b) plot the thermal efficiency versus p2 / p1 ranging from 1.05 to 4.
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