One lb of oxygen, O2, undergoes a power cycle consisting
Chapter 3, Problem 3.145(choose chapter or problem)
One lb of oxygen, O2, undergoes a power cycle consisting of the following processes:
Process 1–2: Constant-volume heating from \(p_{1}=20 \mathrm{lbf} / \mathrm{in.}^{2}\), \(T_{1}=500^{\circ} \mathrm{R} \text { to } T_{2}=820^{\circ} \mathrm{R}\).
Process 2–3: Adiabatic expansion to \(v_{3}=1.432 v_{2}\).
Process 3–1: Constant-pressure compression to state 1.
Sketch the cycle on a p–v diagram. Assuming ideal gas behavior, determine
(a) the pressure at state 2, in \(\mathrm{lbf} / \mathrm{in}^{2}\)
(b) the temperature at state 3, in \({ }^{\circ} \mathrm{R}\).
(c) the heat transfer and work, each in Btu, for all processes.
(d) the thermal efficiency of the cycle.
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