Using Energy Concepts and the Ideal Gas Model
One lb of oxygen, O2, undergoes a power cycle consisting of the following processes:
Process 1–2: Constant-volume heating from p1 = 20 lbf/in.2, T1 = 500°R to T2 = 820°R.
Process 2–3: Adiabatic expansion to v3 = 1.432v2.
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 lbf/in.2
(b) the temperature at state 3, in °R.
(c) the heat transfer and work, each in Btu, for all processes.
(d) the thermal efficiency of the cycle.
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