solution

solution.


A gas undergoes a thermodynamic cycle consisting of three processes:

Process 1–2: compression with pV  constant, from p1  1 bar, V1  1.6 m3 to V2  0.2 m3 , U2  U1 0

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Process 2–3: constant pressure to V3 V1

Process 3–1: constant volume, U1  U3  3549 kJ

There are no significant changes in kinetic or potential energy. Determine the heat transfer and work for Process 2–3, in kJ. Is this a power cycle or a refrigeration cycle?

A closed system undergoes a thermodynamic cycle consisting of the following processes:

Process 1–2: adiabatic compression with pV1.4  constant from p1  50 lbf/in.2 , V1  3 ft3 to V2  1 ft

Process 2–3: constant volume

Process 3–1: constant pressure, U1  U3 46.7 Btu

There are no significant changes in kinetic or potential energy.

(a) Sketch the cycle on a p–V diagram.

(b) Calculate the net work for the cycle, in Btu.

(c) Calculate the heat transfer for process 2–3, in Btu.

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