A piston/cylinder device operating in a cycle with steam as the working fluid

Chapter 6, Problem 6.38

(choose chapter or problem)

A piston/cylinder device operating in a cycle with steam as the working fluid executes
the following steps:
? Steam at 550 kPa and 200°C is heated at constant volume to a pressure of 800 kPa.
? It then expands, reversibly and adiabatically, to the initial temperature of 200°C.
? Finally, the steam is compressed in a mechanically reversible, isothermal process
to the initial pressure of 550 kPa.
What is the thermal efficiency of the cycle?

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