Applying the Energy Balance
A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant-volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid–vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects.
(a) Sketch T–v and p–v diagrams showing the key states and the processes.
(b) Determine the work and heat transfer for each process, all in Btu.
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