Question

Thermodynamics

A piston-cylinder device initially contains 1.5 kg steam at 5 MPa and 535°C. Now the steam loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains a saturated mixture with x=0.05. The cooling continues until the cylinder contains water at 165°C.

a. Sketch both p-v and T-v diagrams, (5 points); Then determine

b. The specific volume at starting state using the compressibility chart, and the percentage error % (5 points)

c. The final pressure (bar) and the quality (if mixture), (10 points)

d. The amount of heat transfer when the piston first hits the stops in kJ, (5points)

e. The total heat transfer and total boundary work in kJ. (10 points)


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