Answer: An insulated vertical pistoncylinder device

Chapter 8, Problem 878

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An insulated vertical pistoncylinder device initially contains 15 kg of water, 13 kg of which is in the vapor phase. The mass of the piston is such that it maintains a constant pressure of 300 kPa inside the cylinder. Now steam at 2 MPa and 4008C is allowed to enter the cylinder from a supply line until all the liquid in the cylinder is vaporized. Assuming the surroundings to be at 258C and 100 kPa, determine (a) the amount of steam that has entered and (b) the exergy destroyed during this process.

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