Question

A piston–cylinder device initially contains steam at 3.0 MPa, superheated by 16.16°C. Now, steam loses heat to the surroundings and the piston moves down hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 200°C. Determine (a) the initial temperature (in °C, rounded off to first decimal place), (b) the magnitude (sign not required) of enthalpy change per unit mass of the steam by the time the piston first hits the stops (in kJ/kg, rounded off to nearest integer), (c) the quality (if mixture) (d) the overall enthalpy change per unit mass of the steam (in kJ/kg, rounded off to nearest integer) (e) the overall change in entropy.

Answer 1

Answer:

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