Steam at 20 bars is in the saturated vapor state (call this state 1) and contain
ID: 1848578 • Letter: S
Question
Steam at 20 bars is in the saturated vapor state (call this state 1) and contained in a piston-cylinder device with a volume of 0.03 m3. Assume the steam is cooled at constant volume (i.e. the piston is held fixed in place) until the temperature reaches 200 C (call this state 2). Then the steam is expanded isothermally until its volume is twice the initial value (state 3).(a) Determine the pressures at state 2 and 3. ans. 15.5 bar, ~10 bar
(b) Determine the change in specific internal energy, u, for each of the two processes.
ans.-389 kJ/kg, 410 kJ/kg
Explanation / Answer
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