## Question

###### Thermo

Steam at 20 bars is in the saturated vapor state (call this state 1) and contained in a pistoncylinder device with a volume of 0.03 m 3 . Assume the steam is cooled atconstant 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 itsvolume 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, ~21.6 kJ/kg.

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