A rigid tank of volume 0.5 m3 is connected to a piston–cylinder assembly by a valve, as shown below. Both vessels contain pure water. They are immersed in a constant-temperature bath at 200ºC and 600 kPa. Consider the tank and the piston–cylinder assembly as the system and the constanttemperature bath as the surroundings. Initially the valve is closed and both units are in equilibrium with the surroundings (the bath). The rigid tank contains saturated water with a quality of 95% (i.e., 95% of the mass of water is vapor). The piston–cylinder assembly initially has a volume of 0.1 m3.

The valve is then opened. The water fl ows into the piston–cylinder until equilibrium is obtained.
For this process, determine the work done, W, by the piston; the change in internal energy, ΔU, of the system; and the heat transferred, Q.

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Surroundings Pure HO V = 0.5 m Quality = 95% Temperature bath TB = 200C P = 600 kPa HO Vinitial = 0.1 m