6. A free piston-cylinder system initially contains 10 kg compressed liquid water at 200 kPa and 90 °C.A resister heater is now turned on to heat the water until the temperature of water reaches 150 °C.During this process, the heat loss from water to ambient air (25 °C) is 200 kJ. You can ignore the changes in potential energy and kinetic energy of water (20 Points).

(c) Determine the boundary work and electrical energy consumed during this process. (10 points)

(b) Present this process in both P-¥ and T-¥diagram. (5 points)

(a) Find the phase of water at the initial and final states. (5 Points)



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