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7–34 A wellinsulated rigid tank contains 4 kg of a saturated
liquid–vapor mixture of water at 100 kPa. Initially, threequarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on H2O
4 kg
100 kPa Heat
95°F
Carnot heat engine FIGURE P7–28E FIGURE P7–34 cen54261_ch07.qxd 11/18/03 9:58 AM Page 336 336
FUNDAMENTALS OF THERMALFLUID SCIENCES until all the liquid in the tank is vaporized. Determine the
entropy change of the steam during this process. the pressure drops to 0.4 MPa. Determine (a) the final temperature in the cylinder and (b) the work done by the refrigerant. Answer: 16.19 kJ/K 7–40 7–35 A rigid tank is divided into two equal parts by a
partition. One part of the tank contains 1.5 kg of
compressed liquid water at 300 kPa and 60°C while the other
part is evacuated. The partition is now removed, and the water
expands to fill the entire tank. Determine the entropy change of
water during this process, if the final pressure in the tank is
15 kPa. Answer:...
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 Spring '09

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