# Determine the entropy change of the steam during this

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Unformatted text preview: sults. 7–34 A well-insulated 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 THERMAL-FLUID 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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## This document was uploaded on 11/28/2012.

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