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CPE 111 PRACTICE QUESTIONS-2007

CPE 111 PRACTICE QUESTIONS-2007 - CPE 111 PRACTICE...

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CPE 111 PRACTICE QUESTIONS 1. The vessel shown in the diagram to the right originally contains 120 lb m of water vapor at 250 ºF. The vessel contents are cooled to a final temperature of 150 ºF, and 21.43 % of the vapor condenses to form a liquid. No material enters or leaves the vessel. The table below summarizes the properties of water. Molecular Weight = 18.02 Btu Btu 18.15 18.13 lbmole F lbmole F Btu Btu 7.39 5.59 lbmole F lbmole F Btu Btu 18,170 16,960 lbmole lbmole LIQUID LIQUID P V VAPOR VAPOR P V VAPORIZATION VAPORIZATION C C C C h u = = ⋅° ⋅° = = ⋅° ⋅° = = Water Properties Calculate the total heat transfer for the vessel contents.
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