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 PV VAPOR VAPOR VAPORIZATION VAPORIZATION CC hu == ⋅° ∆= Water Properties Calculate the total heat transfer for the vessel contents.
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2. The sketch below shows a water pumping station that you are to design. The application requires that 1000 liter/min water will enter the pump at 150 kPa. Downstream and 75 m above the pump inlet, the pressure will be 400 kPa. You have made some friction loss calculations and estimate that friction loss will be 175 J/kg water. You are assuming that the velocity change is negligible. The density of water is 1.00 g/cm 3 and its molecular weight is 18.02. Calculate the required pump power in kW. 1 2 P 1 = 150 kPa P 2 = 400 kPa 75 m
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3. Propane vapor at 50 o F and 60 psi enters a heat exchanger at a mass flow rate of 1000 lb m /h.
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This note was uploaded on 07/05/2008 for the course CPE 111 taught by Professor Weatherley during the Spring '08 term at Kansas.

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

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