E10-MSE-B_PS5_solns - E10 Problem Set #5 Solutions...

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E10 – Problem Set #5 Solutions Materials Science and Engineering Module on Batteries and Fuel Cells Was due: 5:10PM on Wednesday, November 24, 2010 1 of 2 1. Efficiency of a propane generator. a) If the temperature of the combusted gases in the engine is 600 ° C and the exhaust temperature is 200 ° C, what is the maximum percentage of energy you could get from the combustion of the propane? The theoretical efficiency of a heat engine can be calculated using the equation below if you know the temperature it starts and exhausts at in Kelvin. H L T T = 1 η T L =200+273=473K T H =600+273=873K η a = 1 - (473/873) = 0.458 = 45.8% b) Suppose we use the exhaust gas to heat water to steam at 200 ° C, and then use that to run a turbine, such that the temperature of the steam after the turbine is 100 ° C. What is the maximum percentage of energy you could get from the ‘leftover’ propane heat? T
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This note was uploaded on 02/05/2011 for the course E 10 taught by Professor Righter during the Spring '08 term at University of California, Berkeley.

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E10-MSE-B_PS5_solns - E10 Problem Set #5 Solutions...

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