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Unformatted text preview: 7B Review Questions on Thermodynamics Kevin Schaeffer February 18, 2010 Ill go over the solutions this Sunday, February 21 from 2-4 in 155 Dwinelle. These questions are supposed to be difficult, so dont worry if you do not see how to do them at first. Theyre designed to make you think deeply about the concepts weve covered and to apply these ideas to some interesting examples. If you can do most of them, youll be in great shape for the midterm. 1 Engines in a Chain (a) Consider two engines, each with an efficiency given by e connected so heat Q h is added to the first, and the second is driven by the output heat Q c released by the first. Thus, the second heat engine operates off of the waste heat of the first engine, but both engines do work. Calculate the overall effeciency of the combined two-engine system. (b) Now suppose we have a chain of N engines set up as shown in Figure 1, and assume that all engines have the same efficiency, e. Find the overall efficiency....
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- Spring '08