BIOLOGICAL APPLICATION As far as we know, Nature has never

Chapter , Problem 37

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BIOLOGICAL APPLICATION As far as we know, Nature has never evolved a heat engineSteven Vogel, Lifes Devices (Princeton University Press, 1988). (a) Calculate the efficiency of a heat engine operating between body temperature and a typical outdoor temperature and compare this to the human bodys efficiency for converting chemical energy into work (approximately 20 percent). Does this efficiency comparison contradict the second law of thermodynamics? (b) From the result of Part (a), and a general knowledge of the conditions under which most warm-blooded organisms exist, give a reason why no warmblooded organisms have evolved heat engines to increase their internal energies.

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