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22 heat engines entropy and the second law of thermodynamics

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2.2 669 This is the Nearest One Head P U Z Z L E R The purpose of a refrigerator is to keep its contents cool. Beyond the attendant increase in your electricity bill, there is another good reason you should not try to cool the kitchen on a hot day by leaving the refrigerator door open. What might this reason be? (Charles D. Winters) c h a p t e r Heat Engines, Entropy, and the Second Law of Thermodynamics Chapter Outline 22.1 Heat Engines and the Second Law of Thermodynamics 22.2 Reversible and Irreversible Processes 22.3 The Carnot Engine 22.4 Gasoline and Diesel Engines 22.5 Heat Pumps and Refrigerators 22.6 Entropy 22.7 Entropy Changes in Irreversible Processes 22.8 (Optional) Entropy on a Microscopic Scale 669 670 CHAPTER 22 Heat Engines, Entropy, and the Second Law of Thermodynamics T he first law of thermodynamics, which we studied in Chapter 20, is a statement of conservation of energy, generalized to include internal energy. This law states that a change in internal energy in a system can occur as a result of energy transfer by heat or by work, or by both. As was stated in Chapter 20, the law makes no distinction between the results of heat and the results of work — either heat or work can cause a change in internal energy. However, an important distinction between the two is not evident from the first law. One manifestation of this distinction is that it is impossible to convert internal energy completely to mechanical energy by taking a substance ...
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