Connecting the statistical and macroscopic approaches to irreversible processes
Maximum efficiencies Determine the maximum efficiencies of the thermodynamic engines described below. (a) Burning coal heats the gas in the turbine of an electric power plant to 700 K. After turning the blades of the generator, the gas is cooled in cooling towers to 350 K. (b) An inventor claims to have a thermodynamic engine that attaches to a car’s exhaust system. The temperature of the exhaust gas is 90 °C and the temperature of the output of this proposed heat engine is 20 °C. (c) Near Bermuda, ocean water is about 24 °C at the surface and about 10 °C at a depth of 800 m.
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