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Chapter 21: Q. 1 (page 594)
A heat engine does of work per cycle while exhausting of waste heat. What is the engine鈥檚 thermal efficiency?
The thermal efficiency is
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Do the energy-transfer diagrams inrepresent possible refrigerators? If not, what is wrong?
A heat engine doesof work and exhaustsof waste heat during each cycle.
a. What is the engine's thermal efficiency?
b. If the cold-reservoir temperature is , what is the minimum possible temperature in of the hot reservoir?
The ideal gas in a Carnot engine extracts of heat energy during the isothermal expansion at . How much heat energy is exhausted during the isothermal compression at
A typical coal-fired power plant burns metric tons of coal every hour to generate of electricity. metric ton = . The density of coal is 1500 kg/m3 and its heat of combustion is . Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electric energy.
a. Suppose the coal is piled up in a room. How tall must the pile be to operate the plant for one day?
b. What is the power plant鈥檚 thermal efficiency?
Rank in order, from largest to smallest, the thermal efficiencies to of the four heat engines in FIGURE Q21.5. Explain.
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