(a) An ideal reversible Carnot engine is run backwards to serve as a refrigerator. If the refrigerator is to be maintained at -3 'C and the outside air is at 27 °C, what minimum amount of work must be done to remove 1 J of heat from inside the refrigerator? (b) In a power plant using superheated steam, the temperature in the steam generator is 600 °C. The intake river water used to cool the condenser is at 20 °C. What is the maximum efficiency such a plant could have?
(a) An ideal reversible Carnot engine is run backwards to serve as a refrigerator. If the refrigerator is to be maintained at -3 'C and the outside air is at 27 °C, what minimum amount of work must be done to remove 1 J of heat from inside the refrigerator? (b) In a power plant using superheated steam, the temperature in the steam generator is 600 °C. The intake river water used to cool the condenser is at 20 °C. What is the maximum efficiency such a plant could have?
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Transcribed Image Text:2 Efficiency
Use the first and second laws of thermodynamics to answer the following questions.
(a) An ideal reversible Carnot engine is run backwards to serve as a refrigerator. If the refrigerator is to be maintained
at -3 °C and the outside air is at 27°C, what minimum amount of work must be done to remove 1 J of heat from
inside the refrigerator?
(b) In a power plant using superheated steam, the temperature in the steam generator is 600 °Cc. The intake river water
used to cool the condenser is at 20 °C. What is the maximum efficiency such a plant could have?
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