Explanation Given info: The engines are operating between the temperatures 450 K and 300 K , the heat input of design A , B and C are 800 J , 2500 J and 3500 J respectively and the work output of engines in each design is 1000 J . Write the expression for the maximum efficiency of a heat engine Eff ( max ) = ( 1 − T cold T hot ) × 100 % Here, Eff ( max ) is the efficiency of the engine T cold is the temperature of the cold reservoir or the exhaust T hot is the temperature of the hot reservoir or the source Substitute 450 K for T hot and 300 K for T cold to find the maximum efficiency of the engines. Eff ( max ) = ( 1 − 300 K 450 K ) × 100 % = 33 % Therefore, the heat engines in each design can have an efficiency of 33 % maximum. Write the expression for the efficiency in in terms of work done and heat supplied to the engine. Eff = ( W Q ) × 100 % Here, W is the work done by the engine Q is the input heat Substitute 800 J for Q and 1000 J for W to find the efficiency of engine in design A

15th Edition

ISBN: 9780077510534

Author: KRAUSKOPF

Publisher: Mcgraw-hill Higher Education (us)

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Chapter 5, Problem 98E

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Which among the given proposal is to be chosen as the heat engine.

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Chapter 5, Problem 97E

Chapter 5, Problem 99E

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Which among the given proposal is to be chosen as the heat engine .

Solution Summary: The author explains that the design C can be chosen as the practically possible heat engine.

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