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Practical steam engines utilize 450ºC steam, which is
Chapter 15, Problem 32(choose chapter or problem)
Problem 32PE
Practical steam engines utilize 450ºC steam, which is later exhausted at 270ºC . (a) What is the maximum efficiency that such a heat engine can have? (b) Since 270ºC steam is still quite hot, a second steam engine is sometimes operated using the exhaust of the first. What is the maximum efficiency of the second engine if its exhaust has a temperature of 150ºC ? (c) What is the overall efficiency of the two engines? (d) Show that this is the same efficiency as a single Carnot engine operating between 450ºC and 150ºC . Explicitly show how you follow the steps in the Problem-Solving Strategies for Thermodynamics.
Questions & Answers
QUESTION:
Problem 32PE
Practical steam engines utilize 450ºC steam, which is later exhausted at 270ºC . (a) What is the maximum efficiency that such a heat engine can have? (b) Since 270ºC steam is still quite hot, a second steam engine is sometimes operated using the exhaust of the first. What is the maximum efficiency of the second engine if its exhaust has a temperature of 150ºC ? (c) What is the overall efficiency of the two engines? (d) Show that this is the same efficiency as a single Carnot engine operating between 450ºC and 150ºC . Explicitly show how you follow the steps in the Problem-Solving Strategies for Thermodynamics.
ANSWER: