Heat engine and refrigerator. Consider a heat engine operating between temperatures Th and Tj. During each cycle with time At, work W is extracted, so Pout = W/At. (a) Assuming the processes are all reversible, what is the efficiency of this heat engine, n = Wout/Qn? (b) Now assume that the low temperature of the heat engine is lowered by a reversible refrigerator, such that the heat engine operates between Th and T. The refrigerator takes input power Pin = Win/At and operates between T and Ti, where T < TỊ. Draw an energy- entropy flow diagram. (c) Calculate the net efficiency (Wout - Win)/Qh. Is the efficiency of this system higher, lower, or the same as your answer for (a)?

Heat engine and refrigerator. Consider a heat engine operating between temperatures Th and Tj. During each cycle with time At, work W is extracted, so Pout = W/At. (a) Assuming the processes are all reversible, what is the efficiency of this heat engine, n = Wout/Qn? (b) Now assume that the low temperature of the heat engine is lowered by a reversible refrigerator, such that the heat engine operates between Th and T. The refrigerator takes input power Pin = Win/At and operates between T and Ti, where T < TỊ. Draw an energy- entropy flow diagram. (c) Calculate the net efficiency (Wout - Win)/Qh. Is the efficiency of this system higher, lower, or the same as your answer for (a)?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

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Heat engine and refrigerator. Consider a heat engine operating between temperatures Th and
Tj. During each cycle with time At, work W is extracted, so Pout = W/At.
(a) Assuming the processes are all reversible, what is the efficiency of this heat engine, n =
Wout/Qn?
(b) Now assume that the low temperature of the heat engine is lowered by a reversible
refrigerator, such that the heat engine operates between Th and T. The refrigerator takes
input power Pin = Win/At and operates between T and T, where Ti < T. Draw an energy-
entropy flow diagram.
(c) Calculate the net efficiency (Wout - Win)/Qh. Is the efficiency of this system higher, lower, or
the same as your answer for (a)?

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