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)?
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter45: Domestic Refrigerators And Freezers
Section: Chapter Questions
Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.
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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)?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F07120993-045a-4784-b3c9-11782f757bcc%2F62e64fe5-9bf2-4f1a-a13e-7ace568df5ea%2Fj2zsxre_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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