FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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is q in < q out in power cycles, heat pump cycles, or refrigeration cycles?
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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