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Solved: Consider the combination of a heat engine and a
Chapter 5, Problem 136EUP(choose chapter or problem)
Problem 136EUP
Consider the combination of a heat engine and a heat pump, as given in Problem 5.41, with a low temperature of 720 R. What should the high temperature be so that the heat engine is reversible? For that temperature, what is the COP for a reversible heat pump?
Problem 5.41
Consider a heat engine and heat pump connected as shown in Fig. P5.41. Assume that TH1 = TH2 > Tamb and determine for each of the three cases if the setup satisfies the first law and/or violates the second law.
FIGURE P5.41
Questions & Answers
QUESTION:
Problem 136EUP
Consider the combination of a heat engine and a heat pump, as given in Problem 5.41, with a low temperature of 720 R. What should the high temperature be so that the heat engine is reversible? For that temperature, what is the COP for a reversible heat pump?
Problem 5.41
Consider a heat engine and heat pump connected as shown in Fig. P5.41. Assume that TH1 = TH2 > Tamb and determine for each of the three cases if the setup satisfies the first law and/or violates the second law.
FIGURE P5.41
ANSWER:
Solution 136EUP
Step 1 of 2
We are required to calculate the reversible heat engine’s high temperature. We are also required to calculate the COP of the reversible heat engine for the calculated temperature.