Chapter 5, Problem 5.96EP

As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc by heat transfer to a cold reservoir at Tc. Hot reservoir at TH Boundary- R Wa cycle Cold reservoir2c at Te (a) If TH = 1100 K and Tc = 400 K, what is the thermal efficiency? (b) If TH = 500°C, Tc = 20°C, and Wcycle = 1000 kJ, what are QH and Qc, each in kJ? (c) If n = 60% and Tc = 40°F, what is TH, in °F? (d) If ŋ = 40% and TH = 727°C, what is Tc, in °C?

Figure below shows a reversible heat engine ER having heat interactions with three constant temperature systems. Calculate the thermal efficiency of the heat engine T= 1000 K T,= 500 K T= 300 K Q, = 50 kJ Q, = 100 kJ %3D Q, ER W

Two reversible cycles are in series, each process doing the same net work, Wcycle. The first cycle receives energy QH by heat transfer from a hot reservoir at 1000°R and energy Q is reinjected by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and reinjects the QC energy by heat transfer to the reservoir at a temperature of 400°R. All energy transferred is positive in the direction of the arrow. Determine: a) the intermediate temperature T, in °R, and the thermal efficiency for each of the two cycles; b) the thermal efficiency of a simple reversible cycle operating between the hot and cold reservoirs at 1000°R and 400°C, respectively. Then determine the net work done by the simple cycle, expressed in terms of the net work done by each of the two cycles, Wcycle.

As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc by heat transfer to a cold reservoir at Tc. Hot reservoir 2 at TH Boundary Weycle - Cold reservoir 20 at Te (a) If TH = 1100 Kand Tc = 400 K, what is the thermal efficiency? (b) If TH = 500°C, Tc = 20°C, and Weycle = 200 kJ, what are QH and Qc, each in kJ? (c) If n = 70% and Tc = 40°F, what is TH, in °F? (d) If n = 40% and TH = 727°C, what is Tc, in °C?

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Q.1 A refrigerator is being driven by a heat engine and coefficient of performance of refrigerator is 4.The heat taken by the refrigerator is 3500 kJ and the combined engine and refrigerator work output is 300 kJ.The work output (in KJ) of the heat engine is

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)?

Q2 (a) Describe briefly four characteristics of a heat engine. Sketch a simple diagram of a heat engine to show the process and direction of heat and work.

As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy QC by heat transfer to a cold reservoir at TC. (a) If TH = 1600 K and TC = 400 K, what is the thermal efficiency?(b) If TH = 500°C, TC = 20°C, and Wcycle = 1000 kJ, what are QH and QC, each in kJ?(c) If η = 70% and TC = 40°F, what is TH, in °F?(d) If η = 40% and TH = 1027°C, what is TC, in °C?