Chapter 5, Problem 5.29P

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TH=S2SK OH=1050K Weycle Tc=350K @c= 700KJ A system executes a power cycle while receiving 1050 kJ by heat transfer at a temperature of 525 K and discharging 700 kJ by heat transfer at 350 K. There are no other heat transfers. Determine whether the cycle is internally reversible, irreversible, or impossible. O internally reversible impossible irreversible

A refrigeration machine rejects QH = 680 Btu per cycle to a hot reservoir at TH = 540°R, while receiving Qc = 483.0 Btu per cycle from a cold reservoir at temperature Tc. The machine operates at 10 cycles per minute. Determine the net power input, in hp, the minimum theoretical temperature Tc, in °R, and the maximum coefficient of performance of the cycle. tep 1 Determine the net power input, in hp. W cycle i hp

8Q Prove that, whenever a system undergoes a cycle, p<0 (b) T.

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A refrigeration machine rejects QH = 620 Btu per cycle to a hot reservoir at TH = 540°R, while receiving Qc = 447.0 Btu per cycle from a cold reservoir at temperature Tc. The machine operates at 10 cycles per minute. Determine the net power input, in hp, the minimum theoretical temperature Tc, in °R, and the maximum coefficient of performance of the cycle. Step 1 Determine the net power input, in hp. W. i hp cycle =

As shown in the figure below, two reversible cycles arranged in series each produce the same net work, Weycle: The first cycle receives energy QH by heat transfer from a hot reservoir at TH = 1000°R and rejects energy Q 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 Tand rejects energy Qc by heat transfer to a reservoir at Tc = 450°R. All energy transfers are positive in the directions of the arrows. Hot reservoir at TH R1 W cycle Reservoir at T W cycle R2 Cold reservoir at Te Determine: (a) the intermediate temperature T, in °R, and the thermal efficiency for each of the two power cycles. (b) the thermal efficiency of a single reversible power cycle operating between hot and cold reservoirs at 1000°R and 450°R, respectively. Also, determine the ratio of the net work developed by the single cycle to the net work developed by each of the two cycles, Wcycle

Find the mean effective pressure of the thermodynamic cycle shown in the figure below.

2. . Two reversible engines A and B operate in series. Engine A receives heat at 500 °C and rejects heat to a reservoir at temperature T. Engine B receives the heat rejected by the first engine and, in turn, rejects heat to a thermal reservoir at 20 °C. Determine the temperature T (°C) for the following situations: (i). The work outputs of the two engines are equal (ii). The thermal efficiencies of the two engines are equal