A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a...
A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 2000 K and rejects energy QC by heat transfer to a cold reservoir at TC = 400 K. For each of the following cases determine whether the cycle operates reversibly, operates irreversibly, or is impossible.
(a) QH = 1000 kJ, ƞ = 60%
(b) QH = 1000 kJ, Wcycle = 850 kJ
(c) QH = 1000 kJ, QC = 200 kJ
Homework Answers
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A power cycle operating between two thermal reservoirs receives
energy QH by heat transfer from a...
5.43 A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and re...
5.43
A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and rejects energy QH to a hot reservoir at TH = 315 K, For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: QC = 1000 kJ, Wcycle = 80 kJ. QC = 1200 kJ. QH = 2000 kJ. QH = 1575 kJ. Wcycle = 200 kJ. beta = 6.
As shown in the figure, a reversible power cycle receives energy QH by heat transfer from...
As shown in the figure, 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, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
A power cycle receives energy QH from a high temperature energy source at TH and rejects...
A power cycle receives energy QH from a high temperature energy source at TH and rejects energy QL by heat transfer to a low temperature energy sink at TL = 400 K. For each of the following cases determine whether the cycle operate reversibly, irreversibly, or is impossible. (a) QH = 1200 kJ, Wcycle = 1020 kJ. (b) QH = 1200 kJ, QL = 240 kJ. (c) Wcycle = 1400 kJ, QL = 600 kJ. (d) ?=40%.
A reversible power cycle whose thermal efficiency is 39% receives 50 kJ by heat transfer from a hot reservoir at 310oC...
A reversible power cycle whose thermal efficiency is 39% receives 50 kJ by heat transfer from a hot reservoir at 310oC and rejects energy by heat transfer to a cold reservoir at temperature TC. Determine the energy rejected, in kJ, and TC, in oC. Determine the entropy production for the cycle, σcycle, in kJ/K.
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a...
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a hot reservoir at 600 K and rejects energy by heat transfer to a coldreservoir at temperature Tc. Determine the energy rejected in KJ
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
(Clausius Inequality) A thermodynamic cycle operates at steady state between reservoirs at 1000 K and 500...
(Clausius Inequality) A thermodynamic cycle operates at steady state between reservoirs at 1000 K and 500 K. The cycle receives energy via heat transfer at the high temperature at a rate of 1500 kW and discharges energy via heat transfer to the cold reservoir. a. The cycle develops power at a rate of 1000 kW. Use the Clausius inequality to determine whether this cycle operates reversibly, irreversibly, or is impossible. b. Do the same as in part a, but now...
A power cycle operates between hot and cold reservoirs at 600 K and 300 K, respectively. At steady state the cycle deve...
A power cycle operates between hot and cold reservoirs at 600 K and 300 K, respectively. At steady state the cycle develops a power output of 0.45 MW while receiving energy by heat transfer from the hot reservoir at the rate of 1 MW. (a) Determine the thermal efficiency and the rate at which energy is rejected by heat transfer to the cold reservoir, in MW. (b) Compare the results of part (a) with those of a reversible power cycle...
A power cycle operates between hot and cold reservoirs at 500 K and 310 K, respectively.
A power cycle operates between hot and cold reservoirs at 500 K and 310 K, respectively. At steady state, the cycle rejects energy by heat transfer to the cold reservoir at a rate of 16 MW. Determine the maxi- mum theoretical power that might be developed by such a cycle, in MW.
Operating in series are two reversible heat pumps. Heat transfer gives energy to the first cycle...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
5.43
A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and rejects energy QH to a hot reservoir at TH = 315 K, For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: QC = 1000 kJ, Wcycle = 80 kJ. QC = 1200 kJ. QH = 2000 kJ. QH = 1575 kJ. Wcycle = 200 kJ. beta = 6.
As shown in the figure, 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, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
(Clausius Inequality) A thermodynamic cycle operates at steady state between reservoirs at 1000 K and 500 K. The cycle receives energy via heat transfer at the high temperature at a rate of 1500 kW and discharges energy via heat transfer to the cold reservoir. a. The cycle develops power at a rate of 1000 kW. Use the Clausius inequality to determine whether this cycle operates reversibly, irreversibly, or is impossible. b. Do the same as in part a, but now...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
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