A heat engine An engine that converts power from heat operating at a steady-state receives energy by heat transfer at a rate of QH at TH= 1200 K and rejects energy by heat transfer to a cold reservoir at a rate Qc at Tc= 360 K. (i) Calculate the Carnot cycle efficiency (ii) For each of the following cases, analyze and determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH= 720 kW, Qc = 144 kW (b) QH = 720 kW,Wcycle = 360 kW, Qc = 288 kW (c) Wcycle = 714 kW, Qc = 306 kW (d) QH = 920 kW, Qc = 368 kW

A heat engine An engine that converts power from heat operating at a steady-state receives energy by heat transfer at a rate of QH at TH= 1200 K and rejects energy by heat transfer to a cold reservoir at a rate Qc at Tc= 360 K. (i) Calculate the Carnot cycle efficiency (ii) For each of the following cases, analyze and determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH= 720 kW, Qc = 144 kW (b) QH = 720 kW,Wcycle = 360 kW, Qc = 288 kW (c) Wcycle = 714 kW, Qc = 306 kW (d) QH = 920 kW, Qc = 368 kW

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

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- 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 = 1800 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 = 1027°C, what is Tc, in °C?
A reversible power cycle whose thermal efficiency is 50% operates between a reservoir at 1800 K and a reservoir at a lower temperature T. Determine T, in K.
A closed system undergoes a cycle consisting of three process 1-2, 2-3 and 3-1. Given that Q12 = 30kJ, Q23 = 10 kJ, 1w2 = 5 kJ, 3w2 = 5 kJ and DE31 = 15 kJ, Evaluate Q31, w23, DE12 and DE23.
8Q Prove that, whenever a system undergoes a cycle, p<0 (b) T.
Water stored in a large, well-insulated storage tank at 21oC, and atmospheric pressure is being pumped at steady state from this tank by a pump at the rate of 40m3/h. The motor driving the pump supplies energy at the rate of 8.5 k.W. The water is used as a cooling medium and passes through a heat exchanger where 255 k.W of heat is added to the water. The heated water then flows to a second large, vented tank, which is 25 m above the first tank. Determine the final temperature of the water delivered to the second tank.
A reversible power cycle whose thermal efficiency is 37% receives 50 kJ by heat transfer from a hot reservoir at 300°C and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected, in KJ, and Tc, in °C. Determine the entropy production for the cycle, Ocycle, in kJ/K.
A reversible power cycle whose thermal efficiency is 43% receives 50 kJ by heat transfer from a hot reservoir at 310°C and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected, in kJ, and Tc, in °C. Determine the entropy production for the cycle, cycle, in kJ/K.
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
.......A gas turbine power plant is operated between 1.5 bar and 15 bar with minimum and maximum cycle temperatures of 25 C and 1420 C, respectively. Neglect the mass of the fuel. Determine the following: Work of the compressor in kJ/kg (2 decimal places) = Work of the gas turbine in kJ/kg (2 decimal places) = Heat added in the combustion chamber in kJ/kg (2 decimal places) = Net Work in kJ/kg (2 decimal places) = Thermal Efficiency in % (1 decimal place only) =
Consider a refrigerator and a heat pump working on the reversed Carnot cycle between the same temperature limits. Which of the following is correct? (a) COP of refrigerator = COP of heat pump (b) COP of refrigerator = COP of heat pump + 1 c) COP of refrigerator = COP of heat pump -1 (d) COP of refrigerator = Inverse of the COP of heat pump %3D %3D %3D %3D
1. Consider the following heat engines operating between 1200K and 300 K. For each case determine whether the heat engine operates reversibly, operates irreversibly, or is impossible. a. QH = 850 kJ, Qc = 300 kJ, Wnet = 550 kJ, %3| b. QH = 900 kJ, Qc = 400 kJ, Wnet = 550 kJ, %3D c. QH = 700 kJ, Qc = 140 kJ, Wnet = 560 kJ, d. QH = 800 kJ, Qc = 200 kJ, Wnet = 600 kJ.