As shown in the figure, a reversible power cycle R and an irreversible power cycle I operate between the same hot and cold thermal reservoir. Cycle I has a thermal efficiency equal to , one-third of the thermal efficiency of cycle R. (b) If each cycle develops the same net work, determine which cycle (i) receives greater energy by heat transfer from the hot reservoir, (ii) discharges greater energy by heat transfer to the cold reservoir. W₁ Он R Hot reservoir Qc=QH-WR m lc=QH-W₁ Cold reservoir W₁

As shown in the figure, a reversible power cycle R and an irreversible power cycle I operate between the same hot and cold thermal reservoir. Cycle I has a thermal efficiency equal to , one-third of the thermal efficiency of cycle R. (b) If each cycle develops the same net work, determine which cycle (i) receives greater energy by heat transfer from the hot reservoir, (ii) discharges greater energy by heat transfer to the cold reservoir. W₁ Он R Hot reservoir Qc=QH-WR m lc=QH-W₁ Cold reservoir W₁

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

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 system executes a power cycle while receiving 1000 Btu by heat transfer at a temperature of 900oR and discharging 600 Btu by heat transfer at a temperature of 540oR. There are no other heat transfers.Determine the cycle thermal efficiency. Use the Clausius Inequality to determine σcycle, in Btu/oR. Determine if this cycle is internally reversible, irreversible, or impossible.
Chapter 5 no. 4
Geothermal power plants use underground sources of hot water or steam to produce electricity. If a plant receives hot water at 350 F and rejects energy by heat transfer to the atmosphere at 60 F, what is the maximum possible efficiency for the power cycle? 64% 100% 83% 17% O 36%
A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Water at 1.0 bar and 20°C (state 1) enters the adiabatic pump and leaves at 10 bar (state 2). The pump draws 110 kW of power, and the mass flow rate of water is 45 kg/s. The water leaving the pump enters a heat exchanger and heated at constant pressure to 400°C (state 3) using exhaust gases (Cp of gases = 1.1 kJ/kgK) that enters at 500°C and exits at 182°C. The steam is adiabatically expanded in a turbine having an isentropic efficiency of 0.71. The turbine exhausts (state 4) to the surroundings at 1.0 bar. What is thermal efficiency of this power production process? If the pump and turbine are reversible, would the efficiency of this system equal the maximum possible efficiency? (Answer Yes or NO and provide a short explanation.)
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
A heat engine An engine that converts power from heat operating at a steady-state receives energy by heat transfer at a rate of Qu 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 kVW, Wcycle = 360 kW, Qc = 288 kW (c) Wcycle = 714 kW, Qc = 306 kW (d) QH = 920 kW, Qc = 368 kW
The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is 40%. Evaluate the coefficient of performance of: (a) a reversible refrigeration cycle operating between the same two reservoirs. (b) a reversible heat pump cycle operating between the same two reservoirs.