As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejectsenergy Qc by heat transfer to a cold reservoir at Tc.Hot reservoirat THBoundary-RWacycleCold reservoir2cat 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?

Answers: η = 63.63 % QH = 1610 kJ , QC = 610 kJ TH = 789.08°F TC = 327°C

Answered: As shown in the figure below, a…

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

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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 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

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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.