7.58 Figure PZ.58 shows a gas turbine power plant using air as the working fluid. The accompanying table gives steady-stateoperating data. Air can be modeled as an ideal gas. Stray heat transfer and the effects of motion and gravity can be ignoredLet To 290 K, po = 100 kPa. Determine, each in kJ per kg of air flowing, (a) the net power developed, (b) the net exergyincrease of the air passing through the heat exchanger, (eg- e), and (c) a full exergy accounting based on the exergysupplied to the plant found in part (b). Comment.State p(kPa) T(K) h(kJ/kg) s° (kJ/kg K)1100 290 290.161.6680500 505 508.1722.22973 500 875 904.992.81704 100 635 643.932.4688a o is the variable appearing in Eq. 6.20a and Table A-22.Heat exchangerCompressorTurbineFIGURE P7.58

(a) Since at the power plant both turbine and compressor are involved, write the expression for the…

Answered: 7.58 Figure PZ.58 shows a gas turbine…

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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Steady-state operating data are shown in the figure for an open feedwater heater.Heat transfer from the feedwater heater to its surroundings occurs at an average outer surfacetemperature of 50°C at a rate of 100 kW. Ignore the effects of motion and gravity and let T 0 =25°C, p0 = 1 bar. Determine(a) the ratio of the incoming mass flow rates, ?̇# /?̇ $ .(b) the rate of exergy destruction, in kW.
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. (a) If TH = 1600 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 η = 70% and TC = 40°F, what is TH, in °F?(d) If η = 40% and TH = 1027°C, what is TC, in °C?
A steam turbine operates with an inlet condition of 30 bars, 400 °C, 160 m/s and an outlet state of a saturated vapour at 0.7 bar with a velocity of 100 m/s. The mass flow rate is 1200 kg/min, and the power output is 10,800 kW. Determine the magnitude and direction of the heat transfer rate, in kJ/min, if the potential energy change is negligible.
2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%
An industrial process discharges 75.3 kg/s of gaseous combustion products at 204°C, 100 kPa (properties at state 1). As shown in the figure, a proposed system for utilizing the combustion products combines a heat-recovery steam generator with a well-insulated turbine. At steady state, combustion products exit the steam generator at 130°C, 100 kPa, and a separate stream of water enters at 350 kPa, 46°C with a mass flow rate of 150 kg/min. At the exit of the turbine, the pressure is 7.5 kPa and the quality is 88%. Heat is lost from the steam generator at a rate of 93600 kJ/h. The changes in kinetic and potential energies of the flowing streams can be ignored as can the pressure drop for the water flowing through the steam generator. The combustion products can be modeled as air acting as an ideal gas with constant specific heats of Cv= 0.718 kJ/kg-K and Cp=1.005 kJ/kg-K. Use Rair = 0.287 kJ/kg-K. Also, for the compressed liquid, assume the substance is a saturated liquid at the given…
Use the following conversions where necessary:1hp = 745.7W; ρwater = 1000 kg/m3; ρmercury = 13600 kg/m3; 1 atm = 101.325 kPa; Cp (water) = 4.18 kJ/kg °C; g = 9.81m/s2; For properties of air, use R = 0.287 kJ/kg K; Cv (air) = 0.718 kJ/kg K; Cp (air) =1.005 kJ/kg K Steam at 80 bar, 440 °C, enters a turbine operating at steady state with a volumetric flow rate of 236 m3/min. Twenty percent of the entering mass flow exits through a diameter of 0.25 m at 60 bar, 400 °C. The rest exits through a diameter of 1.5 m with a pressure of 0.7 bar and a quality of 90 %. Determine the velocity at each exit duct, in m/s.
Thermodynamics A Rankine Engine-Generator unit receives 27,000 kg/hr of steam at 12 bar and 305 C and exhausts to a condenser temperature of 22 C. Brake steam rate is 4.74 kg/kW-hr, mechanical efficiency is 90 % and generator efficiency is 94 %. Determine: b) indicated engine efficiency, c) generator output (kW), d) quality of actual exhaust.
Figure shows a simple vapor power plant operating at steady state with water as the working fluid. Data at key locations are given on the figure. The mass flow rate of the water circulating through the components is 109 kg/s. Stray heat transfer and kinetic and potential energy effects can be ignored. Determine: (a) the mass flow rate of the cooling water, in kg/s. (b) the thermal efficiency. (c) the rates of entropy production, each in kW/K, for the turbine, condenser, and pump. (d) Using the results of part (c), place the components in rank order, beginning with the component contributing most to inefficient operation of the overall system. verl
At steady state, an electric pump motor develops power along its output shaft of 0.7 hp whiledrawing 6 amps at 100 V. The outer surface of the motor is at 150°F. Let T = 40°F.Determine:(b) the exergy flow with input power, exergy flow with output power, magnitude of exergy flowwith heat transfer leaving the motor, and exergy destruction, all in Btu/h.
Air enters a diffuser operating at steady state at 750°R, 15 lbf/in.2, with a velocity of 600 ft/s, and exits with a velocity of 60 ft/s. The ratio of the exit area to the inlet area is 8. Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in.2, at the exit.
Air enters a diffuser operating at steady state at 540°R, 15 lbf/in.2, with a velocity of 600 ft/s, and exits with a velocity of 60 ft/s. The ratio of the exit area to the inlet area is 6.Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in.2, at the exit.
As shown in the figure below, two reversible cycles arranged in series each produce the same net work, Wcycle. The first cycle receives energy QH by heat transfer from a hot reservoir at TH = 1500°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 T and rejects energy QC by heat transfer to a reservoir at TC = 450°R. All energy transfers are positive in the directions of the arrows. 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 1500°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.

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