Elements Of Electromagnetics

7th Edition

ISBN: 9780190698614

Author: Sadiku, Matthew N. O.

Publisher: Oxford University Press

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An adiabatic steam nozzle has steam entering at 500 kPa, 200°C, and 30 m/s, and leaving as a saturated vapor at 200 kPa. Calculate the second-law efficiency of the nozzle. Take T0 = 25°C

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Thermal dynamics
Steam enters a turbine at 20kg/s, 900 degrees C and 8MPa. 20% of the steam is left at pressure of 400kPa, and the remaining is left at the exhaust pressure of 50 kPa. If the isentropic efficiency of the turbine is 80%, determine the actual power generated by this turbine, and the temperature at both the intermediate port and exhaust port.

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Refrigerant R-134a enters a continuous flow adiabatic compressor as saturated steam at a speed of 2 kg/s at -14 OC and is compressed to 0.8 MPa and 70 oC. If the kinetic and potential energy exchange is neglected, what is the power consumed by the compressor?
a)110 kW
b)130 kW
c)78 kW
d)94 kW
(please can you help quickly)

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Water vapor enters a reversible-adiabatic (isentropic) turbine with 4 MPa pressure, 500C temperature and 60 m / s velocity and exits the turbine with 75kPa pressure and 140 m / s velocity. Since the flow rate of the steam entering the turbine is 1 kg / h, find the power of the turbine.

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Water enters a pump at 100 kPa and 30°C at a rate of 1.35 kg/s and leaves at 4 MPa. If the pump has an isentropic efficiency of 70 percent, determine the second-law efficiency for an environment temperature of 20°C.

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Refrigerant-134a is to be cooled by water in a condenser. The refrigerant enters the condenser with a mass flow rate of 6 kg/min at 1 MPa and 70oC and leaves at 35oC. The cooling water enters at 300 kPa and 15C and leaves at 25oC. Neglecting any pressure drops, determine ;
i. The mass flow rate of the cooling water required.ii. The heat transfer rate from the refrigerant to water.

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R-134a enters an adiabatic compressor as a saturated vapor at 120kpa at a rate of 0.5 m³/min and exits at 1.2Mpa pressure. If the isentropic efficiency of the compressor is 75 percent, determine:
a. The temperature at the exit. b. The power input..

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Refrigerant-134a is expanded adiabatically from 100 psia and 100°F to a pressure of 10 psia. Determine the entropy generation for this process, in Btu/lbm·R.

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An isentropic steam turbine processes 5.5 kg/s of steam at 3 MPa, which is exhausted at 50 kPa and 100°C. Five percent of this flow is diverted for feedwater heating at 500 kPa. Determine the power produced by this turbine. Use steam tables.

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Argon gas enters an adiabatic turbine at 1350°F and 200 psia at a rate of 40 lbm/min and exhausts at 20 psia. If the power output of the turbine is 105 hp, determine the isentropic efficiency.

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Steam enters an adiabatic turbine at 2.5MPa pressure and 450C, and at 60kPa pressure and 100C. comes out. If the power output of the turbine is 3MW, the mass flow and the isentropic efficiency of the turbine calculate.

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The power output of an adiabatic turbine is 6.1 MW. Steam at a rate of 7 kg/s enters the turbine at 7 MPa, 600°C, and 80 m/s and leaves at 50 kPa, 150°C, and 140 m/s. Determine the isentropic efficiency of the turbine.

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