Problem 3. A vapor power plant produces 25 kg/s steam at 6 MPa, 500°C, in the boiler. It cools the condenser to an exit of 40°C, and the cycle is shown in the figure. An extraction is done at 800 kPa to an open feedwater heater; in addition, a steam supply of 5 kg/s is taken out and not returned. The missing 5 kg/s water is added to the feedwater heater from a 20°C, 800 kPa source. Assuming the turbines and the pumps to be isentropic, find (a) the needed extraction flow rate to cover both the feedwater heater and the steam supply. (b) the total net power output, (c) the utilization factor of the power plant. 1 | T, %3D 40 С, х 3D0 2 P2 = 800 kPa Boiler T1 E T2 P2 Water resupply FWH 5 P5 = 6 MPa, T, = 500 C 6 P2 = 800 kPa %3D Steam supply %3| 3 X3 = 0 4 PA = 6 MPa 7 P1 Condenser 8 Pg = 800 kPa,T3 = 20 C %3D

Problem 3. A vapor power plant produces 25 kg/s steam at 6 MPa, 500°C, in the boiler. It cools the condenser to an exit of 40°C, and the cycle is shown in the figure. An extraction is done at 800 kPa to an open feedwater heater; in addition, a steam supply of 5 kg/s is taken out and not returned. The missing 5 kg/s water is added to the feedwater heater from a 20°C, 800 kPa source. Assuming the turbines and the pumps to be isentropic, find (a) the needed extraction flow rate to cover both the feedwater heater and the steam supply. (b) the total net power output, (c) the utilization factor of the power plant. 1 | T, %3D 40 С, х 3D0 2 P2 = 800 kPa Boiler T1 E T2 P2 Water resupply FWH 5 P5 = 6 MPa, T, = 500 C 6 P2 = 800 kPa %3D Steam supply %3| 3 X3 = 0 4 PA = 6 MPa 7 P1 Condenser 8 Pg = 800 kPa,T3 = 20 C %3D

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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