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

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 19RQ: Two methods used to power refrigeration compressors on a ship are _____and ____.

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