4-2 A steam cycle power system operates on a Rankine cycle with a closed feedwater heater. The turbine efficiency is 93% and the condensate (out of the condenser) is 2°C subcooled. [2 degrees subcooled means 2 degrees below saturation temperature.] Steam enters the turbine at 470°C and 5.0 MPa and exhausts at 20 kPa to the condenser. Steam is extracted at 1000 kPa for the closed feedwater heater and is returned to the condenser after being throttled to the condenser pressure. Assume that the water leaving the closed feedwater heater at 7 has a quality of 10%. The temperature at 3 is the same as the temperature at 7 (Ty T7.) The pump is NOT isentropic! Determine the (a) extraction y as a fraction of total steam flow rate, (b) work produced by the turbine (in kJ/kg), (c) work done by the pump (in kJ/kg). (d) the heat added by the boiler per unit cycle (in kJ/kg) and (e) the thermal efficiency. Turbine MPa Boiler I MPa y S5 Condenser 1-y 20 kPa Closed fwh Jout 6s 6. Pump

4-2 A steam cycle power system operates on a Rankine cycle with a closed feedwater heater. The turbine efficiency is 93% and the condensate (out of the condenser) is 2°C subcooled. [2 degrees subcooled means 2 degrees below saturation temperature.] Steam enters the turbine at 470°C and 5.0 MPa and exhausts at 20 kPa to the condenser. Steam is extracted at 1000 kPa for the closed feedwater heater and is returned to the condenser after being throttled to the condenser pressure. Assume that the water leaving the closed feedwater heater at 7 has a quality of 10%. The temperature at 3 is the same as the temperature at 7 (Ty T7.) The pump is NOT isentropic! Determine the (a) extraction y as a fraction of total steam flow rate, (b) work produced by the turbine (in kJ/kg), (c) work done by the pump (in kJ/kg). (d) the heat added by the boiler per unit cycle (in kJ/kg) and (e) the thermal efficiency. Turbine MPa Boiler I MPa y S5 Condenser 1-y 20 kPa Closed fwh Jout 6s 6. Pump

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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