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Water is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1100°F and expands to 500 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 lbf/in.² undergoes a throttling process to 120 lbf/in.² as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 500 lbf/in.² The remaining steam is reheated to 1000°F before entering the second-stage turbine, where it expands to 120 lbf/in.² Some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.² Saturated liquid exits the open feedwater heater at 120 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.² The turbine stages and the pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open feedwater heater, steam generator, and reheater is at constant pressure. The net power output of the cycle is 2 x 10 Btu/h. Let To = 60°F, po = 14.7 lbf/in.² The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-ºR) 1 1553 1.649 1.667 1.667 1.737 2 3 4 5 6 7 8 9 10 11 12 13 1424 1424 1521 1357 1074 94.12 94.54 312.5 317.5 449.6 449.6 449.6 1.764 1.849 0.1751 0.1758 0.4917 0.4979 0.6491 0.6491 0.663

Water is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1100°F and expands to 500 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 lbf/in.² undergoes a throttling process to 120 lbf/in.² as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 500 lbf/in.² The remaining steam is reheated to 1000°F before entering the second-stage turbine, where it expands to 120 lbf/in.² Some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.² Saturated liquid exits the open feedwater heater at 120 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.² The turbine stages and the pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open feedwater heater, steam generator, and reheater is at constant pressure. The net power output of the cycle is 2 x 10 Btu/h. Let To = 60°F, po = 14.7 lbf/in.² The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-ºR) 1 1553 1.649 1.667 1.667 1.737 2 3 4 5 6 7 8 9 10 11 12 13 1424 1424 1521 1357 1074 94.12 94.54 312.5 317.5 449.6 449.6 449.6 1.764 1.849 0.1751 0.1758 0.4917 0.4979 0.6491 0.6491 0.663

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Water is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1100°F and expands to 500 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 lbf/in.² undergoes a throttling process to 120 lbf/in.² as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 500 lbf/in.² The remaining steam is reheated to 1000°F before entering the second-stage turbine, where it expands to 120 lbf/in.² Some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.2 Saturated liquid exits the open feedwater heater at 120 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.² The turbine stages and the pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open feedwater heater, steam generator, and reheater is at constant pressure. The net power output of the cycle is 2 x 10⁹ Btu/h. Let To = 60°F, po = 14.7 lbf/in.2 The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-ºR) 1 2 3 4 5 6 7 8 9 10 11 12 13 1553 1424 1424 1521 1357 1074 94.12 94.54 312.5 317.5 449.6 449.6 449.6 1.649 1.667 1.667 1.737 1.764 1.849 0.1751 0.1758 0.4917 0.4979 0.6491 0.6491 0.663
Transcribed Image Text:Water is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1100°F and expands to 500 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 lbf/in.² undergoes a throttling process to 120 lbf/in.² as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 500 lbf/in.² The remaining steam is reheated to 1000°F before entering the second-stage turbine, where it expands to 120 lbf/in.² Some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.2 Saturated liquid exits the open feedwater heater at 120 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.² The turbine stages and the pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open feedwater heater, steam generator, and reheater is at constant pressure. The net power output of the cycle is 2 x 10⁹ Btu/h. Let To = 60°F, po = 14.7 lbf/in.2 The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-ºR) 1 2 3 4 5 6 7 8 9 10 11 12 13 1553 1424 1424 1521 1357 1074 94.12 94.54 312.5 317.5 449.6 449.6 449.6 1.649 1.667 1.667 1.737 1.764 1.849 0.1751 0.1758 0.4917 0.4979 0.6491 0.6491 0.663
Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of exergy input, in Btu/h, to the working fluid passing through the steam generator. (c) the magnitude of the exergy output, in Btu/h, of the net power output. (d) the magnitude of the exergy loss in the condenser, in Btu/h. e) the exergy destroyed in the tubine, in Btu/h. (f) the exergy destroyed in the open feedwater heater, in Btu/h.
Transcribed Image Text:Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of exergy input, in Btu/h, to the working fluid passing through the steam generator. (c) the magnitude of the exergy output, in Btu/h, of the net power output. (d) the magnitude of the exergy loss in the condenser, in Btu/h. e) the exergy destroyed in the tubine, in Btu/h. (f) the exergy destroyed in the open feedwater heater, in Btu/h.
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