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 1000°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 Ibf/in.² The remaining steam is reheated to 900°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 5 x 108 Btu/h. Let To = 60°F. po = 14.7 lbf/in. The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-³R) 1 1.609 2 3 4 5 6 7 8 9 10 11 1493 1375 1375 1466 1315 1049 94.12 94.54 312.5 317.5 449.6 12 449.6 13 449.6 1.627 1.627 1.698 1.725 1.805 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.
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 1000°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 Ibf/in.² The remaining steam is reheated to 900°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 5 x 108 Btu/h. Let To = 60°F. po = 14.7 lbf/in. The table below provides steady-state operating data for the cycle. State h (Btu/lb) s (Btu/lb-³R) 1 1.609 2 3 4 5 6 7 8 9 10 11 1493 1375 1375 1466 1315 1049 94.12 94.54 312.5 317.5 449.6 12 449.6 13 449.6 1.627 1.627 1.698 1.725 1.805 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.
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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Y3a please help me with the solution and answer thank you
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 1000°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
Ibf/in.² The remaining steam is reheated to 900°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 5 x 108 Btu/h. Let To =
60°F. po = 14.7 lbf/in. The table below provides steady-state operating data for the cycle.
State h (Btu/lb) s (Btu/lb-R)
1
1.609
2
3
4
5
6
7
8
9
10
11
12
13
1493
1375
1375
1466
1315
1049
94.12
94.54
312.5
317.5
449.6
449.6
449.6
1.627
1.627
1.698
1.725
1.805
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.
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