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Question 15 of 15 View Policies Current Attempt in Progress Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 950°F and expands to 400 lbf/in.2, where part of the steam is extracted and diverted into the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 400 lbf/in.2 is trapped into the open feedwater heater operating at 140 lbf/in.² The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 400 lbf/in.² The remaining steam expands through the second-stage turbine to 140 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater. Saturated liquid exits the open feedwater heater at 140 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 1.5 lbf/in.2 The turbine stages operate adiabatically with isentropic efficiencies of 88%, and the pumps each operate adiabatically with isentropic efficiencies of 82%. Flow through the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. The net power output of the cycle is 5 x 108 Btu/h. Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine: ge. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio. : d) the mass flow rate of steam entering the first stage of the turbine, in lbm/h. e) the rate of heat transfer, in Btu/lbm, to the working fluid passing through the steam generator. f) the thermal efficiency.

Question 15 of 15 View Policies Current Attempt in Progress Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 950°F and expands to 400 lbf/in.2, where part of the steam is extracted and diverted into the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 400 lbf/in.2 is trapped into the open feedwater heater operating at 140 lbf/in.² The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 400 lbf/in.² The remaining steam expands through the second-stage turbine to 140 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater. Saturated liquid exits the open feedwater heater at 140 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 1.5 lbf/in.2 The turbine stages operate adiabatically with isentropic efficiencies of 88%, and the pumps each operate adiabatically with isentropic efficiencies of 82%. Flow through the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. The net power output of the cycle is 5 x 108 Btu/h. Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine: ge. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio. : d) the mass flow rate of steam entering the first stage of the turbine, in lbm/h. e) the rate of heat transfer, in Btu/lbm, to the working fluid passing through the steam generator. f) the thermal efficiency.

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
Problem 1.1MA
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Question 15 of 15 View Policies Current Attempt in Progress Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 950°F and expands to 400 lbf/in.2, where part of the steam is extracted and diverted into the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 400 lbf/in.2 is trapped into the open feedwater heater operating at 140 lbf/in.² The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 400 lbf/in.² The remaining steam expands through the second-stage turbine to 140 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater. Saturated liquid exits the open feedwater heater at 140 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 1.5 lbf/in.2 The turbine stages operate adiabatically with isentropic efficiencies of 88%, and the pumps each operate adiabatically with isentropic efficiencies of 82%. Flow through the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. The net power output of the cycle is 5 x 108 Btu/h. Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine: ge. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio. : d) the mass flow rate of steam entering the first stage of the turbine, in lbm/h. e) the rate of heat transfer, in Btu/lbm, to the working fluid passing through the steam generator. f) the thermal efficiency.
Transcribed Image Text:Question 15 of 15 View Policies Current Attempt in Progress Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 950°F and expands to 400 lbf/in.2, where part of the steam is extracted and diverted into the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 400 lbf/in.2 is trapped into the open feedwater heater operating at 140 lbf/in.² The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 400 lbf/in.² The remaining steam expands through the second-stage turbine to 140 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater. Saturated liquid exits the open feedwater heater at 140 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 1.5 lbf/in.2 The turbine stages operate adiabatically with isentropic efficiencies of 88%, and the pumps each operate adiabatically with isentropic efficiencies of 82%. Flow through the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. The net power output of the cycle is 5 x 108 Btu/h. Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine: ge. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio. : d) the mass flow rate of steam entering the first stage of the turbine, in lbm/h. e) the rate of heat transfer, in Btu/lbm, to the working fluid passing through the steam generator. f) the thermal efficiency.
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