Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steamenters the turbine at 1600 lbf/in.2 and 950°F and expands to 400 lbf/in.?, where part of the steam is extracted and diverted into theclosed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 400 lbf/in.2 is trapped into the openfeedwater heater operating at 140 lbf/in.2The feedwater leaves the closed feedwater heater at 1600 lbf/in.? and a temperature equal to the saturation temperature at 400Ibf/in.2 The remaining steam expands through the second-stage turbine to 140 lbf/in.?, where some of the steam is extracted anddiverted to the open feedwater heater. Saturated liquid exits the open feedwater heater at 140 lbf/in.?The remaining steam expands through the third-stage turbine to the condenser pressure of 1.5 lbf/in.? The turbine stages operateadiabatically with isentropic efficiencies of 88%, and the pumps each operate adiabatically with isentropic efficiencies of 82%. Flowthrough the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. The net poweroutput 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 stage.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 Ibm/h.e) the rate of heat transfer, in Btu/lbm, to the working fluid passing through the steam generator.f) the thermal efficiency.

Since you have posted a question with multiple sub-parts, we will solve first three sub parts for…

Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine stage. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio.

Determine for the cycle: a) the mass fraction of steam diverted to the closed heater after the first turbine stage. b) the mass fraction of steam diverted to the open heater after the second turbine stage. c) the back work ratio.

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

See similar textbooks

Similar questions

1.10Water 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 lbf/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.2The remaining steam expands through the third-stage turbine to the condenser pressure of 3.5…
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 1150°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 expands through the second-stage turbine to 120 lbf/in.2, where 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.2The remaining steam expands through the third-stage turbine to the condenser pressure of 5 lbf/in.2 The turbine stages and the pumps each…
Water is the working fluid in an ideal regenerative Rankine cycle with one open feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.2 The remaining steam expands through the second-stage turbine to the condenser pressure of 6 lbf/in.2 Saturated liquid exits the open feedwater heater at 120 lbf/in.2 The net power output of the cycle is 1 x 108 Btu/h.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 heat transfer, in Btu/h, to the working fluid passing through the steam generator.(c) the percent thermal efficiency.
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 lbf/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.2The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.2…
Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. The remaining steam expands through the second-stage turbine to the condenser pressure of 5 lbf/in.2 Each turbine stage and the pump have isentropic efficiencies of 80%. Flow through the condenser, closed feedwater heater, and steam generator is at constant pressure. Condensate exiting the feedwater heater as saturated liquid at 120 lbf/in.2 undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400 lbf/in.2 and a temperature equal to the saturation temperature at 120 lbf/in.2 The net power output of the cycle is 1 x 109 Btu/h.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 heat transfer, in Btu/h, to…
Consider a regenerative vapor power cycle with one open feedwater heater. Steam enters the turbine at 8.0 MPa, 480oC and expands to 0.7 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 0.7 MPa. The remaining steam expands through the second-stage turbine to the condenser pressure of 0.008 MPa. Saturated liquid exits the open feedwater heater at 0.7 MPa. The isentropic efficiency of each turbine stage is 85% and each pump operates isentropically. If the net power output of the cycle is 100 MW, determine (a) the thermal efficiency and (b) the mass flow rate of steam entering the first turbine stage, in kg/h.
In a cogeneration system, a Rankine cycle operates with steam entering the turbine at 800 lbf/in.2, 700°F, and a condenser pressure of 180 lbf/in.2 The isentropic turbine efficiency is 80%. Energy rejected by the condensing steam is transferred to a separate process stream of water entering at 250°F, 140 lbf/in.2 and exiting as saturated vapor at 140 lbf/in.2 The mass flow rate of the process stream is 50,000 lb/h. Let T0 = 70°F, p0 = 14.7 lbf/in.2
Water is the working fluid in an ideal regenerative Rankine cycle with one open feedwater heater. Superheated vapor enters the first-stage turbine at 16 MPa, 560°C, and the condenser pressure is 8 kPa. The mass flow rate of steam entering the first-stage turbine is 310 kg/s. Steam expands through the first-stage turbine to 1 MPa where some of the steam is extracted and diverted to an open feedwater heater operating at 1 MPa. The remainder expands through the second-stage turbine to the condenser pressure of 8 kPa. Saturated liquid exits the feedwater heater at 1 MPa. Determine:(a) the net power developed, in kW.(b) the rate of heat transfer to the steam passing through the boiler, in kW.(c) the percent thermal efficiency.(d) the mass flow rate of condenser cooling water, in kg/s, if the cooling water undergoes a temperature increase of 18°C with negligible pressure change in passing through the condenser.
Water is the working fluid in a regenerative Rankine cycle with one open feedwater heater.Steam enters the first-stage turbine at 100 bar, 560°C and expands to the pressure of 15bar, where some of the steam is extracted and diverted to the feedwater heater operatingat the same pressure and the remainder expands through the second-stage turbine to thecondenser pressure of 0.1 bar. Saturated liquid exits the condenser at 0.1 bar and thefeedwater heater at 15 bar. The isentropic turbine efficiency of the first-stage is 95% andthe second-stage is 85%. The isentropic pump efficiency of the first pump is 90%, and thesecond pump acts ideally. The net power developed is 210 MW.Questions:Determine:(a) the mass flow rate of the steam extracted and diverted to the feedwater heater, inkg/s(b) the rate of heat transfer rejected from the condenser, in MW
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, and reheat. Steam enters the first turbine stage at 12 MPa, 560°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the closed feedwater heater. The remainder is reheated at 2 MPa to 520°C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open feedwater heater operating at 0.3 MPa.The steam expanding through the third-stage turbine exits at the condenser pressure of 60 kPa. Feedwater leaves the closed heater at 210°C, 12 MPa, and condensate exiting as saturated liquid at 2 MPa is trapped into the open feedwater heater. Saturated liquid at 0.3 MPa leaves the open feedwater heater. Each turbine stage and the pumps have an isentropic efficiency of 80%.Determine for the cycle:(a) the heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the first-stage…
An ideal Rankine cycle operates between the pressure limits of 15,000 kPa in the boiler and 15 kPa in the condenser. If the turbine inlet temperature is 500 deg C and the cycle produces 2500 kW of net work, determine the mass flow rate of the steam in kg/s. Refer to the tables below. a. 1.993 b. 2.122 c. 1.856 d. 2.016
Question 4 a) A power plant based on the ideal Rankine cycle has a net power output of 10 MW.Superheated steam enters the turbine at 10 MPa, 500 C. The condenser pressure is 15 kPa.Determine:i) the mass flow rate of the steam.ii) the rate of heat input to the cycle.iii) the thermal efficiency.