Compare the thermal efficiency of a steam power plant operating on the ideal Rankine cycle witha reheat stage to another scenario where the reheat stage is replaced by an open feedwater heater.A. In the first scenario, steam enters the high-pressure turbine at 15 MPa and 600°C, thenmoves to the reheater at 4 MPa, where it is reheated to 600°C, and finally expands to 10kPa in the condenser.B. In the second scenario, some steam leaves the turbine at a pressure of 1.2 MPa and entersthe open feedwater heater. The steam then continues to expand to 10 kPa in thecondenser.Calculate and compare the thermal efficiencies of both cycles."

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Answered: Compare the thermal efficiency of a…

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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a. Calculate the thermal efficiency and turbine-exit quality for an Ideal Rankine Cycle where the steam exits boiler at 5MPa, 450C and the condenser pressure is 15 kPa. Draw the systems and the Ts diagram for the process. b. Calculate also the thermal efficiency and turbine-exit quality if the system is modified to an Ideal Reheat Rankine Cycle where the reheat takes place at 1 MPa and the steam leaves the reheater at 500C. Draw the systems and the Ts diagram for the process and discuss your findings of these two systems.
1. Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of45 MW. Steam enters the turbine at 7 MPa and 500°C and iscooled in the condenser at a pressure of 10 kPa by runningcooling water from a lake through the tubes of the condenserat a rate of 2000 kg/s. Show the cycle on a T-s diagram withrespect to saturation lines, and determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and(c) the temperature rise of the cooling water. Answers:(a) 38.9 percent, (b) 36 kg/s, (c) 8.4°C 2. Consider a 210-MW steam power plant that operateson a simple ideal Rankine cycle. Steam enters the turbine at10 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa. Show the cycle on a T-s diagram with respectto saturation lines, and determine (a) the quality of the steamat the turbine exit, (b) the thermal efficiency of the cycle,and (c) the mass flow rate of the steam. Answers: (a) 0.793,(b) 40.2 percent, (c) 165…
An ideal RANKINE cycle delivers 210 MW of power. Steam enters the turbine at 10 MPa and500C and is cooled in a condenser at 10 kPaa. Determine the thermal efficiency of this cycleb. Mass flow of waterc. Heat rejected in the condenserd. Work inputted to the pump (remember the volume is constant)
3.) A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa where some steam is extracted for feedwater heating while the rest is reheated to the same temperature. After expanding again, it enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kJ kj kJ kJ kJ kg 1715.88- 20.01%, 2667.84- 955.97 3.74 951.96 35.68%, 3.78. " J kg kg kg kg kWh kg "
A Rankine cycle using superheat and reheat applications. Steam enters the stage 1 turbine at 8 MPa and a temperature of 480°C and expands at a pressure of 0.7 MPa. The steam is then reheated to a temperature of 440°C before entering the stage 2 turbine, where the steam expands in the condenser at a pressure of 0.008 MPa. The net power generated is 100 MW. Calculate : A) the thermal efficiency of the cycle, B) the mass flow rate of the steam, C) the rate of heat transferred from the condenser to the surroundings (Qout)
3. A simple ideal Rankine cycle which uses water as the working fluid operates its condenser at 40 °C and its boiler at 300 °C. Calculate the work produced by the turbine, the heat supplied in the boiler, and the thermal efficiency of this cycle when the steam enters the turbine without any superheating. Wpump.in Pump 0-1 9in Boiler 13 qout Turbine Condenser Wturb,out 4
A steam power plant operating on a simple ideal Rankine cycle maintains the boiler at 6000 kPa, turbine inlet at 600°C, and condenser at 50 kPa. Calculate and Compare the thermal efficiency of this cycle when a) It is operated in such a way that the liquid enters the pump as saturated liquid at the pressure of the pump. condenser. b) It is operated in such a way that the liquid enters the pump 11.3 °C colder than a saturated liquid. at condenser pressure. c) Plot the process from a) on a T-s diagram.
2.) A steam power plant uses the ideal Regenerative Rankine cycle with single open feedwater heater where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa then some steam is extracted at this point. The remaining steam expands and enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kJ kg 20.01%, 2286.801457.51,832.54 3.34,829.2936.26%, 4.34. ) kg kWh
SITUATIONAL PROBLEM NO II In a reheat cycle steam at 8.0MPA and 485degC enters the turbine and expands to 1.4MPA. At this point, the steam is withdrawn and passed through a reheater. It reenters the turbine at 1.3 MPa and 720degC. Expansion now occurs to the condenser pressure of 0.0006MPa. For the cycle and 1kg of steam determine: 4. Heat added 5. Work Turbine 6. Work Net Thermal Efficiency 7.
The net work for a given reheat Rankine cycle is 80MW. Steam at 10 MPa and 500C enters the first turbine and then, the second turbine at 1.2 MPa and 500C. Saturated liquid exits the condenser at 20 kPa. Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the pump outlet, point 3 at the boiler outlet, point 4 at the reheater inlet, point 5 at the reheater outlet, and point 6 at the condenser inlet. Use 2 decimal places for the enthalpy and other energies in solving and for the final answers. For the steam quality (x) and entropy (s), use 4 decimal places in solving. For the specific volume, use 6 decimal places. IMPORTANT: USE THE STEAM TABLES FROM CENGEL'S BOOK ONLY (uploaded already in the files section). Determine the following: Enthalpy at point 2 in kJ/kg = Enthalpy at point 4 in kJ/kg = Enthalpy at point 5 in kJ/kg = Enthalpy at point 6 in kJ/kg = Thermal Efficiency in % = Heat added in kJ/kg = Heat rejected in…
In a Rankine cycle, steam leaves the boiler and enters the turbine at 4 MPa and 400◦C. The condenser pressure is 10 kPa. Determine the cycle efficienc
Find the net work.

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