10–62E A steam power plant operates on an ideal reheat-regenerative Rankine cycle with one reheater and two open feedwaterheaters. Steam enters the high-pressure turbine at 1500 psia and 1100°F and leaves the low-pressure turbine at 1 psia. Steam isextracted from the turbine at 250 and 40 psia, and it is reheated to 1000°F at a pressure of 140 psia. Water leaves both feedwaterheaters as a saturated liquid. Heat is transferred to the steam in the boiler at a rate of 4 x 10 Btu/s. Show the cycle on a T-sdiagram with respect to saturation lines, and determine (a) the mass flow rate of steam through the boiler, (b) the net poweroutput of the plant, and (c) the thermal efficiency of the cycle.High-PturbineLow-PturbineBoilerReheater1-y-z12ОрсnОpenFWHFWHIICondenserPump IIIPump IIPump I

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Answered: 10–62E A steam power plant operates on…

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 steam power plant operating on a simple ideal Rankine cycle maintains the boiler at 6000 kPa, the turbine inlet at 600C, and the condenser at 50 kPa. Compare the thermal efficiency of this cycle when it is operated so that the liquid enters the pump as a saturated liquid against that when the liquid enters the pump 11.3C cooler than a saturated liquid at the condenser pressure.
An ideal reheat Rankine cycle with water as the working fluid operates the inlet of the high-pressure turbine at 7000 kPa and 450°C, the inlet of the low-pressure turbine at 500 kPa and 500°C, and the condenser at 10 kPa. Determine the mass flow rate through the boiler needed for this system to produce a net 5000 kW of power and the thermal efficiency of the cycle. Use steam tables. kg/s. The mass flow rate through the boiler needed for this system to produce a net 5000 kW of power is The thermal efficiency is %.
10-60 A steam power plant operates on an ideal reheat-regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at this pressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to 500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Answers: (a) 54.5 kg/s, (b) 44.4 percent
A steam power plant operates on an ideal regenerative Rankine cycle with two open feedwater heaters. Steam enters the turbine at 8 MPa and 550C and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.6 and 0.2 MPa. Water leaves both feedwater heaters as a saturated liquid. The mass flow rate of steam through the boiler is 16 kg/s. Show the cycle on a T-s diagram, and determine (a) the net power output of the power plant and (b) the thermal efficiency of the cycle.
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A steam power plant operates on an ideal regenerative Rankine cycle with two open feedwater heaters. Steam enters the turbine at 7 MPa and 500c and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.7 and 0.3 MPa. Water leaves both feedwater heaters as a satu rated liquid. The mass flow rate of steam through the boiler is 14 kg/s. Show the cycle on a T-s diagram, and determine (a) the net power output of the power plant and (b) the thermal efficiency of the cycle
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A steam power plant operates on an ideal reheat–regenerative Rankine cycle with onereheater and two feedwater heaters, one open and one closed. Steam enters the highpressure turbine at 15 MPa and 600°C and the low pressure turbine at 1 MPa and 500°C.The condenser pressure is 5 kPa. Steam is extracted from the turbine at 0.6 MPa for theclosed feedwater heater and at 0.2 MPa for the open feedwater heater. In the closedfeedwater heater, the feedwater is heated to the condensation temperature of the extractedsteam. The extracted steam leaves the closed feedwater heater as a saturated liquid, whichis subsequently throttled to the open feedwater heater. Show the cycle on a T-s diagramwith respect to saturation lines. Determine (a) the fraction of steam extracted from theturbine for the open feedwater heater, (b) the thermal efficiency of the cycle, and (c) thenet power output for a mass flow rate of 42 kg/s through the boiler.
A steam power plant operates on an ideal reheat-regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 550c and leaves at 0.8 MPa. Some steam is extracted at this pressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to 500c and is expanded in the low- pressure turbine to the condenser pressure of 10 kPa. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle.
An ideal Rankine cycle with one stage of reheat utilizes steam as working medium. Boiler pressure is 4 MPa, the boiler exit temperature is 400°C, and the condenser pressure is 10 kPa. The reheat takes place at 0.4 MPa and the steam leaves the reheater at 400°C. (Enthalpies are in KJ/kg.). Determine the thermal efficiency of the cycle. Determine also the thermal efficiency if there is no reheater. The quality at the exhaust of the low pressure turbine is: Select one: O a. 13% O b. 97% O c. 3% O d. 87%
An ideal Rankine cycle with one stage of reheat utilizes steam as working medium. Boiler pressure is 4 MPa, the boiler exit temperature is 400°C, and the condenser pressure is 10 kPa. The reheat takes place at 0.4 MPa and the steam leaves the reheater at 400°C. (Enthalpies are in KJ/kg.). Determine the thermal efficiency of the cycle. Determine also the thermal efficiency if there is no reheater. The thermal efficiency is: Select one: O a. 35.60% O b. 36.73% O c. 37.50% O d. 33.75%
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 500°C and the low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. The isentropic efficiency of the turbine is 72 percent and that of the pump is 95 percent. d Determine the mass flow rate of the steam. The mass flow rate of the steam is 61.62 x kg/s.

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