QI A steam power plant that operates on a regenerative Rankine cycle and has a net power output of 175 MW. Steam enters the turbine at 12.5 MPa and 600°C and the condenser at 15 kPa. Steam is extracted from the turbine at 0.8 MPa to heat the feed water in an open feed water heater. Water leaves the feed water heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Fig. Q1 lembr O 3271 fo Tarbowe CONLLWAY

QI A steam power plant that operates on a regenerative Rankine cycle and has a net power output of 175 MW. Steam enters the turbine at 12.5 MPa and 600°C and the condenser at 15 kPa. Steam is extracted from the turbine at 0.8 MPa to heat the feed water in an open feed water heater. Water leaves the feed water heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Fig. Q1 lembr O 3271 fo Tarbowe CONLLWAY

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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Consider a steam power plant that operates on an ideal regenerative Rankine cycle and has a net power output of 150 MW. Steam enters the turbine at 10 MPa and 500°C and the condenser at 15 kPa. Steam is extracted from the turbine at 0.5 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the mass flow rate of steam through the boiler, and (b) the thermal efficiency of the cycle.
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 80%, and that of the pump is 95 %. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a)the quality (or temperature, if superheated) of the steam at the turbine exit, (b)the thermal efficiency of the cycle, and (c)the mass flow rate of the steam.
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.
An ideal reheat 210 MW Rankine cycle with water as the working fluid operates the boiler at 15 MPa, the reheater at 2 MPa, and the condenser at 10 kPa. The temperature is 500 0C at the entrance of the high-pressure and low-pressure turbines. Determine (a) the quality of the steam at the low-pressure turbine exit, (b) the thermal efficiency of this system, and (c) the rate of heat transfer in the reheater.
Consider a steam power plant that operates on the ideal regenerative Rankine cycle with a closed feedwater heater. The plant maintains the turbine inlet at 3000 kPa and 350 deg C; and operates the condenser at 10 kPa. Steam is extracted at 1000 kPa to serve the closed feedwater heater, which discharges into the condenser after being throttled to condenser pressure. The temperature of the feedwater entering the boiler is 210 deg C. a.)Calculate the work produced by the turbine in kJ/kg. b.)Calculate the work consumed by the pump in kJ/kg. c.)Calculate the heat supply in the boiler for this cycle per unit of boiler flow rate in kJ/kg. d.)Calculate the cycle thermal efficiency in %.
Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900F and leaves as saturated vapor. Steam is then reheated to 800F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6 * 104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45F. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the pressure at which reheating takes place, (b) the net power output and thermal efficiency, and (c) the minimum mass flow rate of the cooling water required.
Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of 45MW. Steam enters the turbine at 7 MPa and 500 ˚C and is cooled in the condenser at a pressure of 10kPa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. Show the schematic diagram of the power plant and draw the cycle on a T-s diagram with respect to saturation lines. Also, determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and (c) the rise in temperature of the cooling water. Repeat your calculations assuming an isentropic efficiency of 85 and 90 for the turbine and the pump, respectively.
A steam power plant operates on the Rankine cycle with reheat and has a net power of 120 MW. Steam enters the high pressure turbine at 9 MPa and 600 °C, and the low pressure turbine at 1 MPa and 600 °C; It leaves the condenser as a saturated liquid at a pressure of 10 kPa.a) Show the cycle in the T-s diagram including the saturated liquid and vapor curves.b) The degree of dryness of the steam at the turbine exit.c) The thermal efficiency of the cycled) Determine the mass flow rate of the steam.
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.
Consider a 150-MW steam power plant that operates on a simple Rankine cycle. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at 10 kPa. Calculate the plant monthly consumption of coal if its heating value is 26,450 kJ/kg and the boiler has an efficiency of 90%. Assume an isentropic efficiency of 87% for both the turbine and the pump.
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 500C and the low-pressure turbine at 1 MPa and 500C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. The isentropic efficiency of the turbine is 80 percent, and that of the pump is 95 percent. (a) Determine the quality (or temperature, if superheated) of the steam at the turbine exit, (b) Determine the thermal efficiency of the cycle, (c) Determine the mass flow rate of the steam, (d) Show the cycle on a T-s diagram with respect to the vapor dome and specifying T and s in all principal points of the cycle.
A steam power plant operates on the reheat-regenerative Rankine cycle with a closed feedwater heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed feedwater heater, and pumped to 12.5 MPa before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 percent for both the turbine and the pump, determine (a) the temperature of the steam at the inlet of the closed feedwater heater, (b) the mass flow rate of the steam extracted from the turbine for the closed feedwater heater, (c) the net power output, and (d) the thermal efficiency.