Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas turbine cycle is 11. Air enters the compressor at 300 K and the turbine at 1100 K. The combustion gases leaving the gas turbine are used to heat the steam at 5 MPa to 350°C in a heat exchanger. The combustion gases leave the heat exchanger at 420 K. An open feedwater heater incorporated with the steam cycle operates at a pressure of 0.8 MPa. The condenser pressure is 10 kPa. Assume isentropic efficiencies of 100 percent for the pump, 82 percent for the compressor, and 86 percent for the gas and steam turbines. Determine the thermal efficiency of the combined cycle. The thermal efficiency of the combined cycle is %.

Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas turbine cycle is 11. Air enters the compressor at 300 K and the turbine at 1100 K. The combustion gases leaving the gas turbine are used to heat the steam at 5 MPa to 350°C in a heat exchanger. The combustion gases leave the heat exchanger at 420 K. An open feedwater heater incorporated with the steam cycle operates at a pressure of 0.8 MPa. The condenser pressure is 10 kPa. Assume isentropic efficiencies of 100 percent for the pump, 82 percent for the compressor, and 86 percent for the gas and steam turbines. Determine the thermal efficiency of the combined cycle. The thermal efficiency of the combined cycle is %.

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

Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine: the quality of the steam at the turbine exit the thermal efficiency of the cycle specific enthalpy (kJ/kg) at the condenser both inlet and outlet specific enthalpy (kJ/kg) at the boiler both inlet and outlet WT, WP, WNet(kJ/kg) actual Qin (kJ/kg) and actual Qout (kJ/kg).
A coal-fired power plant is planned to be set up , aiming to produce a net power output of 60 MW. The power plant will operate on a reheat Rankine cycle. The steam enters the high-pressure turbine at a pressure of 7 MPa and a temperature of 400°C, while it enters the low-pressure turbine at a pressure of 2 MPa and the same temperature of 400°C. After going through the turbine, the steam is condensed in the condenser and exits as a saturated liquid at a pressure of 15 kPa. The electric generator has an efficiency of 96% and the pump has an isentropic efficiency of 90%. The heating value of the coal is 29.30 MJ/kg, analyze the given scenario to find the required amount of coal in tons to run the power plant for a month. also, draw the schematic diagram. need step-by-step solution and perfect calculations.
Steam is supplied to a turbine at a rate of 25kg/s at a pressure of 4000kPa and a temperature of 350°C. The steam enters the condenser at a pressure 100kPa. The expansion through the turbine is isentropic. For this Rankine cycle, determine: 2.1 the Rankine efficiency; he 2.2 the heat removed by the condenser per hour;
A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 6 MPa and 20 kPa. Steam enters the high pressure turbine at 6 MPa and leaves at 2 MPa. Steam is then reheated at constant pressure to same temperature. Heat is transferred to the steam in the boiler at a rate of 58,416 kJ/s. And the mass flow rate of steam through the cycle is 20 kg/s. The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 8 per cent. Steam is cooled in the condenser by the cooling water from a nearby river, and the temperature rise is 12°C. Show the cycle on a T-s diagram with respect to saturation lines, and determine the turbine inlet temperature; the net power output and thermal efficiency; and the minimum mass flow rate of the cooling water required
The network output and the thermal efficiency for the Carnot and the simple ideal Rankine cycles with steam as the working fluid are to be calculated and evaluated. Steam enters the turbine in both cases at 5 MPa as a saturated vapor, and the condenser pressure is 50 kPa. In the Rankine cycle, the condenser exit state is saturated liquid and in the Carnot cycle, the boiler inlet state is saturated liquid. Construct the T-s diagrams for both cycles.
A steam power plant operating in an ideal Rankine cycle with reheating is shown. Steam enters a high-pressure turbine at 16 MPa and 520°C. In reheating process, steam is reheated to 520°C again at the constant pressure of 8 MPa. If the condenser pressure is 6 kPa, • determine the enthalpy of the working fluid at the exit of the low pressure turbine • alculate the plant's thermal efficiency Boiler Turbine Condenser
A new power plant in Malaysia is going to use combined gas-steam power cycle. The gas turbine portion has a pressure ratio of 10. Air enters the compressor at 400 K at a rate of 16 kg/s and is heated to 1700 K in the combustion chamber. The combustion gases leaving the gas turbine are used to heat the steam to 500°C at 12.5 MPa in a heat exchanger. The combustion gases leave the heat exchanger at 380 K. The steam leaving the turbine is condensed at 20 kPa. Assuming all the compression and expansion processes to be isentropic and constant specific heats at room temperature for air. (a) determine the net power output,
1. Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 3 MPa and 350°C and is condensed in the condenser at a pressure of 75 kPa. Determine the thermal efficiency of this cycle.
Determine the specific work output, specific fuel consumption and thermal efficiency of a gas turbine power plant which produce a power output of 20 MW. The pressure ratio across the compressor is 4. Hot gases enters the turbine at 1100 K, the isentropic efficiencies of the compressor and turbine are 85% and 87% respectively. Pressure losses across the combustion chamber, heat exchanger air- side and heat exchanger gas-side are 0.08bar, 0.12bar and 0.04 bar respectively. The used fuel of LCV= 44000 kJ/kg, the heat exchanger effectiveness of 80%, ambient conditions are 1.0 bar and 288 K. Air/fuel ratio is 50:1 . Note for air γ= 1.4 and CP = 1.005 kJ/kg.K for hot gases γ= 1.33 and CP = 1.135 kJ/kg.K
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 Ave 53671
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 1.4 MPa and 500°C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. Assume both turbine and compressor are isentropic. Determine the thermal efficiency of the cycle. Use steam tables. The thermal efficiency of the cycle is 100 %.
A Rankine Cycle operates at a throttle pressure and temperature of 5 MPa and 450°C, respectively. The generator produces 20 MW at an efficiency of 95% while the mechanical efficiency is 97%. The actual expansion efficiency of the turbine is 85% and the pressure of the condenser is 10 kPa. Determine the ideal cycle steam rate in kg/kWh.