A combine (gas-steam) cycle produces 40 MW Por the gas cycle, the air enters the compressor at 27°C and 100 KPa, pressure ratio is 14, the flue gases exit the turbine at 412°C, and the mass flow rate of the working fluid is 62.5 kg/s. For the steam cycle, the maximum and minimum pressures are 12.5 MPa and 10 KPa respectively Determine the rate of hea added to the steam cycle and the thermal efficiency of the combined cycle. G M₂

A combine (gas-steam) cycle produces 40 MW Por the gas cycle, the air enters the compressor at 27°C and 100 KPa, pressure ratio is 14, the flue gases exit the turbine at 412°C, and the mass flow rate of the working fluid is 62.5 kg/s. For the steam cycle, the maximum and minimum pressures are 12.5 MPa and 10 KPa respectively Determine the rate of hea added to the steam cycle and the thermal efficiency of the combined cycle. G M₂

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

A combined gas turbine-vapor power plant has a net power output of 45 MW. Air enters the compressor of the gas turbine at 100 kPa, 300 K, and is compressed to 1200 kPa. The isentropic efficiency of the compressor is 84%. The condition at the inlet to the turbine is 1200 kPa, 1400 K. Air expands through the turbine, which has an isentropic efficiency of 88%, to a pressure of 100 kPa. The air then passes through the interconnecting heat exchanger and is finally discharged at 400 K. Steam enters the turbine of the vapor power cycle at 8 MPa, 400°C, and expands to the condenser pressure of 8 kPa. Water enters the pump as saturated liquid at 8 kPa. The turbine and pump of the vapor cycle have isentropic efficiencies of 90 and 80%, respectively. Thermodynamics calculation should be conducted for the known condition illustrated in Figure 1.a. Determine the mass flow rates of the air and the steam, each in kg/s, and the net power developed by the gas turbine and vapor power cycle, each in MW.…
Superheated steam generated in a power plant at a pressure of 8,600 kPa anda temperature of 500 ℃ is fed to a turbine. Exhaust from the turbine enters acondenser at 15 kPa, where it is condensed to saturated liquid, which is thenpumped to the boiler.(a) What is the thermal efficiency of a Rankine cycle operating at theseconditions?(b) What is the thermal efficiency of a practical cycle operating at theseconditions if the turbine efficiency and pump efficiency are both 75%?Which of the two efficiencies has greater impact on the thermal efficiency?(c) Sketch both cycles in the same T-s diagram.(d)If the power output of the turbine is 80,000 kW in case (b), calculate themass flow rate of the working fluid.(e) Calculate the heat transfer rates in the boiler and the condenser. Doublecheck the result for the condenser.(f) For both cases (a) and (b), make a comment about the operation of turbine(issue of cavitation). [one sentence is fine](g) How you would operate the condenser of a practical…
The net power output of the turbine in an ideal reheat-regenertive cycle is 100 MW. Steam enters the high-pressure (H.P.) turbine at 90 bar, 550°C. After .expansion to 7 bar, some of the steam goes to an open heater and the balance is reheated to 400°C, after which it expands to 0.07 bar. (a) What is the steam flow rate to the H.P. turbine? (b) What is the total pump work? (c) Calculate the cycle efficiency. (d) If there is a 10c°rise in the temperature of the cooling 'water, what is the rate of flow of the cooling water in the condenser? (e) If the velocity of the steam flowing from the turbine to the condenser is limited to a maximum of 130 m/s, find the diameter of the connecting pipe.
Instead, assume variable specific heat A gas-turbine power plant operates on the simpleBrayton cycle between the pressure limits of 100 and 800 kPa.Air enters the compressor at 308C and leaves at 3308C at amass flow rate of 200 kg/s. The maximum cycle temperatureis 1400 K. During operation of the cycle, the net power outputis measured experimentally to be 60 MW. Assume constantproperties for air at 300 K with cv 5 0.718 kJ/kg·K, cp 51.005 kJ/kg·K, R 5 0.287 kJ/kg·K, k 5 l.4.(a) Sketch the T-s diagram for the cycle.(b) Determine the isentropic efficiency of the turbine forthese operating conditions.(c) Determine the cycle thermal efficiency.
Steam is the working fluid in an actual Rankine cycle. Steam enters the turbine at 8.0 MPa and 550 deg. C; and saturated liquid exits the condenser at a pressure of 0.008 MPa. The net power output of the cycle is 110 MW. The turbine and the pump each have an isentropic efficiency of 83% Illustrate and label the TS diagram and determine the cycle (a) the cycle thermal efficiency (b) the back work ratio (c)the mass flow rate of the steam, in kg/h, (d) the rate of heat transfer into the working fluid as it passes through the boiler, in MW, (e) the rate of heat transfer, from the condensing steam, as it passes through the condenser, in MW, (f) the mass flow rate of the condenser cooling water, in kg/hr., if cooling water enters the condenser at 15 deg. C and exits at 35 deg. C.
Steam at 6.155MPa and 435degC enters the turbine of a power plant which operates on actual vaport power cycle. The pressure at the exit of the turbine is 418 kPa, and steam leaves the condenser as a saturated liquid at 62degC. The pressure is increased to 12.2 MPa accross the pump. The turbine and pump have isentropic efficiencies of 82% and 74% respectively. For this cycle, determine th: a. Wnet per unit mass of steam flow and the heat transfer to steam passing through the boiler (kj/kg)b. thermal efficiency (%) c. heat transfer to colling water passing the condenser (kj/kg of steam condensed)
Water is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 12 MPa, 520°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1.2 MPa and then is reheated to 480°C. Assume the pump and each turbine stage has an isentropic efficiency of 85% and 92%, respectively. Determine for the cycle:(a) the rate of heat addition, in kJ per kg of steam entering the first-stage turbine.(b) the thermal efficiency.(c) the rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.(d) the back work ratio.
In an ideal reheat cycle, the steam throttled condition is 9MPa and 480 oC. The steam is then reheated to 2MPa and 460 oC. If turbine exhaust is 60 oC, Determine cycle efficiency.
2. The compression ratio of an air-standard Otto cycle is 9.5. Prior to the isentropic compressionprocess, the air is at 100 kPa, 35°C, and 600 cm3. The temperature at the end of the isentropicexpansion process is 800 K. Using specific heat values at room temperature, determine (a) thehighest temperature and pressure in the cycle; (b) the amount of heat transferred in, in kJ; (c)the thermal efficiency; and (d) the mean effective pressure.
A steam power plant operates under a regenerative Rankine cycle. Steam at 20 MPa and 600oC enters the turbine and exhausts to a condenser pressure of 25 kPa. Some portion of the steam is extracted at 1 MPa and utilized for feedwater heating. The feedwater leaves the open heater as a saturated liquid at extraction pressure. For a boiler feed water flow rate of 150 kg/s, calculate (a) the mass flow rate of bleed steam, in kg/hr, (b) turbine power output, in MW, (c) the required power input to the pump, in kW, and (d) the plant thermal efficiency.
Water is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 12 MPa, 560°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1.2 MPa and then is reheated to 480°C. Assume the pump and each turbine stage has an isentropic efficiency of 85% and 92%, respectively. Determine for the cycle: (a) the rate of heat addition, in kJ per kg of steam entering the first-stage turbine. (b) the thermal efficiency. (c) the rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine. (d) the back work ratio. PLEASE SHOW COMPLETE SOLUTION WITH EXPLANATION
Steam at 10 MPa, 600C enters the first-stage turbine of an ideal Rankine cycle with reheat. The steam leaving the reheat section of the steam generator is at 500C, and the condenser pressure is 6 kPa. If the quality at the exit of the second stage turbine is 90%, determine the cycle thermal efficiency.