2.6).A gas-turbine plant operates on the regenerative Brayton cycle with two stages of reheatingand two stages of intercooling between the pressure limits of 100 and 1200 kPa. The workingfluid is air. The air enters the first and theRegeneratorsecond stages of the compressor at 300 Kand 350 K, respectively, and the first andReheaterthe second stages of the turbine atComb.cham.1400 Kand1300 K, respectively.6WnetAssuming both the compressor and theComp. IComp. IITurb. ITurb. IIturbine have an isentropic efficiency of80% andthe regenerator hasaneffectiveness of 75%, determine (a) theFig. p2.6.Intercoolerback-work ratio and the network output,For two-stage compression and expansion, thework input is minimized and the work output ismaximized when both stages of the compressorand the turbine have the same pressure ratio.and (b) the thermal efficiency.2.7).A simple gas turbine, has the following data:Compressor pressure ratio,p = 20Turbine inlet temperature,T3= 1400 KCompressor isentropic efficiency,Nc = 0.87Turbine isentropic efficiency,Ne = 0.9Combustor pressure loss,AP = 5%Combustion efficiency,Пь 3 0.99Ambient conditions, Pa, Ta,1.013 bar, 288 KIgnore inlet and exhaust losses, draw cycle on T - s diagram and calculate:a)Turbine pressure ratio.b)The net specific output work.c)The gas turbine thermal efficiency.2.8).For the simple gas turbine, in problem (2.7), which produces 100 MW, calculate:а)Air mass flow rate.b)Fuel mass flow rate if the calorific value of kerosene fuel burned is 43.2 MJ/kg.c)Theoretical air to fuel ratio.

Isentropic efficiency of turbine and compressor is 80% Effectiveness of regenerator is 75% find a)…

2.6). A gas-turbine plant operates on the regenerative Brayton cycle with two stages of reheating and two stages of intercooling between the pressure limits of 100 and 1200 kPa. The working fluid is air. The air enters the first and the Regenerator second stages of the compressor at 300 K and 350 K, respectively, and the first and Reheater the second stages of the turbine at Comb. cham. 1400 K and 1300 K, respectively. 6 Wnet Assuming both the compressor and the Comp. I Comp. II Turb. I Turb. II turbine have an isentropic efficiency of 3 80% and the regenerator has an effectiveness of 75%, determine (a) the Fig. p2.6. Intercooler back-work ratio and the network output, For two-stage compression and expansion, the work input is minimized and the work output is and (b) the thermal efficiency. maximized when both stages of the compressor

2.6). A gas-turbine plant operates on the regenerative Brayton cycle with two stages of reheating and two stages of intercooling between the pressure limits of 100 and 1200 kPa. The working fluid is air. The air enters the first and the Regenerator second stages of the compressor at 300 K and 350 K, respectively, and the first and Reheater the second stages of the turbine at Comb. cham. 1400 K and 1300 K, respectively. 6 Wnet Assuming both the compressor and the Comp. I Comp. II Turb. I Turb. II turbine have an isentropic efficiency of 3 80% and the regenerator has an effectiveness of 75%, determine (a) the Fig. p2.6. Intercooler back-work ratio and the network output, For two-stage compression and expansion, the work input is minimized and the work output is and (b) the thermal efficiency. maximized when both stages of the compressor

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

the back work ratio and the thermal efficiency of the cycle assuming a regenerator with 75 and constant specific heats is used with C0.718 kJ/kg.K and C1.005 kJ/kg.K. Determine expansion. The pressure ratio across cach stage of the compressor and turbine is 3. The air Q2: Consider an ideal gas-turbine cycle with two stages of compression and two stages of kinetic and potential energy changes are negligible. The air standard assumptions are applicable enters cach stage of the compressor at 300 K and each stage of the turbine at 1200 K. The percent effectiveness is used.
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.
A medium size power station is used to produce 30 MW net power for arefinery. The station uses steam as the operating fluid and operatesaccording to the Carnot cycle between the pressure limits of 0.4 bar and35 bar. Steam enters the boiler as a saturated liquid and leaves it as adry saturated vapour. (i) Calculate the thermal efficiency of the power station if theisentropic efficiency of the steam turbine is 94%. (ii) State main disadvantages of using the Carnot cycle as the basis fora power station. (iii) State the name of the cycle that is used in practice in powerstations, along with three key benefits over the Carnot cycle.
.
A gas turbine power plant is operated between 1 bar and 9 bar pressures,and minimum and maximum cycle temperatures are 27°C and 1127°C.Compression is carried out in two stages with intercooling such that thetemperature of the air entering each stage of the compressor are equal. Thegases coming out from H.P.T turbine are heated to 1127°C before enteringL.P. turbine. The expansions in both turbines are arranged in such a waythat the first stage develops work twice the second stage. Assumingcompressors and turbines isentropic efficiencies are 82%. Determine thecycle efficiency assuming ideal regenerator.
A gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 18 k and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb.Draw pv and Ts diagram and label itCalculate the power required by the compressordDetermine the pressure and the temperature at the turbine exit,Compute the power produced by the turbinef.Available specific workg.The thermal efficiency
Please help with this Question 2. Please it's urgent.
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…
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…
A 120 MW gas turbine power plant running on Ideal Brayton cycle has the followinginitial conditions; air at 22°C & 95 kPa. The compression ratio is 7 and the temperature atthe turbine entrance is 910°C. Determine the following: a. Pressure & temperature at each stateb. T-S diagramc. Heat Added, per unit mass
In an ideal steam cycle, steam at (20 bar, 360 C°) is expanded in a turbine to (0.08 bar). It then enters a condenser where it is condensed to saturated liquid water. Then the 4- pump feeds back the water into the boiler. Find per kg of steam (a) Wnet (b) nth (c) if(nr = nP = 80%), find the percentage reduction in wnet andnth Ans. (a) 969.61 (kj/kg) (b) 32.5% (c) 20.1 % (d) 20.1 %
An idealcold air-standard Brayton cycle produces some quantity of power. Air with a mass flow rate of 6 kg/s enters the compressor at 100 kPa, 300 K.It is also known that the compressor has a pressure ratio of 10 and the turbine inlet temperature is 1400 K.If k = 1.4for the working fluid, determine the thermal efficiency, the ratio of back work, and the net power for the cycle in kW.