Thermal Efficiency Of Combined Cycle Power Plant
: Variation of rate of inlet temperatures (K) withgas turbine heat supplied (Q)The above Fig. (6) Shows the variation of inlettemperatures with heat supplied in gas turbine (Q).Temperature increase is more in Brayton cycle (toppingcycle) compared to Rankine cycle (bottoming cycle). Asthe heat supplied in gas turbine the inlet temperature of itincrease and as well as steam turbine inlet temperatureincreases. At a particular point of heat supplied it wasfound that the inlet temperature of gas turbine is more thaninlet temperature of steam turbine.Fig. 7: Variation of boiler pressure (P) with gas turbineheat supplied (Q) The above Fig. (7) Gives a variationof boiler pressure (P) with gas turbine heat supplied(Q). It is noted that as gas turbine heat suppliedincreases the boiler pressure in bottoming cyclegradually increases gives more heat.233Fig. 8: Variation of rate of Wnet with gas turbine heatsupplied (Q)The above Fig. (8) shows the variation of network done with gas turbine heat supplied (Q). It is foundthat the work output of combined cycle power plant ismore than that of steam power cycle and gas turbine cyclebecause combined cycle power plant work done is the sumof the work done of Rankine cycle power plant and gasturbine power plant. In gas turbine power plant itconsumes more work in compressor so it won’t be able toproduce more work output. In Rankine cycle, pumpconsumes very less work so that it produces somewhathigh power output compared to the gas turbine.Fig. 9: Variation of efficiency (η) with gas turbine heatsupplied (Q)The above Fig. (9) gives a variation of efficiency(η) with gas turbine heat supplied (Q). It is observed thatwhen heat supplied to the gas turbine increases, efficiencyof the gas turbine, steam turbine and combined cycleefficiency also increases, in the above fig (6.4) efficiencyCopyright 2018. IJEMR. All Rights Reserved.
www.ijemr.netISSN (ONLINE): 2250-0758, ISSN (PRINT): 2394-6962of Ranking cycle is more than efficiency of gas turbinecycle.steam turbine and combined cycle gas turbine are found toincrease respectively.ACKNOWLEDGMENTWe, authors express gratitude to all theanonymous reviewers for their affirmative annotationsamong our paper. Thanks to every reviewer for reviewingour paper and give valuable suggestions.REFERENCESFig. 10: Variation of rate of efficiency η (ST) withboiler pressure (P) barThe above Fig. (10) shows the variation ofefficiency η (ST) with boiler pressure (P) bar whenpressure of steam boiler increases the efficiency of steampower plant increases.V.CONCLUSIONSThe following conclusions are arrived when the inputparameters of a combined cycle power plant is taken.Varying heat input to the gas turbine from 475 MW to 550MW and maintaining compression ratio is 8.1. Input temperature of the gas turbine varies from 876.528K to 1026.658 K an increase of 41.62%. Input temperatureof the steam turbine varies from 781.23 K to 858.36 K anincrease of 35.82%.2. Boiler pressure of the plant varies from 167 bar to 205bar an increase of 33.58%.3. Net work done by the gas turbine varies from 91.65 MWto 166.729 MW an increase of 29.36%. Net work done bythe steam turbine varies from 643.606 MW to 692.848MW an increase of 35.86%. Net work done by thecombined cycle varies from 752.864 MW to 843.843.75MW an increase of 39.64%.4. The efficiency of the gas turbine varies from 19.86% to44.86% an increase of 23.64%. The efficiency of the steamturbine varies from 26.179% to 51.62% an increase of29.58%. The efficiency of the combined cycle varies from30.624% to 55.91% an increase of 35.69%.5. The boiler input pressure of the plant varies from 167bar to 205 bar an increase of 33.58%. The efficiency of thesteam turbine varies from 26.179% to 51.62% an increaseof 29.58%.6. The input parameters of gas turbine and steam turbinesuch as inlet temperatures, input pressures increases,output parameters like work output of the gas turbine,234[1] Thamir K. Ibrahim & M.M. Rahman. (2012). Effect ofcompression ratio on performance of combined cycle gasturbine. International Journal of Energy Engineering, 2(1),9-14.[2] Ashley De Sa & Sarim Al Zubaidy. (2011). Gas turbineperformance at varying ambient temperature. AppliedThermal Engineering, 31, 2735–2739.[3] Carniere H., Willocx A., Dick E., & Paepe M De.,(2006). Raising cycle efficiency by inter cooling in aircooled gas turbine. Applied Thermal Engineering, 26(16),1780–1787.[4] AlHazmy M.M. & Najjar Y.S.H. (2004). Augmentationof gas turbine performance using air coolers. AppliedThermal Engineering, 24(2-3), 415-429.[5] P.k. Sarma, K.Hari Babu , T.Subrahmanyam,V.Dharma Rao, & P.S.Kishore. (2006, March).Augmentation of convective condensation of steam in ahorizontal tube with twisted tape inserts. (World scientificand engineering academy and society) Transations onHeat and Mass Transfer, 1(3), 222-228.[6] Thamir K. Ibrahim & Rahman M.M. (2012). Thermalimpact of operating conditions on the performance of acombined cycle gas turbine. Journal of Applied Researchand Technology, 10(4), 567–577.[7] Firdaus B., Takanobu Y., Kimio N., & Soe N. (2011).Effect of ambient temperature on the performance of microgas turbine with cogeneration system in cold region.Applied Thermal Engineering, 31, a,P.S.Kishore, & V.Dharma Rao. (2009, June). A method topredict turbulent convective heat transfer coefficients ofcondensation of steam-air mixture in a horizontal tube.International Journal of Heat and Technology, 27(1), 4556.[9] Kaushika S.C., Reddya V.S., & Tyagi S.K. (2011).Energy and exergy analyses of thermal power plants: Areview. Renewable Sustainable Energy Review, 15, 1857–1872.[10] Khaliq A. & Kaushik S.C. (2004). Thermodynamicperformance evaluation of combustion gas turbinecogeneration system with reheat. Applied ThermalEngineering, 24(13), 1785–1795.Copyright 2018. IJEMR. All Rights Reserved.
The combined cycle power plant is a combination of simple gas turbine plant which is treated to be a topping cycle and ranking cycle which is treated to be a bottoming cycle. The combined cycle plant layout Fig 3.1 is given below.The practical combined cycle power plant. It is
COMBINED GAS–VAPOR POWER CYCLES The continued quest for higher thermal efficiencies has resulted in rather innovative modifications to conventional power plants. A popular modification involves a gas power cycle topping a vapor power cycle, which is called the combined gas–vapor cycle, or just the combined cycle.
Energies 2018, 11, 1879 3 of 14 R3 Thermal resistance of the air space between a panel and the roof surface. R4 Thermal resistance of roof material (tiles or metal sheet). R5 Thermal resistance of the air gap between the roof material and a sarking sheet. R6 Thermal resistance of a gabled roof space. R7 Thermal resistance of the insulation above the ceiling. R8 Thermal resistance of ceiling .
Thermal Control System for High Watt Density - Low thermal resistance is needed to minimize temperature rise in die-level testing Rapid Setting Temperature Change - High response thermal control for high power die - Reducing die-level test time Thermal Model for New Thermal Control System - Predict thermal performance for variety die conditions
thermal models is presented for electronic parts. The thermal model of an electronic part is extracted from its detailed geometry configuration and material properties, so multiple thermal models can form a thermal network for complex steady-state and transient analyses of a system design. The extracted thermal model has the following .
Thermal Transfer Overprinting is a printing process that applies a code to a flexible film or label by using a thermal printhead and a thermal ribbon. TTO uses a thermal printhead and thermal transfer ribbon. The printhead comprises a ceramic coating, covering a row of thermal pixels at a resolution of 12 printing dots per mm
100% duty cycle 300 A at 32 V, 60% duty cycle 200 A at 28 V, 100% duty cycle 250 A at 30 V, 60% duty cycle 500 A at 40 V, 100% duty cycle 600 A at 44 V, 60% duty cycle 400 A at 36 V, 100% duty cycle 500 A at 40 V, 60% duty cycle Welding Amperage Range 3–400 A 3–400 A 5–800 A 5–800 A Model
Triennial Cycle (Triennial Torah Cycle) / Septennial Cycle (Septennial Torah Cycle) Three and 1/2 year Lectionary Readings First Year of the Triennial Reading Cycle Tammuz
influence of ideological values on the policies and practices of America’s criminal justice systems. Recently, however, a trend toward critical analysis of the behavior of police, courts, and corrections has emerged that focuses exclusively on ideology as the analytical tool of choice. For example, Barlow (2000), and Bohm and Haley (2001) include extensive discussion of the influence of .
