A new comparative study on performance of engine cycles under maximum thermal efficiency condition

As the parameters involved in the brake thermal efficiency of the engine cycles affect each other, the simultaneous investigation of the critical parameters, non-critical parameters, and the maximum temperature of the working fluid involved to optimize the brake thermal efficiency of the engine cycl...

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Autor principal:	Rahim Ebrahimi
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Thermodynamic optimization Brake thermal efficiency Variable specific heat ratio Heat-transfer Friction Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/6b146f55428a49f88d343246e4ec30fa
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id	oai:doaj.org-article:6b146f55428a49f88d343246e4ec30fa
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spelling	oai:doaj.org-article:6b146f55428a49f88d343246e4ec30fa2021-12-04T04:35:15ZA new comparative study on performance of engine cycles under maximum thermal efficiency condition2352-484710.1016/j.egyr.2021.11.221https://doaj.org/article/6b146f55428a49f88d343246e4ec30fa2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721013664https://doaj.org/toc/2352-4847As the parameters involved in the brake thermal efficiency of the engine cycles affect each other, the simultaneous investigation of the critical parameters, non-critical parameters, and the maximum temperature of the working fluid involved to optimize the brake thermal efficiency of the engine cycles is vital to implement the theoretical proposition into practical design perspectives. For this reason, a new method to compare the thermal efficiency of the engine cycles has been carried out with the simultaneous application of the optimal cycle design parameters (the geometric-compression ratio, expansion–compression ratio, and pressure ratio), the operating parameters (the heat-transfer loss, heat-release during combustion, friction loss, temperature-dependent specific heat ratio of the working fluid, and initial temperature of the working fluid), and the maximum temperature of the working fluid. The numerical examples show that the largest brake thermal efficiency is for the Dual-Miller cycle (46.32%) as compared to that for the classical-Otto (42.41%), classical-Diesel, classical-dual (40.22%), Otto-Miller (45.32%), Diesel-Miller (40.27%), Otto-Atkinson (42.31%), Diesel-Atkinson (32.19%), and dual-Atkinson (42.34%) cycles. When the heat-release during combustion and temperature-dependent specific heat ratio of the working fluid increased, the brake thermal efficiency of the Dual-Miller cycle rises and then begins to abate. As the heat-transfer coefficient, friction coefficient and initial temperature of the working fluid increased by about 20%, the brake thermal efficiency of the Dual-Miller cycle decreases by about 1.3%, 1.1%, and 3%, respectively. The numerical examples also show that the brake thermal efficiency of the Dual-Miller cycle first increases with increasing the maximum temperature of the working fluid, reaches its maximum value (43.01%) and then remains constant with further increases in the maximum temperature of the working fluid.Rahim EbrahimiElsevierarticleThermodynamic optimizationBrake thermal efficiencyVariable specific heat ratioHeat-transferFrictionElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8858-8867 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermodynamic optimization Brake thermal efficiency Variable specific heat ratio Heat-transfer Friction Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Thermodynamic optimization Brake thermal efficiency Variable specific heat ratio Heat-transfer Friction Electrical engineering. Electronics. Nuclear engineering TK1-9971 Rahim Ebrahimi A new comparative study on performance of engine cycles under maximum thermal efficiency condition
description	As the parameters involved in the brake thermal efficiency of the engine cycles affect each other, the simultaneous investigation of the critical parameters, non-critical parameters, and the maximum temperature of the working fluid involved to optimize the brake thermal efficiency of the engine cycles is vital to implement the theoretical proposition into practical design perspectives. For this reason, a new method to compare the thermal efficiency of the engine cycles has been carried out with the simultaneous application of the optimal cycle design parameters (the geometric-compression ratio, expansion–compression ratio, and pressure ratio), the operating parameters (the heat-transfer loss, heat-release during combustion, friction loss, temperature-dependent specific heat ratio of the working fluid, and initial temperature of the working fluid), and the maximum temperature of the working fluid. The numerical examples show that the largest brake thermal efficiency is for the Dual-Miller cycle (46.32%) as compared to that for the classical-Otto (42.41%), classical-Diesel, classical-dual (40.22%), Otto-Miller (45.32%), Diesel-Miller (40.27%), Otto-Atkinson (42.31%), Diesel-Atkinson (32.19%), and dual-Atkinson (42.34%) cycles. When the heat-release during combustion and temperature-dependent specific heat ratio of the working fluid increased, the brake thermal efficiency of the Dual-Miller cycle rises and then begins to abate. As the heat-transfer coefficient, friction coefficient and initial temperature of the working fluid increased by about 20%, the brake thermal efficiency of the Dual-Miller cycle decreases by about 1.3%, 1.1%, and 3%, respectively. The numerical examples also show that the brake thermal efficiency of the Dual-Miller cycle first increases with increasing the maximum temperature of the working fluid, reaches its maximum value (43.01%) and then remains constant with further increases in the maximum temperature of the working fluid.
format	article
author	Rahim Ebrahimi
author_facet	Rahim Ebrahimi
author_sort	Rahim Ebrahimi
title	A new comparative study on performance of engine cycles under maximum thermal efficiency condition
title_short	A new comparative study on performance of engine cycles under maximum thermal efficiency condition
title_full	A new comparative study on performance of engine cycles under maximum thermal efficiency condition
title_fullStr	A new comparative study on performance of engine cycles under maximum thermal efficiency condition
title_full_unstemmed	A new comparative study on performance of engine cycles under maximum thermal efficiency condition
title_sort	new comparative study on performance of engine cycles under maximum thermal efficiency condition
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6b146f55428a49f88d343246e4ec30fa
work_keys_str_mv	AT rahimebrahimi anewcomparativestudyonperformanceofenginecyclesundermaximumthermalefficiencycondition AT rahimebrahimi newcomparativestudyonperformanceofenginecyclesundermaximumthermalefficiencycondition
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A new comparative study on performance of engine cycles under maximum thermal efficiency condition

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