Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Ge, Yanlin; Chen, Lingen; Sun, Fengrui

doi:10.3390/e18040139

Cited by 139 publications

(40 citation statements)

References 223 publications

(428 reference statements)

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“…There are so many studies related to optimization and numerical modeling of internal combustion engines in the literatures. [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67] This study has firstly developed a novel cycle to provide more controllable combustion temperatures at higher performance for internal combustion engines.…”

Section: Novelty Statementmentioning

confidence: 99%

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Performance analysis of a novel eco‐friendly internal combustion engine cycle

Gonca

Şahi̇n

2019

Int J Energy Res

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Summary The Miller cycle applications have been performed to diminish NOx released from internal combustion engines (ICEs), in recent years. The Miller cycle provides decreased compression ratio and enhanced expansion ratio; hereby, maximum in‐cylinder combustion temperatures diminish, and NOx formations slow down remarkably. Another less‐known method is Takemura cycle application, which provides heat addition into engine cylinder at constant combustion temperatures. In this study, a novel cycle including the Miller cycle and the Takemura cycle has been developed by using novel numerical models and computing methods with seven processes and a novel way to decrease NOx emissions at higher levels compared with the single applications of known cycles. A comprehensive performance examination of the proposed cycle engine in terms of performance characteristics such as effective power (EFP), effective power density (EFPD), exergy destruction (X), exergy efficiency (ε), and ecological coefficient of performance (ECOP) has been conducted. The impacts of engine operating and design parameters on the performance characteristics have been computationally examined. Furthermore, irreversibilities depending on incomplete combustion loss (INCL), exhaust output loss (EXOL), heat transfer loss (HTRL), and friction loss (FRL) have been considered in the performance simulations. The minimum exergy destruction and maximum performance specifications have been observed with 30 of the compression ratio. Maximum effective power values have been obtained at range between 1 and 1.2 of equivalence ratio. The optimum range for exergy efficiency is between 0.8 and 1 of equivalence ratio. Increasing engine speed has provided enhancing effective power. However, an optimum range has been found for the exergy efficiency that is interval of 3000 to 4000 rpm. The results obtained can be assessed by researchers studying on modeling of the engine systems and designs.

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Section: Novelty Statementmentioning

confidence: 99%

“…The engine researchers also carried out so many studies on dual cycle engines and dual MC engines to improve thermal efficiency and network output. There are so many studies related to optimization and numerical modeling of internal combustion engines in the literatures …”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a novel eco‐friendly internal combustion engine cycle

Gonca

Şahi̇n

2019

Int J Energy Res

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“…For examples, based on MPE, the incoordination problems between procedures of the ISPP can be solved, and the global optimization results of the ISPP can be obtained, rather than the local optimization results of the procedures. Three representative theories of modern thermodynamics are finite time thermodynamics (FTT) [7][8][9][10][11][12][13][14] or entropy generation minimization (EGM) [15][16][17], constructal theory [18][19][20][21][22][23] and entransy theory [24][25][26][27]. There are many irreversible processes in the ISPP.…”

Section: Introductionmentioning

confidence: 99%

Generalized Thermodynamic Optimization for Iron and Steel Production Processes: Theoretical Exploration and Application Cases

Chen

Feng

Xie

2016

Entropy

Self Cite

110

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Abstract:Combining modern thermodynamics theory branches, including finite time thermodynamics or entropy generation minimization, constructal theory and entransy theory, with metallurgical process engineering, this paper provides a new exploration on generalized thermodynamic optimization theory for iron and steel production processes. The theoretical core is to thermodynamically optimize performances of elemental packages, working procedure modules, functional subsystems, and whole process of iron and steel production processes with real finite-resource and/or finite-size constraints with various irreversibilities toward saving energy, decreasing consumption, reducing emission and increasing yield, and to achieve the comprehensive coordination among the material flow, energy flow and environment of the hierarchical process systems. A series of application cases of the theory are reviewed. It can provide a new angle of view for the iron and steel production processes from thermodynamics, and can also provide some guidelines for other process industries.

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“…FoC(ψ) = 0.672 · e −0.874·ψ (8) Equation (8) is based on measured global energy efficiency for heat engines in a very large range of capacities, temperatures, and technical solutions. Yet, it is remarkably consistent.…”

Section: Global Efficiency Of Heat Pumpsmentioning

confidence: 99%

“…Dong et al [7] explain a general method to obtain optimal operating points for endo-reversible and irreversible heat engines. Ge et al [8] explain the advances in finite-time thermodynamics for internal combustion cycle optimization. Feidt [9] explains the development in some traditions of thermodynamic analysis and that FTT is based on the idea of reversible cycle operating with irreversible heat exchange.…”

Section: Introductionmentioning

confidence: 99%

Global Efficiency of Heat Engines and Heat Pumps with Non-Linear Boundary Conditions

Lundqvist¹,

Öhman²

2017

Entropy

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Analysis of global energy efficiency of thermal systems is of practical importance for a number of reasons. Cycles and processes used in thermal systems exist in very different configurations, making comparison difficult if specific models are required to analyze specific thermal systems. Thermal systems with small temperature differences between a hot side and a cold side also suffer from difficulties due to heat transfer pinch point effects. Such pinch points are consequences of thermal systems design and must therefore be integrated in the global evaluation. In optimizing thermal systems, detailed entropy generation analysis is suitable to identify performance losses caused by cycle components. In plant analysis, a similar logic applies with the difference that the thermal system is then only a component, often industrially standardized. This article presents how a thermodynamic "black box" method for defining and comparing thermal efficiency of different size and types of heat engines can be extended to also compare heat pumps of different apparent magnitude and type. Impact of a non-linear boundary condition on reversible thermal efficiency is exemplified and a correlation of average real heat engine efficiencies is discussed in the light of linear and non-linear boundary conditions.

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Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Cited by 139 publications

References 223 publications

Performance analysis of a novel eco‐friendly internal combustion engine cycle

Performance analysis of a novel eco‐friendly internal combustion engine cycle

Generalized Thermodynamic Optimization for Iron and Steel Production Processes: Theoretical Exploration and Application Cases

Global Efficiency of Heat Engines and Heat Pumps with Non-Linear Boundary Conditions

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