Effects of friction and temperature-dependent specific-heat of the working fluid on the performance of a Diesel-engine

Al–Sarkhi, A.; Jaber, J.O.; Abu-Qudais, Moh’d; Probert, S.D.

doi:10.1016/j.apenergy.2005.01.001

Cited by 45 publications

(42 citation statements)

References 22 publications

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“…The fluid work and thermal efficiency versus compression ratio characteristics are approximately parabolic-like curves and the fluid work output versus efficiency curve is loop shaped. They reflect the performance characteristics of a real irreversible Diesel cycle engine (Al-Sarkhi et al 2006). With the change in compression ratio, engine processes that influence its performance and efficiency, namely, combustion rate, heat transfer and friction, also vary.…”

Section: Design Conditions and Numerical Simulationmentioning

confidence: 99%

“…Biodiesel used in this study is mainly fatty acids methyl esters of rapeseed oil, which fulfilled norm EN 14214 (Dzida and Prusakiewicz 2008). Table 3 shows the relative a, b and k to calculate the specific heat constants of diesel, biodiesel and B20 fuels (Ge et al 2005;Al-Sarkhi et al 2006;Ge et al 2006;Dzida and Prusakiewicz 2008;Lin and Hou 2008).…”

Section: Design Conditions and Numerical Simulationmentioning

confidence: 99%

“…Therefore, the equation often used for a reversible adiabatic-process, with constant k, cannot be used for a reversible adiabatic-process with variable k. However, a suitable engineering approximation for the reversible adiabatic-process with variable k can be assumed (i.e. the process can be broken up into a large number of infinitesimally small steps and for each of these, the adiabatic exponent k can be regarded as a constant) (Al-Sarkhi et al 2006;Ghatak and Chakraborty 2007). For example, any reversible adiabatic-process between states i and j can be regarded as consisting of numerous infinitesimally small processes, for each of which a slightly different value of k applies.…”

Section: General Description Of the Modelmentioning

confidence: 99%

“…Chen et al (2003 determined the characteristics of power and efficiency for Otto, Dual cycles with heat transfers and friction losses. Al-Sarkhi et al (2006) determined the performance of an irreversible Diesel cycle with losses arising from heat resistance and friction. Al-Hinti et al (2008) evaluated the maximum net power output and cycle thermal efficiency of an air-standard Diesel cycle as functions of more realistic parameters such as cut-off ratio.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Jeshvaghani

Fallahipanah

Gahruei

et al. 2013

Int. J. Environ. Sci. Technol.

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Because of environmental problems, it becomes necessary to develop alternative fuels that give engine performance at par with diesel. Among the alternative fuels, biodiesel and its blends hold good promises as an eco-friendly and the most promising alternative fuel for Diesel engine. The properties of biodiesel and its blends are found similar to that of diesel. Many researchers have experimentally evaluated the performance characteristics of conventional Diesel engines fueled by biodiesel and its blends. However, experiments require enormous effort, money and time. Hence, via finite-time thermodynamics simulation, an air-standard Diesel cycle model with heat transfer loss and variable specific heats of working fluid is analyzed to predict the performance of Diesel engine. The effect of compression ratio, cut-off ratio and fuel type on output work and thermal efficiency is investigated through the model. The fuels considered for the analysis are conventional diesel, rapeseed oil biodiesel and its blend (20 % biodiesel and 80 % diesel by volume). Numerical simulations showed that the output work and thermal efficiency of the engine decrease with increase of cut-off ratio for all fuels. Also, the model predicts similar performance with diesel and biodiesel blend which means that the biodiesel blend (20 % biodiesel and 80 % diesel by volume) could be a good alternative and eco-friendly fuel for conventional Diesel engines without any need to modify the engine.

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Section: Design Conditions and Numerical Simulationmentioning

confidence: 99%

Section: Design Conditions and Numerical Simulationmentioning

confidence: 99%

Section: General Description Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Jeshvaghani

Fallahipanah

Gahruei

et al. 2013

Int. J. Environ. Sci. Technol.

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“…In a reality, the specific heat of the air researchers called NASA polynomial equation [18]. They curve is nearly linear to a close approximation [19,20], P By use of the physical properties of air at different and 0.083, respectively [1]. By substituting Eq.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Thermal Analysis of Solar Air Heater for the Purpose of Energy Saving

Gorji¹

2012

IJEE

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Abstract:In this article, nonlinear thermal Analysis of air-heating flat-plate solar collectors was conducted to obtain temperature distribution inside the heat transfer unit. Due to temperature-dependency of specific heat coefficient of air, the governing differential equation had a noticeable nonlinear nature. Therefore, for the solution of nonlinear equation a highly accurate and simple analytical method which is called Differential Transformation Method (DTM) and basic numerical method, Runge-Kutta (RG) was employed. As a significant result, it is depicted that the DTM results have an interesting conformity with numerical ones. After this verification, the effects of physical applicable parameters on temperature distribution, useful gained heat and thermal efficiency of collectors were investigated. It was concluded that increase in dimension of collector may not increase the efficiency (about 10% decreased). However an increase in the effectiveness coefficient ( ) and air mass flow rate ( ) enhanced the performance of solar collectors and the process efficiency increased up to 12%.

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New thermodynamic analysis and optimization of performance of an irreversible diesel cycle

Ahmadi

Açıkkalp

et al. 2017

Env Prog and Sustain Energy

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In this study, an irreversible Diesel cycle is investigated based on entransy method and optimization conducted by considering various scenarios. Entransy expressed as a heat transfer potential of a subject and it has begun to investigate as a new thermodynamic assessment parameter. This paper presents thermodynamical study of an irreversible Diesel cycle in order to optimize its performance. Moreover, four different strategies in the process of multiobjective optimization are proposed, and the outcomes are assessing separately. The first strategy is proposed to minimize the entransy dissipation rate and maximize the ecological coefficient of performance along with the maximum available work. Furthermore, the second one is suggested to minimize the entransy dissipation rate and maximize the ecological function along with the exergetic performance criteria. The third strategy is proposed to minimize ethe entransy dissipation rate and maximize the ecological function along with the thermal efficiency. Moreover, the fourth strategy is suggested to achieve the minimum entransy dissipation rate and maximum ecological function along with the entransy efficiency. Finally, the values of objective functions were obtained at the optimum conditions of each scenario; afterwards, compared with other scenarios to select the most appropriate one. Based on obtained results, maximizing ecological coefficient of performance is the most appropriate approach for optimization, since it leads to the maximum values of ecological function, exergetic performance criteria and thermal efficiency. In addition, in the fourth scenario the lowest entransy dissipation rate was achieved. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1475–1490, 2018

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Effects of friction and temperature-dependent specific-heat of the working fluid on the performance of a Diesel-engine

Cited by 45 publications

References 22 publications

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Nonlinear Thermal Analysis of Solar Air Heater for the Purpose of Energy Saving

New thermodynamic analysis and optimization of performance of an irreversible diesel cycle

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