Performance of Diesel cycle with heat transfer, friction and variable specific heats of working fluid

Ge, Yanlin; Chen, L. G.; Sun, Fengrui; Chen, Wu

doi:10.1179/174602207x241941

Cited by 23 publications

(16 citation statements)

References 8 publications

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“…The tting curves resulting from the regression of the equations (4) and (5) can be seen in Figures 1 and 2. In the open literature, a method is used for getting certain solutions via temperature dependent speci c heat [38][39][40][41][42][43][44][45][46][47][48]. Because of speci c heats and , the isentropic coe cient = / is not constant and depends on temperature.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Modeling and optimization of maximum available work for irreversible gas power cycles with temperature dependent specific heat

Açıkkalp

Yamık

2015

Journal of Non-Equilibrium Thermodynamics

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In classical thermodynamics, the maximum power obtained from a system is de ned as exergy (availability). However, the term exergy is used for reversible cycles only; in reality, reversible cycles do not exist, and all systems are irreversible. Reversible cycles do not have such restrictions as time and dimension, and are assumed to work in an equilibrium state. The objective of this study is to obtain maximum available work for SI, CI and Brayton cycles while considering the aforementioned restrictions and assumptions. We assume that the speci c heat of the working uid varies with temperature, we de ne optimum compression ratios and pressure ratio in order to obtain maximum available work, and we discuss the results obtained. The design parameter most appropriate for the results obtained is presented.

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Section: Thermodynamic Analysismentioning

confidence: 99%

Modeling and optimization of maximum available work for irreversible gas power cycles with temperature dependent specific heat

Açıkkalp

Yamık

2015

Journal of Non-Equilibrium Thermodynamics

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“…Using the model of SH variation as a linear function of the temperature from [88], Refs. [96,[160][161][162][163] considered the influence of VSH on the cycle process, derived the power output and efficiency performance characteristics of an endoreversible Diesel cycle [96,160,163] and an irreversible Diesel cycle [96,161,162], and investigated the influences of VSH, HTL and FL on cycle performance. Considering HTL and using the VSH model established in [88,96,[160][161][162][163], Jeshvaghani et al [164] studied the work output and efficiency performance characteristics of an endoreversible Diesel cycle and investigated the influences of fuel types (including Diesel, biodiesel and B20) on cycle performance.…”

Section: The Progress In Optimum Performance Studies For As Diesel Cyclementioning

confidence: 99%

“…[96,[160][161][162][163] considered the influence of VSH on the cycle process, derived the power output and efficiency performance characteristics of an endoreversible Diesel cycle [96,160,163] and an irreversible Diesel cycle [96,161,162], and investigated the influences of VSH, HTL and FL on cycle performance. Considering HTL and using the VSH model established in [88,96,[160][161][162][163], Jeshvaghani et al [164] studied the work output and efficiency performance characteristics of an endoreversible Diesel cycle and investigated the influences of fuel types (including Diesel, biodiesel and B20) on cycle performance. Fixing the cycle maximum temperature and using the VSH model established in [88,96,[160][161][162][163][164], Zhao and Chen [165] studied the power output and efficiency performance characteristics of an irreversible Diesel cycle and examined the effects of VSH, HTL and IIL on cycle performance.…”

Section: The Progress In Optimum Performance Studies For As Diesel Cyclementioning

confidence: 99%

“…Considering HTL and using the VSH model established in [88,96,[160][161][162][163], Jeshvaghani et al [164] studied the work output and efficiency performance characteristics of an endoreversible Diesel cycle and investigated the influences of fuel types (including Diesel, biodiesel and B20) on cycle performance. Fixing the cycle maximum temperature and using the VSH model established in [88,96,[160][161][162][163][164], Zhao and Chen [165] studied the power output and efficiency performance characteristics of an irreversible Diesel cycle and examined the effects of VSH, HTL and IIL on cycle performance. Considering HTL, FL and IIL, He and Lin [166] established an irreversible Diesel cycle model when the SH of WF varied with the temperature as a linear function, derived the power output and efficiency performance characteristics, and investigated the influences of the three losses and VSH on cycle performance.…”

Section: The Progress In Optimum Performance Studies For As Diesel Cyclementioning

confidence: 99%

“…Considering HTL, FL and IIL and fixing the cycle maximum temperature, Ge [84] used the VSH model established in [88,96,[160][161][162][163][164][165][166], studied the optimum EF performance of an irreversible Diesel cycle, and analyzed the influences of the three losses and VSH on cycle EF performance.…”

Section: The Progress In Optimum Performance Studies For As Diesel Cyclementioning

confidence: 99%

See 2 more Smart Citations

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Chen

Sun

2016

Entropy

139

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Abstract:On the basis of introducing the origin and development of finite time thermodynamics (FTT), this paper reviews the progress in FTT optimization for internal combustion engine (ICE) cycles from the following four aspects: the studies on the optimum performances of air standard endoreversible (with only the irreversibility of heat resistance) and irreversible ICE cycles, including Otto, Diesel, Atkinson, Brayton, Dual, Miller, Porous Medium and Universal cycles with constant specific heats, variable specific heats, and variable specific ratio of the conventional and quantum working fluids (WFs); the studies on the optimum piston motion (OPM) trajectories of ICE cycles, including Otto and Diesel cycles with Newtonian and other heat transfer laws; the studies on the performance limits of ICE cycles with non-uniform WF with Newtonian and other heat transfer laws; as well as the studies on the performance simulation of ICE cycles. In the studies, the optimization objectives include work, power, power density, efficiency, entropy generation rate, ecological function, and so on. The further direction for the studies is explored.

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Aktuelle Trends in der Thermodynamik in endlicher Zeit

Andresen

2011

Angewandte Chemie

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Das Leitmotiv der Thermodynamik in endlicher Zeit (“finite‐time thermodynamics”) ist der Preis der Ungeduld und seine Minimierung. Reversible Prozesse können vollständig effizient sein, laufen jedoch meist unverhältnismäßig langsam ab. In allen Situationen – chemisch, mechanisch oder ökonomisch – sind wir bereit, mehr zu zahlen, damit eine Aufgabe schneller erledigt wird. Die Thermodynamik in endlicher Zeit befasst sich mit der Entwicklung von Methoden, diese Zusatzkosten zu begrenzen, wobei diese nicht zwingend monetär sein müssen, sondern sich auch auf Energieaufwand, Entropieproduktion oder dergleichen beziehen können. Die Thermodynamik in endlicher Zeit bietet Verfahren, den optimalen Pfad oder Betriebsmodus bei minimalem Zusatzaufwand zu berechnen. Ausgangspunkt ist es dabei, das System durch den Einfluss einer zeitlich variierenden Umgebung auf den optimalen Weg zu bringen; dies ist wie das Lenken eines Pferdes, das man einer Karotte an einem Stock nachlaufen lässt.

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Performance of Diesel cycle with heat transfer, friction and variable specific heats of working fluid

Cited by 23 publications

References 8 publications

Modeling and optimization of maximum available work for irreversible gas power cycles with temperature dependent specific heat

Modeling and optimization of maximum available work for irreversible gas power cycles with temperature dependent specific heat

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Aktuelle Trends in der Thermodynamik in endlicher Zeit

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