Thermodynamic analysis of the heat regenerative cycle in porous medium engine

Liu, Huan; Xie, Maozhao; Wu, Dan

doi:10.1016/j.enconman.2008.09.023

Cited by 21 publications

(2 citation statements)

References 7 publications

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“…As one of the thermodynamic cycles, the PM cycle has constant volume processes in both endothermic and exothermic processes, similar to the Otto cycle. Liu et al [ 85 ] first applied FTT theory to investigate

and

of an endoreversible PM cycle. Ge et al [ 86 ] studied the

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of an irreversible PM cycle.…”

Section: Introductionmentioning

confidence: 99%

Four-Objective Optimization for an Irreversible Porous Medium Cycle with Linear Variation in Working Fluid’s Specific Heat

Zang

Chen

et al. 2022

Entropy

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Considering that the specific heat of the working fluid varies linearly with its temperature, this paper applies finite time thermodynamic theory and NSGA-II to conduct thermodynamic analysis and multi-objective optimization for irreversible porous medium cycle. The effects of working fluid’s variable-specific heat characteristics, heat transfer, friction and internal irreversibility losses on cycle power density and ecological function characteristics are analyzed. The relationship between power density and ecological function versus compression ratio or thermal efficiency are obtained. When operating in the circumstances of maximum power density, the thermal efficiency of the porous medium cycle engine is higher and its size is less than when operating in the circumstances of maximum power output, and it is also more efficient when operating in the circumstances of maximum ecological function. The four objectives of dimensionless power density, dimensionless power output, thermal efficiency and dimensionless ecological function are optimized simultaneously, and the Pareto front with a set of solutions is obtained. The best results are obtained in two-objective optimization, targeting power output and thermal efficiency, which indicates that the optimal results of the multi-objective are better than that of one-objective.

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and

of an endoreversible PM cycle. Ge et al [ 86 ] studied the

and

of an irreversible PM cycle.…”

Section: Introductionmentioning

confidence: 99%

Four-Objective Optimization for an Irreversible Porous Medium Cycle with Linear Variation in Working Fluid’s Specific Heat

Zang

Chen

et al. 2022

Entropy

View full text Add to dashboard Cite

show abstract

“…They assumed that the heat recovery cycle was completely ideal, so the exhaust heat from the cycle was fully recovered. It was also shown that the thermal efficiency of the engine with ideal recovery was less than that for an ideal Otto cycle but more than that for a diesel engine (for various compression ratios) [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Internal Combustion Engine Using Porous Foams for Thermal Energy Recovery

2016

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Homogeneous and complete combustion in internal combustion engines is advantageous. The use of a porous foam in the exhaust gas in an engine cylinder for heat recovery is examined here with the aim of reducing engine emissions. The internal combustion engine with a porous core regenerator is modeled using SOPHT software, which solved the differential equations for the thermal circuit in the engine. The engine thermal efficiency is observed to increase from 43% to 53% when the porous core regenerator is applied. Further, raising the compression ratio causes the peak pressure and thermal efficiency to increase, e.g., increasing the compression ratio from 13 to 15 causes the thermal efficiency and output work to increase from 53% to 55% and from 4.86 to 4.93 kJ, respectively. The regenerator can also be used as a catalytic converter for fine particles and some other emissions. The regenerator oxidizes unburned hydrocarbons. Meanwhile, heat recovered from the exhaust gases can reduce fuel consumption, further reducing pollutant emissions from the internal combustion engine.

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