Investigation and multi-objective optimization of vehicle engine-organic Rankine cycle (ORC) combined system in different driving conditions

Xu Ping, Fubin Yang, Hongguang Zhang, Chengda Xing, Mingzhe Yu and Yan Wang

Energy, 2023, vol. 263, issue PB

Abstract: Organic Rankine cycle (ORC) can improve the fuel efficiency of internal combustion (IC) engine. However, the dynamic characteristics of ORC system in driving conditions are not only affected by variable high-temperature waste heat source, but also have strong coupling correlation between operating parameters and performance. Under the superimposed influence, the performance of vehicle engine-ORC combined system has obvious nonlinearity and uncertainty. This paper first constructs a vehicle engine-ORC combined system model for the driving conditions. Based on different driving cycles, the combined system is verified. The influence of ORC system on engine performance in driving conditions is evaluated. The synergetic influence laws of operation parameters in driving conditions is systematically analyzed. Based on vehicle engine-ORC combined system for driving conditions model, simulation model with different coupling units and multi-objective optimization algorithm, this paper proposes an integrated multi-objective optimization framework of combined system with complex driving conditions. The real-time optimization of integrated system performance in driving conditions is realized. The trade-off and uncertainty correlation between combined system performance in driving conditions are analyzed. Finally, the improvement of IC engine performance by ORC system in driving conditions is quantitatively evaluated. The nonlinear optimization framework proposed in this paper can provide a practical solution for the analysis, evaluation and real-time optimization of vehicle engine-ORC combined system performance in driving conditions.

Keywords: Vehicle engine; Organic Rankine cycle; Driving cycles; Sensitivity analysis; Multi-objective optimization (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222025580

DOI: 10.1016/j.energy.2022.125672

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