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Thermodynamic analysis and parametric optimization of a novel S–CO2 power cycle for the waste heat recovery of internal combustion engines

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  • Zhang, Ruiyuan
  • Su, Wen
  • Lin, Xinxing
  • Zhou, Naijun
  • Zhao, Li

Abstract

With the aim to recover the exhaust heat of internal combustion engine efficiently, a novel supercritical CO2 (S–CO2) power cycle is proposed on the basis of recompression cycle configuration. The corresponding thermodynamic models are established to analyze the energetic and exergetic performances of the system. The effects of turbine inlet temperatures and system pressures are investigated. Thereafter, in order to output the maximum net work, genetic algorithm (GA) is employed to optimize these key parameters. Under design conditions, the calculated results indicate that the thermal efficiency and the exergy efficiency of the system can reach up to 35.86% and 67.90% respectively. Furthermore, as the inlet temperature of high pressure turbine increases, cycle efficiency increases while output work decreases. However, for the effect of inlet temperature of low pressure turbine, cycle efficiency and output work increase with the increase of temperature. As for the intermediate pressure of this system, there exist pressures to get the maximum net work and cycle efficiency. Based on GA optimization, an optimal combination of system parameters is obtained. The corresponding maximum cycle power is 39.49 kW, and the recovery efficiency of waste heat can reach up to 74.83%.

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  • Zhang, Ruiyuan & Su, Wen & Lin, Xinxing & Zhou, Naijun & Zhao, Li, 2020. "Thermodynamic analysis and parametric optimization of a novel S–CO2 power cycle for the waste heat recovery of internal combustion engines," Energy, Elsevier, vol. 209(C).
    • Handle: RePEc:eee:energy:v:209:y:2020:i:c:s0360544220315929
    DOI: 10.1016/j.energy.2020.118484
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    Cited by:

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    5. Xinxing Lin & Chonghui Chen & Aofang Yu & Likun Yin & Wen Su, 2021. "Performance Comparison of Advanced Transcritical Power Cycles with High-Temperature Working Fluids for the Engine Waste Heat Recovery," Energies, MDPI, vol. 14(18), pages 1-32, September.
    6. Wang, Zhe & Jiang, Yuemao & Ma, Yue & Han, Fenghui & Ji, Yulong & Cai, Wenjian, 2022. "A partial heating supercritical CO2 nested transcritical CO2 cascade power cycle for marine engine waste heat recovery: Thermodynamic, economic, and footprint analysis," Energy, Elsevier, vol. 261(PA).
    7. Mao, Yi & Zhang, Lei & Wan, Li & Stanford, Russell J., 2022. "Proposal and assessment of a novel power and freshwater production system for the heat recovery of diesel engine," Energy, Elsevier, vol. 240(C).
    8. Zhao, Dongpeng & Han, Changho & Cho, Wonhee & Zhao, Li & Kim, Yongchan, 2022. "Directly combining a power cycle and refrigeration cycle: Method and case study," Energy, Elsevier, vol. 259(C).
    9. Li, Ligeng & Tian, Hua & Shi, Lingfeng & Zhang, Yonghao & Huang, Guangdai & Zhang, Hongfei & Wang, Xuan & Shu, Gequn, 2022. "Experimental investigation of a splitting CO2 transcritical power cycle in engine waste heat recovery," Energy, Elsevier, vol. 244(PB).
    10. Tang, Junrong & Li, Qibin & Wang, Shukun & Yu, Haoshui, 2023. "Thermo-economic optimization and comparative analysis of different organic flash cycles for the supercritical CO2 recompression Brayton cycle waste heat recovery," Energy, Elsevier, vol. 278(PB).
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