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Thermoelectric performance optimization when considering engine power loss caused by back pressure applied to engine exhaust waste heat recovery

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  • He, Wei
  • Wang, Shixue

Abstract

A numerical model of a thermoelectric generator (TEG) is developed using the finite element method, and the convective heat-transfer coefficient and back pressure are calculated. The effect of the back pressure on the engine power loss is analyzed at different rotating speeds using GT-POWER simulation software. The optimal thermoelectric performance is analyzed considering the maximum net power output as the optimization objective. Results show that the net power output of the TEG can be considerably higher than the engine-power loss by optimizing the dimensions of the exhaust exchanger. When the rotating speed changes, the optimal height changes slightly; however, the optimal length and width change considerably. Considering the average values of the optimal length and width, the percentage deviation in the net power (approximately 4.2%) is the lowest for the following optimal dimensions: height = 0.005 m, length = 0.68 m, and width = 0.76 m. Further, a design height of less than 0.015 m also is acceptable if the corresponding optimal length and width are chosen, as a relatively high output power can be obtained with dev<10%. In brief, a high net power can be achieved by optimizing the design of the exhaust exchanger, regardless of the change in the rotating speed of the engine.

Suggested Citation

  • He, Wei & Wang, Shixue, 2017. "Thermoelectric performance optimization when considering engine power loss caused by back pressure applied to engine exhaust waste heat recovery," Energy, Elsevier, vol. 133(C), pages 584-592.
    • Handle: RePEc:eee:energy:v:133:y:2017:i:c:p:584-592
    DOI: 10.1016/j.energy.2017.05.133
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    Cited by:

    1. Luis Olmos-Villalba & Bernardo Herrera & Anderson Gallego & Karen Cacua, 2019. "Experimental Evaluation of a Diesel Cogeneration System for Producing Power and Drying Aromatic Herbs," Sustainability, MDPI, vol. 11(18), pages 1-12, September.
    2. Shu, Gequn & Ma, Xiaonan & Tian, Hua & Yang, Haoqi & Chen, Tianyu & Li, Xiaoya, 2018. "Configuration optimization of the segmented modules in an exhaust-based thermoelectric generator for engine waste heat recovery," Energy, Elsevier, vol. 160(C), pages 612-624.
    3. Huang, Bin & Shen, Zu-Guo, 2022. "Performance assessment of annular thermoelectric generators for automobile exhaust waste heat recovery," Energy, Elsevier, vol. 246(C).
    4. Ma, Zetai & Zhang, Kun & Xiang, Hanchun & Gu, Jie & Yang, Mingyang & Deng, Kangyao, 2023. "Experimental study on influence of high exhaust backpressure on diesel engine performance via energy and exergy analysis," Energy, Elsevier, vol. 263(PB).
    5. Pacheco, N. & Brito, F.P. & Vieira, R. & Martins, J. & Barbosa, H. & Goncalves, L.M., 2020. "Compact automotive thermoelectric generator with embedded heat pipes for thermal control," Energy, Elsevier, vol. 197(C).
    6. Ma, Zetai & Xie, Wenping & Xiang, Hanchun & Zhang, Kun & Yang, Mingyang & Deng, Kangyao, 2023. "Thermodynamic analysis of power recovery of marine diesel engine under high exhaust backpressure by additional electrically driven compressor," Energy, Elsevier, vol. 266(C).
    7. 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).
    8. Massaguer, E. & Massaguer, A. & Pujol, T. & Comamala, M. & Montoro, L. & Gonzalez, J.R., 2019. "Fuel economy analysis under a WLTP cycle on a mid-size vehicle equipped with a thermoelectric energy recovery system," Energy, Elsevier, vol. 179(C), pages 306-314.
    9. Lan, Song & Yang, Zhijia & Stobart, Richard & Chen, Rui, 2018. "Prediction of the fuel economy potential for a skutterudite thermoelectric generator in light-duty vehicle applications," Applied Energy, Elsevier, vol. 231(C), pages 68-79.
    10. Lan, Song & Li, Qingshan & Guo, Xin & Wang, Shukun & Chen, Rui, 2023. "Fuel saving potential analysis of bifunctional vehicular waste heat recovery system using thermoelectric generator and organic Rankine cycle," Energy, Elsevier, vol. 263(PB).
    11. Shen, Zu-Guo & Liu, Xun & Chen, Shuai & Wu, Shuang-Ying & Xiao, Lan & Chen, Zu-Xiang, 2018. "Theoretical analysis on a segmented annular thermoelectric generator," Energy, Elsevier, vol. 157(C), pages 297-313.
    12. Chen, Lingen & Lorenzini, Giulio, 2023. "Heating load, COP and exergetic efficiency optimizations for TEG-TEH combined thermoelectric device with Thomson effect and external heat transfer," Energy, Elsevier, vol. 270(C).
    13. Ma, Fangwu & Yang, Yu & Wang, Jiawei & Liu, Zhenze & Li, Jinhang & Nie, Jiahong & Shen, Yucheng & Wu, Liang, 2019. "Predictive energy-saving optimization based on nonlinear model predictive control for cooperative connected vehicles platoon with V2V communication," Energy, Elsevier, vol. 189(C).
    14. Kim, Tae Young & Kim, Junghwan, 2018. "Assessment of the energy recovery potential of a thermoelectric generator system for passenger vehicles under various drive cycles," Energy, Elsevier, vol. 143(C), pages 363-371.
    15. Lan, Song & Stobart, Richard & Wang, Xiaonan, 2022. "Matching and optimization for a thermoelectric generator applied in an extended-range electric vehicle for waste heat recovery," Applied Energy, Elsevier, vol. 313(C).
    16. Zhao, Yulong & Lu, Mingjie & Li, Yanzhe & Wang, Yulin & Ge, Minghui, 2023. "Numerical investigation of an exhaust thermoelectric generator with a perforated plate," Energy, Elsevier, vol. 263(PB).

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