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Multi-objective optimization of a continuous thermally regenerative electrochemical cycle for waste heat recovery

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  • Long, Rui
  • Li, Baode
  • Liu, Zhichun
  • Liu, Wei

Abstract

An optimization analysis of a continuous TREC (thermally regenerative electrochemical cycle) was conducted with maximum power output and exergy efficiency as the objective functions simultaneously. For comparison, the power output, exergy efficiency, and thermal efficiency under the corresponding single-objective optimization schematics were also calculated. Under different optimization methods it was observed that the power output and the thermal efficiency increase with increasing inlet temperature of the heat source, whereas the exergy efficiency increases with increasing inlet temperature, reaches a maximum value, and then decreases. Results revealed that the optimal power output under the multi-objective optimization turned out to be slightly less than that obtained under the single-objective optimization for power output. However, the exergy and thermal efficiencies were much greater. Furthermore, the thermal exergy and exergy efficiency by single-objective optimization for energy efficiency shows no dominant advantage than that obtained under multi-objective optimization, comparing with the increase amplitude of the power output. This suggests that the multi-objective optimization could coordinate well both the power output and the exergy efficiency of the TREC system, and may serve as a more promising guide for operating and designing TREC systems.

Suggested Citation

  • Long, Rui & Li, Baode & Liu, Zhichun & Liu, Wei, 2015. "Multi-objective optimization of a continuous thermally regenerative electrochemical cycle for waste heat recovery," Energy, Elsevier, vol. 93(P1), pages 1022-1029.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:1022-1029
    DOI: 10.1016/j.energy.2015.09.098
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    Cited by:

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    5. Li, Ximei & Gao, Jianmin & Chen, Bingyuan & You, Shi & Zheng, Yi & Du, Qian & Qin, Yukun, 2023. "Multi-objective optimization of district heating systems with turbine-driving fans and pumps considering economic, exergic, and environmental aspects," Energy, Elsevier, vol. 277(C).
    6. Lai, Xiaotian & Long, Rui & Liu, Zhichun & Liu, Wei, 2018. "A hybrid system using direct contact membrane distillation for water production to harvest waste heat from the proton exchange membrane fuel cell," Energy, Elsevier, vol. 147(C), pages 578-586.
    7. Zhou, Junle & Chen, Lingen & Ding, Zemin & Sun, Fengrui, 2016. "Analysis and optimization with ecological objective function of irreversible single resonance energy selective electron heat engines," Energy, Elsevier, vol. 111(C), pages 306-312.
    8. Long, Rui & Lai, Xiaotian & Liu, Zhichun & Liu, Wei, 2019. "Pressure retarded osmosis: Operating in a compromise between power density and energy efficiency," Energy, Elsevier, vol. 172(C), pages 592-598.
    9. Long, Rui & Li, Baode & Liu, Zhichun & Liu, Wei, 2016. "Performance analysis of a dual loop thermally regenerative electrochemical cycle for waste heat recovery," Energy, Elsevier, vol. 107(C), pages 388-395.
    10. Long, Rui & Lai, Xiaotian & Liu, Zhichun & Liu, Wei, 2018. "Direct contact membrane distillation system for waste heat recovery: Modelling and multi-objective optimization," Energy, Elsevier, vol. 148(C), pages 1060-1068.
    11. Long, Rui & Li, Baode & Liu, Zhichun & Liu, Wei, 2018. "Reverse electrodialysis: Modelling and performance analysis based on multi-objective optimization," Energy, Elsevier, vol. 151(C), pages 1-10.
    12. Chen, Ruihua & Deng, Shuai & Xu, Weicong & Zhao, Li, 2020. "A graphic analysis method of electrochemical systems for low-grade heat harvesting from a perspective of thermodynamic cycles," Energy, Elsevier, vol. 191(C).

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