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An efficient strategy exploiting the waste heat in a solid oxide fuel cell system

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  • Wang, Yuan
  • Cai, Ling
  • Liu, Tie
  • Wang, Junyi
  • Chen, Jincan

Abstract

A novel model of the hybrid system consisting of a SOFC (solid oxide fuel cell) and a vacuum TIG (thermionic generator) is proposed so that the high temperature waste heat produced in the fuel cell can be efficiently exploited. Analytic expressions for the power outputs and efficiencies of the SOFC, TIG, and hybrid system are derived. The relation among the current density of the SOFC, the voltage output of the TIG, and the ratio of the areas of the SOFC and TIG is obtained by the energy balance equation. The influence of the current density of the SOFC on the power output density and efficiency is discussed for a given ratio of areas or voltage output. The maximum power output density and efficiency of the hybrid system are, respectively, equal to 0.560 W/cm2 and 0.284 and the efficiency of the hybrid system at the maximum power output density is 0.240. The optimal regions of the power output and efficiency of the hybrid system are determined. The advantages of the hybrid system are expounded, compared with the single SOFC.

Suggested Citation

  • Wang, Yuan & Cai, Ling & Liu, Tie & Wang, Junyi & Chen, Jincan, 2015. "An efficient strategy exploiting the waste heat in a solid oxide fuel cell system," Energy, Elsevier, vol. 93(P1), pages 900-907.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:900-907
    DOI: 10.1016/j.energy.2015.09.088
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    Cited by:

    1. Zhang, Xin & Cai, Ling & Liao, Tianjun & Zhou, Yinghui & Zhao, Yingru & Chen, Jincan, 2018. "Exploiting the waste heat from an alkaline fuel cell via electrochemical cycles," Energy, Elsevier, vol. 142(C), pages 983-990.
    2. Guo, Juncheng & Cai, Ling & Chen, Jincan & Zhou, Yinghui, 2016. "Performance evaluation and parametric choice criteria of a Brayton pumped thermal electricity storage system," Energy, Elsevier, vol. 113(C), pages 693-701.
    3. Xu, Haoran & Chen, Bin & Tan, Peng & Cai, Weizi & Wu, Yiyang & Zhang, Houcheng & Ni, Meng, 2018. "A feasible way to handle the heat management of direct carbon solid oxide fuel cells," Applied Energy, Elsevier, vol. 226(C), pages 881-890.
    4. Ramadhani, F. & Hussain, M.A. & Mokhlis, H. & Hajimolana, S., 2017. "Optimization strategies for Solid Oxide Fuel Cell (SOFC) application: A literature survey," Renewable and Sustainable Energy Reviews, Elsevier, vol. 76(C), pages 460-484.
    5. Han, Yuan & Zhang, Houcheng & Hu, Ziyang & Hou, Shujin, 2021. "An efficient hybrid system using a graphene-based cathode vacuum thermionic energy converter to harvest the waste heat from a molten hydroxide direct carbon fuel cell," Energy, Elsevier, vol. 223(C).
    6. Santhanam, S. & Schilt, C. & Turker, B. & Woudstra, T. & Aravind, P.V., 2016. "Thermodynamic modeling and evaluation of high efficiency heat pipe integrated biomass Gasifier–Solid Oxide Fuel Cells–Gas Turbine systems," Energy, Elsevier, vol. 109(C), pages 751-764.
    7. Zhang, Houcheng & Xu, Haoran & Chen, Bin & Dong, Feifei & Ni, Meng, 2017. "Two-stage thermoelectric generators for waste heat recovery from solid oxide fuel cells," Energy, Elsevier, vol. 132(C), pages 280-288.
    8. Guk, Erdogan & Kim, Jung-Sik & Ranaweera, Manoj & Venkatesan, Vijay & Jackson, Lisa, 2018. "In-situ monitoring of temperature distribution in operating solid oxide fuel cell cathode using proprietary sensory techniques versus commercial thermocouples," Applied Energy, Elsevier, vol. 230(C), pages 551-562.

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