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Harvesting solar thermal energy with a micro-gap thermionic-thermoelectric hybrid energy converter: Model development, energy exchange analysis, and performance optimization

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  • Rahman, Ehsanur
  • Nojeh, Alireza

Abstract

We present a comprehensive analysis of a dual, micro-gap thermionic-thermoelectric hybrid energy converter by developing a detailed theoretical model of the system. The space-charge and near-field effects in thermionic conversion and the temperature-dependent effects in thermoelectric conversion are considered while studying the energy flow through the cascade system. The temperatures and energy exchange channels in the different parts of the system are quantified using a self-consistent iterative algorithm considering the energy balance condition. The model is deployed to simulate the hybrid system performance when energized by a constant heat flux source which could, for example, be concentrated solar irradiance. The effect of solar radiation intensity on the combined system efficiency, and the dependence of the thermoelectric generator performance on the waste heat released from the thermionic top stage, are illustrated with several examples. Based on these analyses, a performance optimization of the hybrid system is carried out. The findings presented in this work offer useful insights into the hybrid generator operation. Moreover, the model developed can be used as a design tool for the practical implementation of such a hybrid system, or for extracting material- and device-related parameters from experimental data.

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  • Rahman, Ehsanur & Nojeh, Alireza, 2020. "Harvesting solar thermal energy with a micro-gap thermionic-thermoelectric hybrid energy converter: Model development, energy exchange analysis, and performance optimization," Energy, Elsevier, vol. 204(C).
    • Handle: RePEc:eee:energy:v:204:y:2020:i:c:s0360544220310549
    DOI: 10.1016/j.energy.2020.117947
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    References listed on IDEAS

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    1. Wang, Yuan & Su, Shanhe & Liu, Tie & Su, Guozhen & Chen, Jincan, 2015. "Performance evaluation and parametric optimum design of an updated thermionic-thermoelectric generator hybrid system," Energy, Elsevier, vol. 90(P2), pages 1575-1583.
    2. Hamid Elsheikh, Mohamed & Shnawah, Dhafer Abdulameer & Sabri, Mohd Faizul Mohd & Said, Suhana Binti Mohd & Haji Hassan, Masjuki & Ali Bashir, Mohamed Bashir & Mohamad, Mahazani, 2014. "A review on thermoelectric renewable energy: Principle parameters that affect their performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 337-355.
    3. Tsang, Eric W. K., 2014. "Old and New," Management and Organization Review, Cambridge University Press, vol. 10(03), pages 390-390, November.
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    Cited by:

    1. Jia Yu & Qingshan Zhu & Li Kong & Haoqing Wang & Hongji Zhu, 2020. "Modeling of an Integrated Thermoelectric Generation–Cooling System for Thermoelectric Cooler Waste Heat Recovery," Energies, MDPI, vol. 13(18), pages 1-10, September.
    2. Liang, Tao & Chen, Jingyi & Chen, Xiaohang & Su, Shanhe & Chen, Jincan, 2022. "Trade-off between the near-field heat transfer and the space charge effect in graphene-anode thermionic energy converters," Energy, Elsevier, vol. 260(C).
    3. Liang, Tao & Hu, Cong & Fu, Tong & Su, Shanhe & Chen, Jincan, 2022. "The maximum efficiency enhancement of a solar-driven graphene-anode thermionic converter realizing total photon reflection," Energy, Elsevier, vol. 239(PA).
    4. Shabani, Adib & Mehrpooya, Mehdi & Pazoki, Maryam, 2023. "Modelling and analysis of a novel production process of high-pressure hydrogen with CO2 separation using electrochemical compressor and LFR solar collector," Renewable Energy, Elsevier, vol. 210(C), pages 776-799.
    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. Aljaghtham, Mutabe & Celik, Emrah, 2022. "Design of cascade thermoelectric generation systems with improved thermal reliability," Energy, Elsevier, vol. 243(C).
    7. Mohammadnia, Ali & Ziapour, Behrooz M. & Sedaghati, Farzad & Rosendahl, Lasse & Rezania, Alireza, 2021. "Fan operating condition effect on performance of self- cooling thermoelectric generator system," Energy, Elsevier, vol. 224(C).

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