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Simulation of thermoelectric-hydraulic performance of a thermoelectric power generator with longitudinal vortex generators

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  • Ma, Ting
  • Pandit, Jaideep
  • Ekkad, Srinath V.
  • Huxtable, Scott T.
  • Wang, Qiuwang

Abstract

This work investigates the feasibility of using LVGs (longitudinal vortex generators) to improve heat transfer in TEG (thermoelectric generator) systems. A coupled fluid-thermal-electric model is established with COMSOL Multiphysics® to study the effects of LVG height, LVG attack angle, and hot-side inlet gas temperature. We find that LVGs can significantly enhance the heat transfer performance, power output, and thermal conversion efficiency due to the generated longitudinal vortices, especially at small LVG attack angles. The performance of the thermoelectric generators with LVGs is best for LVGs that span the full height of the channel at the highest temperature examined (550 K), where the heat input, net power and thermal conversion efficiency are enhanced by 29%–38%, 90%–104% and 31%–36%, respectively, compared to smooth flow channel. As the hot-side inlet gas temperature decreases, the pumping power remains constant and requires a larger portion of the power output since the heat input and power output are significantly reduced. Therefore, it is not beneficial to use tall LVGs at lower hot-side inlet temperatures and higher inlet Reynolds numbers due to the large ratio of pressure drop to power output, but smaller LVGs are still useful under these conditions.

Suggested Citation

  • Ma, Ting & Pandit, Jaideep & Ekkad, Srinath V. & Huxtable, Scott T. & Wang, Qiuwang, 2015. "Simulation of thermoelectric-hydraulic performance of a thermoelectric power generator with longitudinal vortex generators," Energy, Elsevier, vol. 84(C), pages 695-703.
    • Handle: RePEc:eee:energy:v:84:y:2015:i:c:p:695-703
    DOI: 10.1016/j.energy.2015.03.033
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    References listed on IDEAS

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    4. Liang, Xingyu & Sun, Xiuxiu & Tian, Hua & Shu, Gequn & Wang, Yuesen & Wang, Xu, 2014. "Comparison and parameter optimization of a two-stage thermoelectric generator using high temperature exhaust of internal combustion engine," Applied Energy, Elsevier, vol. 130(C), pages 190-199.
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    Cited by:

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    2. Wang, Yiping & Li, Shuai & Xie, Xu & Deng, Yadong & Liu, Xun & Su, Chuqi, 2018. "Performance evaluation of an automotive thermoelectric generator with inserted fins or dimpled-surface hot heat exchanger," Applied Energy, Elsevier, vol. 218(C), pages 391-401.
    3. Ma, Ting & Qu, Zuoming & Yu, Xingfei & Lu, Xing & Chen, Yitung & Wang, Qiuwang, 2019. "Numerical study and optimization of thermoelectric-hydraulic performance of a novel thermoelectric generator integrated recuperator," Energy, Elsevier, vol. 174(C), pages 1176-1187.
    4. Ma, Ting & Lu, Xing & Pandit, Jaideep & Ekkad, Srinath V. & Huxtable, Scott T. & Deshpande, Samruddhi & Wang, Qiu-wang, 2017. "Numerical study on thermoelectric–hydraulic performance of a thermoelectric power generator with a plate-fin heat exchanger with longitudinal vortex generators," Applied Energy, Elsevier, vol. 185(P2), pages 1343-1354.
    5. Twaha, Ssennoga & Zhu, Jie & Yan, Yuying & Li, Bo, 2016. "A comprehensive review of thermoelectric technology: Materials, applications, modelling and performance improvement," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 698-726.
    6. Shen, Zu-Guo & Wu, Shuang-Ying & Xiao, Lan & Yin, Gang, 2016. "Theoretical modeling of thermoelectric generator with particular emphasis on the effect of side surface heat transfer," Energy, Elsevier, vol. 95(C), pages 367-379.

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