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Experimental investigation of optimal location of flow straightener from the aspects of power output and pressure drop characteristics of a thermoelectric generator

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  • Negash, Assmelash A.
  • Choi, Young
  • Kim, Tae Young

Abstract

This study addresses the combined effects of the location and porosity of a flow straightener on the waste heat recovery performance of a thermoelectric generator (TEG). An exhaust gas channel was built for the flexible placement of a flow straightener with varying porosity in the range of 0.121–0.516 at five different locations. Customized thermoelectric modules were placed between the exhaust gas channel and two coolant channels for waste heat recovery. A diesel engine releases the exhaust gas flow into the exhaust gas channel of the TEG placed in the middle of the tail pipe. Experimental results showed that a TEG design in which a flow straightener is positioned near the inlet of the TEG needs to be avoided because of a low power output to pressure loss ratio. The net power output, energy conversion efficiency, and pressure drop characteristics were enhanced as the location of flow straightener moved rearward of the TEG. A friction factor correlation was also proposed for predicting pressure drop characteristics of TEGs equipped with a flow straightener to improve their practicality in industry and engineering fields.

Suggested Citation

  • Negash, Assmelash A. & Choi, Young & Kim, Tae Young, 2021. "Experimental investigation of optimal location of flow straightener from the aspects of power output and pressure drop characteristics of a thermoelectric generator," Energy, Elsevier, vol. 219(C).
    • Handle: RePEc:eee:energy:v:219:y:2021:i:c:s0360544220326724
    DOI: 10.1016/j.energy.2020.119565
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    References listed on IDEAS

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    1. Suter, C. & Jovanovic, Z.R. & Steinfeld, A., 2012. "A 1kWe thermoelectric stack for geothermal power generation – Modeling and geometrical optimization," Applied Energy, Elsevier, vol. 99(C), pages 379-385.
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    Cited by:

    1. Fatih Selimefendigil & Damla Okulu & Hakan F. Öztop, 2023. "Photovoltaic Thermal Management by Combined Utilization of Thermoelectric Generator and Power-Law-Nanofluid-Assisted Cooling Channel," Sustainability, MDPI, vol. 15(6), pages 1-29, March.
    2. Huang, Bin & Shen, Zu-Guo, 2022. "Performance assessment of annular thermoelectric generators for automobile exhaust waste heat recovery," Energy, Elsevier, vol. 246(C).
    3. Yang, Wenlong & Zhu, WenChao & Du, Banghua & Wang, Han & Xu, Lamei & Xie, Changjun & Shi, Ying, 2023. "Power generation of annular thermoelectric generator with silicone polymer thermal conductive oil applied in automotive waste heat recovery," Energy, Elsevier, vol. 282(C).
    4. Ge, Minghui & Li, Zhenhua & Zhao, Yuntong & Xuan, Zhiwei & Li, Yanzhe & Zhao, Yulong, 2022. "Experimental study of thermoelectric generator with different numbers of modules for waste heat recovery," Applied Energy, Elsevier, vol. 322(C).
    5. Zou, Wen-Jiang & Shen, Kun-Yang & Jung, Seunghun & Kim, Young-Bae, 2021. "Application of thermoelectric devices in performance optimization of a domestic PEMFC-based CHP system," Energy, Elsevier, vol. 229(C).
    6. Tae Young Kim, 2021. "Prediction of System-Level Energy Harvesting Characteristics of a Thermoelectric Generator Operating in a Diesel Engine Using Artificial Neural Networks," Energies, MDPI, vol. 14(9), pages 1-14, April.
    7. 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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