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Experimental Study on a Thermoelectric Generator for Industrial Waste Heat Recovery Based on a Hexagonal Heat Exchanger

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  • Rui Quan

    (Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China
    Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China)

  • Tao Li

    (Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China)

  • Yousheng Yue

    (Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China)

  • Yufang Chang

    (Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China)

  • Baohua Tan

    (School of Science, Hubei University of Technology, Wuhan 430068, China)

Abstract

To study on the thermoelectric power generation for industrial waste heat recovery applied in a hot-air blower, an experimental thermoelectric generator (TEG) bench with the hexagonal heat exchanger and commercially available Bi 2 Te 3 thermoelectric modules (TEMs) was established, and its performance was analyzed. The influences of several important influencing factors such as heat exchanger material, inlet gas temperature, backpressure, coolant temperature, clamping pressure and external load current on the output power and voltage of the TEG were comparatively tested. Experimental results show that the heat exchanger material, inlet gas temperature, clamping pressure and hot gas backpressure significantly affect the temperature distribution of the hexagonal heat exchanger, the brass hexagonal heat exchanger with lower backpressure and coolant temperature using ice water mixture enhance the temperature difference of TEMs and the overall output performance of TEG. Furthermore, compared with the flat-plate heat exchanger, the designed hexagonal heat exchanger has obvious advantages in temperature uniformity and low backpressure. When the maximum inlet gas temperature is 360 °C, the maximum hot side temperature of TEMs is 269.2 °C, the maximum clamping pressure of TEMs is 360 kg/m 2 , the generated maximum output power of TEG is approximately 11.5 W and the corresponding system efficiency is close to 1.0%. The meaningful results provide a good guide for the system optimization of low backpressure and temperature-uniform TEG, and especially demonstrate the promising potential of using brass hexagonal heat exchanger in the automotive exhaust heat recovery without degrading the original performance of internal combustion engine.

Suggested Citation

  • Rui Quan & Tao Li & Yousheng Yue & Yufang Chang & Baohua Tan, 2020. "Experimental Study on a Thermoelectric Generator for Industrial Waste Heat Recovery Based on a Hexagonal Heat Exchanger," Energies, MDPI, vol. 13(12), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3137-:d:372627
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    References listed on IDEAS

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    1. Kim, Yong Jun & Gu, Hyun Mo & Kim, Choong Sun & Choi, Hyeongdo & Lee, Gyusoup & Kim, Seongho & Yi, Kevin K. & Lee, Sang Gug & Cho, Byung Jin, 2018. "High-performance self-powered wireless sensor node driven by a flexible thermoelectric generator," Energy, Elsevier, vol. 162(C), pages 526-533.
    2. Meng, Fankai & Chen, Lingen & Feng, Yuanli & Xiong, Bing, 2017. "Thermoelectric generator for industrial gas phase waste heat recovery," Energy, Elsevier, vol. 135(C), pages 83-90.
    3. Fernández-Yáñez, P. & Armas, O. & Kiwan, R. & Stefanopoulou, A.G. & Boehman, A.L., 2018. "A thermoelectric generator in exhaust systems of spark-ignition and compression-ignition engines. A comparison with an electric turbo-generator," Applied Energy, Elsevier, vol. 229(C), pages 80-87.
    4. Fernández-Yañez, Pablo & Armas, Octavio & Capetillo, Azael & Martínez-Martínez, Simón, 2018. "Thermal analysis of a thermoelectric generator for light-duty diesel engines," Applied Energy, Elsevier, vol. 226(C), pages 690-702.
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    2. Björn Pfeiffelmann & Ali Cemal Benim & Franz Joos, 2021. "Water-Cooled Thermoelectric Generators for Improved Net Output Power: A Review," Energies, MDPI, vol. 14(24), pages 1-29, December.

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