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Heat Transfer Characteristics of Heat Exchangers for Waste Heat Recovery from a Billet Casting Process

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  • Ju O Kang

    (School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk 712-749, Korea)

  • Sung Chul Kim

    (School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk 712-749, Korea)

Abstract

The application of the thermoelectric generator (TEG) system to various industrial facilities has been explored to reduce greenhouse gas emissions and improve the efficiency of such industrial facilities. In this study, numerical analysis was conducted according to the types and geometry of heat exchangers and manufacture process conditions to recover waste heat from a billet casting process using the TEG system. The total heat absorption increased by up to 10.0% depending on the geometry of the heat exchanger. Under natural convection conditions, the total heat absorption increased by up to 45.5%. As the minimum temperature increased, the effective area increased by five times. When a copper heat exchanger of direct conduction type was used, the difference between the maximum and minimum temperatures was significantly reduced compared to when a stainless steel heat exchanger was used. This confirmed that the copper heat exchanger is more favorable for securing a uniform heat exchanger temperature. A prototype TEG system, including a thermosyphon heat exchanger, was installed and a maximum power of 8.0 W and power density of 740 W/m 2 was achieved at a hot side temperature of 130 °C. The results suggest the possibility of recovering waste heat from billet casting processes.

Suggested Citation

  • Ju O Kang & Sung Chul Kim, 2019. "Heat Transfer Characteristics of Heat Exchangers for Waste Heat Recovery from a Billet Casting Process," Energies, MDPI, vol. 12(14), pages 1-13, July.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2695-:d:248393
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    References listed on IDEAS

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    1. Saurabh Yadav & Jie Liu & Man Sik Kong & Young Gyoon Yoon & Sung Chul Kim, 2021. "Heat Transfer Characteristics of Thermoelectric Generator System for Waste Heat Recovery from a Billet Casting Process: Experimental and Numerical Analysis," Energies, MDPI, vol. 14(3), pages 1-18, January.

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