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Radiation Effect on Heat Transfer in Narrow Cavities

Author

Listed:
  • Wen-He Zhou

    (School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education, Lanzhou 730070, China)

  • Lei Sun

    (School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education, Lanzhou 730070, China)

  • Si-Si Li

    (School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

  • Jian-Yun Wu

    (School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

Abstract

The thermal comfort and air-conditioning energy consumption of vehicles or trains are dependent on the thermal resistance of its envelopes, which could be enhanced by improving the radiation characteristics of the narrow cavities scattered in their envelopes. However, the study for a feasible method and its effectiveness has been given little attention. This paper introduces a method that involves pasting aluminum foil on the inner wall to change the radiation characteristics of the narrow cavity and analyzed its effects on narrow-cavity heat transfer by experimental and numerical methods. The results indicate that the radiation effect on heat transfer in a narrow cavity made of conventional material is dominant, with a rate larger than 75%, and that pasting aluminum foil is an effective and feasible method of weakening the radiation rate in narrow-cavity heat transfer, decreasing it to less than 10%. This paper will provide a reference to improve the insulation characteristics of vehicle enclosure.

Suggested Citation

  • Wen-He Zhou & Lei Sun & Si-Si Li & Jian-Yun Wu, 2023. "Radiation Effect on Heat Transfer in Narrow Cavities," Energies, MDPI, vol. 16(11), pages 1-12, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4259-:d:1153217
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    References listed on IDEAS

    as
    1. Mezrhab, A. & Bouali, H. & Amaoui, H. & Bouzidi, M., 2006. "Computation of combined natural-convection and radiation heat-transfer in a cavity having a square body at its center," Applied Energy, Elsevier, vol. 83(9), pages 1004-1023, September.
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