Radiation Effect on Heat Transfer in Narrow Cavities

Wen-He Zhou (), Lei Sun, Si-Si Li and Jian-Yun Wu
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Wen-He Zhou: School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Lei Sun: School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, 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

Energies, 2023, vol. 16, issue 11, 1-12

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.

Keywords: narrow cavity; thermal resistance enhancement; radiation heat transfer; equivalent heat transfer coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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