Radiation Effect on Heat Transfer in Narrow Cavities

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...

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Bibliographic Details
Published in:Energies (Basel) 2023-05, Vol.16 (11), p.4259
Main Authors: Zhou, Wen-He, Sun, Lei, Li, Si-Si, Wu, Jian-Yun
Format: Article
Language:English
Subjects:
Air conditioning
Aluminum
Aluminum foil
Analysis
Cavities
Data acquisition systems
Energy consumption
Equilibrium
equivalent heat transfer coefficient
Experimental methods
Heat transfer
Holes
Humidity
Insulation
Mathematical models
Metal foils
narrow cavity
Numerical analysis
Numerical methods
Radiation
radiation heat transfer
Research methodology
Reynolds number
Temperature
Thermal resistance
thermal resistance enhancement
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16114259