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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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/11/4259 |
| _version_ | 1797597682334695424 |
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| author | Wen-He Zhou Lei Sun Si-Si Li Jian-Yun Wu |
| author_facet | Wen-He Zhou Lei Sun Si-Si Li Jian-Yun Wu |
| author_sort | Wen-He Zhou |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T03:09:01Z |
| format | Article |
| id | doaj.art-d6e1bdcf07b6403d94f79fbb0430ca31 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T03:09:01Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d6e1bdcf07b6403d94f79fbb0430ca312023-11-18T07:46:28ZengMDPI AGEnergies1996-10732023-05-011611425910.3390/en16114259Radiation Effect on Heat Transfer in Narrow CavitiesWen-He Zhou0Lei Sun1Si-Si Li2Jian-Yun Wu3School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaThe 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.https://www.mdpi.com/1996-1073/16/11/4259narrow cavitythermal resistance enhancementradiation heat transferequivalent heat transfer coefficient |
| spellingShingle | Wen-He Zhou Lei Sun Si-Si Li Jian-Yun Wu Radiation Effect on Heat Transfer in Narrow Cavities Energies narrow cavity thermal resistance enhancement radiation heat transfer equivalent heat transfer coefficient |
| title | Radiation Effect on Heat Transfer in Narrow Cavities |
| title_full | Radiation Effect on Heat Transfer in Narrow Cavities |
| title_fullStr | Radiation Effect on Heat Transfer in Narrow Cavities |
| title_full_unstemmed | Radiation Effect on Heat Transfer in Narrow Cavities |
| title_short | Radiation Effect on Heat Transfer in Narrow Cavities |
| title_sort | radiation effect on heat transfer in narrow cavities |
| topic | narrow cavity thermal resistance enhancement radiation heat transfer equivalent heat transfer coefficient |
| url | https://www.mdpi.com/1996-1073/16/11/4259 |
| work_keys_str_mv | AT wenhezhou radiationeffectonheattransferinnarrowcavities AT leisun radiationeffectonheattransferinnarrowcavities AT sisili radiationeffectonheattransferinnarrowcavities AT jianyunwu radiationeffectonheattransferinnarrowcavities |