Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger
Frosting is one of the main factors restricting the application of microchannel heat exchangers in refrigeration and air conditioning systems. Aiming at the frosting problem of a microchannel heat exchanger, the frosting mechanism was analyzed based on the phase transformation driving force, and the...
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| Format: | Article |
| Language: | zho |
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Journal of Refrigeration Magazines Agency Co., Ltd.
2021-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.01.089 |
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| author | Sheng Wei Fang Yongqiang Lan Qingyun Hao Xiaoru |
| author_facet | Sheng Wei Fang Yongqiang Lan Qingyun Hao Xiaoru |
| author_sort | Sheng Wei |
| collection | DOAJ |
| description | Frosting is one of the main factors restricting the application of microchannel heat exchangers in refrigeration and air conditioning systems. Aiming at the frosting problem of a microchannel heat exchanger, the frosting mechanism was analyzed based on the phase transformation driving force, and the growth morphology of the frost layer on the cold surface under different environmental factors was observed in this study. The effects of wet air temperature, humidity ratio, air velocity, and coolant temperature on the frosting characteristics, and the heat transfer performance of the microchannel heat exchanger were experimentally studied. The results show that the humidity ratio and air velocity of the wet air are the main factors affecting the frosting of the microchannel heat exchanger. At 15 min of frosting, the amount of frost on the heat exchanger surface under a humidity ratio of 5.75 g/(kg dry air) increased by 63.87% compared with a humidity ratio of 3.58 g/(kg dry air); the amount of frost on the heat exchanger surface under an air velocity of 2.5 m/s increased by 55.4% compared to the air velocity of 1 m/s. With the increase in frosting time, the lower the temperatures of the humid air and coolant, the greater the humidity ratio and air velocity are, and the more obvious the downward trend of the heat exchange capacity is. |
| format | Article |
| id | doaj-art-55256cea6cec4832906fa22d08cbd67f |
| institution | DOAJ |
| issn | 0253-4339 |
| language | zho |
| publishDate | 2021-01-01 |
| publisher | Journal of Refrigeration Magazines Agency Co., Ltd. |
| record_format | Article |
| series | Zhileng xuebao |
| spelling | doaj-art-55256cea6cec4832906fa22d08cbd67f2025-08-20T03:15:50ZzhoJournal of Refrigeration Magazines Agency Co., Ltd.Zhileng xuebao0253-43392021-01-0166505702Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat ExchangerSheng WeiFang YongqiangLan QingyunHao XiaoruFrosting is one of the main factors restricting the application of microchannel heat exchangers in refrigeration and air conditioning systems. Aiming at the frosting problem of a microchannel heat exchanger, the frosting mechanism was analyzed based on the phase transformation driving force, and the growth morphology of the frost layer on the cold surface under different environmental factors was observed in this study. The effects of wet air temperature, humidity ratio, air velocity, and coolant temperature on the frosting characteristics, and the heat transfer performance of the microchannel heat exchanger were experimentally studied. The results show that the humidity ratio and air velocity of the wet air are the main factors affecting the frosting of the microchannel heat exchanger. At 15 min of frosting, the amount of frost on the heat exchanger surface under a humidity ratio of 5.75 g/(kg dry air) increased by 63.87% compared with a humidity ratio of 3.58 g/(kg dry air); the amount of frost on the heat exchanger surface under an air velocity of 2.5 m/s increased by 55.4% compared to the air velocity of 1 m/s. With the increase in frosting time, the lower the temperatures of the humid air and coolant, the greater the humidity ratio and air velocity are, and the more obvious the downward trend of the heat exchange capacity is.http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.01.089frostheat exchangerphase transformation driving forceheat exchange capacitymorphology |
| spellingShingle | Sheng Wei Fang Yongqiang Lan Qingyun Hao Xiaoru Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger Zhileng xuebao frost heat exchanger phase transformation driving force heat exchange capacity morphology |
| title | Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger |
| title_full | Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger |
| title_fullStr | Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger |
| title_full_unstemmed | Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger |
| title_short | Experimental Research on Frosting Characteristics and Heat Transfer Performance of Microchannel Heat Exchanger |
| title_sort | experimental research on frosting characteristics and heat transfer performance of microchannel heat exchanger |
| topic | frost heat exchanger phase transformation driving force heat exchange capacity morphology |
| url | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.01.089 |
| work_keys_str_mv | AT shengwei experimentalresearchonfrostingcharacteristicsandheattransferperformanceofmicrochannelheatexchanger AT fangyongqiang experimentalresearchonfrostingcharacteristicsandheattransferperformanceofmicrochannelheatexchanger AT lanqingyun experimentalresearchonfrostingcharacteristicsandheattransferperformanceofmicrochannelheatexchanger AT haoxiaoru experimentalresearchonfrostingcharacteristicsandheattransferperformanceofmicrochannelheatexchanger |