Defrosting Characteristics of Refrigeration, Heating, and Hot Water Combined Air-conditioning System
Frost on the surface of an outdoor heat exchanger will seriously affect the operating performance and safety factor of a refrigeration-, heating-, and hot-water combined air-conditioning system when it is operating in winter. According to the defrosting strategy of the system, the influence of diffe...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2020-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2020.06.055 |
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| Summary: | Frost on the surface of an outdoor heat exchanger will seriously affect the operating performance and safety factor of a refrigeration-, heating-, and hot-water combined air-conditioning system when it is operating in winter. According to the defrosting strategy of the system, the influence of different defrosting temperature sensor positions on the defrosting characteristics of the unit is explored by carrying out experimental research. The results show that when the position of the defrosting temperature sensor is located at measuring point 2 and measuring point 5 on the surface of the outdoor heat exchanger, the duration of the system fluctuation during the frosting process is 2280 s and 220 s, respectively. The defrosting time was 5 min and 12 min, respectively, when the defrosting temperature sensor was located at measuring point 2 and measuring point 5. In addition, the time during which the superheat degree of the system continued to be negative in this process was 185 s and 80 s, respectively. Considering the safety of the system, it is recommended that the defrosting temperature sensor be placed at measuring point 5. |
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| ISSN: | 0253-4339 |