Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel
An experimental system of an air-source heat pump with multiple outdoor units in parallel was designed and built. The outdoor units were defrosted in turn using hot subcooled liquid for defrosting. The heat pump heating performance variations in the course of frosting and defrosting under different...
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| Format: | Article |
| Language: | zho |
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Journal of Refrigeration Magazines Agency Co., Ltd.
2024-12-01
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| Series: | Zhileng xuebao |
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| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.12465/j.issn.0253-4339.2024.06.158 |
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| _version_ | 1849707447302750208 |
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| author | Niu Jianhui Liang Zheng Liu Fusheng Ma Guoyuan Feng Lianyuan |
| author_facet | Niu Jianhui Liang Zheng Liu Fusheng Ma Guoyuan Feng Lianyuan |
| author_sort | Niu Jianhui |
| collection | DOAJ |
| description | An experimental system of an air-source heat pump with multiple outdoor units in parallel was designed and built. The outdoor units were defrosted in turn using hot subcooled liquid for defrosting. The heat pump heating performance variations in the course of frosting and defrosting under different outdoor temperature and humidity conditions were experimentally studied, and the heating performances of the hot liquid subcooling alternate defrosting system and hot gas bypass alternate defrosting system were compared and analyzed. The experimental results show that the hot liquid subcooling alternate defrosting can enable the heat pump to complete the defrosting under the condition of continuous heating and that the defrosting performance is good. When the outdoor air temperature is -10 ℃ and the relative humidity is 90%, the optimal time to start defrosting is 30 min. At this time, the system heating capacity decreases from 9.87 kW when there is no frost to 8.71 kW when the defrosting starts, and the heating COP decreases from 3.73 to 3.36. When the system operates defrosting under different humidity conditions, the minimum values of system heating capacity and heating COP can reach 5.42 kW and 2.28, respectively. Compared to the case of bypassing 20% of discharge gas for defrosting, the average heating capacity of hot liquid subcooling alternate defrosting is 13.8% higher, and the heating COP<sub>C</sub> is 10.1% higher. |
| format | Article |
| id | doaj-art-e4f5b1052e124923a14bdc5c030f45b4 |
| institution | DOAJ |
| issn | 0253-4339 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Journal of Refrigeration Magazines Agency Co., Ltd. |
| record_format | Article |
| series | Zhileng xuebao |
| spelling | doaj-art-e4f5b1052e124923a14bdc5c030f45b42025-08-20T03:15:54ZzhoJournal of Refrigeration Magazines Agency Co., Ltd.Zhileng xuebao0253-43392024-12-014515816678553575Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in ParallelNiu JianhuiLiang ZhengLiu FushengMa GuoyuanFeng LianyuanAn experimental system of an air-source heat pump with multiple outdoor units in parallel was designed and built. The outdoor units were defrosted in turn using hot subcooled liquid for defrosting. The heat pump heating performance variations in the course of frosting and defrosting under different outdoor temperature and humidity conditions were experimentally studied, and the heating performances of the hot liquid subcooling alternate defrosting system and hot gas bypass alternate defrosting system were compared and analyzed. The experimental results show that the hot liquid subcooling alternate defrosting can enable the heat pump to complete the defrosting under the condition of continuous heating and that the defrosting performance is good. When the outdoor air temperature is -10 ℃ and the relative humidity is 90%, the optimal time to start defrosting is 30 min. At this time, the system heating capacity decreases from 9.87 kW when there is no frost to 8.71 kW when the defrosting starts, and the heating COP decreases from 3.73 to 3.36. When the system operates defrosting under different humidity conditions, the minimum values of system heating capacity and heating COP can reach 5.42 kW and 2.28, respectively. Compared to the case of bypassing 20% of discharge gas for defrosting, the average heating capacity of hot liquid subcooling alternate defrosting is 13.8% higher, and the heating COP<sub>C</sub> is 10.1% higher.http://www.zhilengxuebao.com/thesisDetails#10.12465/j.issn.0253-4339.2024.06.158air-source heat pumphot liquid defrostinghot gas defrostingheating performance |
| spellingShingle | Niu Jianhui Liang Zheng Liu Fusheng Ma Guoyuan Feng Lianyuan Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel Zhileng xuebao air-source heat pump hot liquid defrosting hot gas defrosting heating performance |
| title | Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel |
| title_full | Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel |
| title_fullStr | Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel |
| title_full_unstemmed | Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel |
| title_short | Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel |
| title_sort | experimental study on air source heat pump alternate defrosting with multiple outdoor units in parallel |
| topic | air-source heat pump hot liquid defrosting hot gas defrosting heating performance |
| url | http://www.zhilengxuebao.com/thesisDetails#10.12465/j.issn.0253-4339.2024.06.158 |
| work_keys_str_mv | AT niujianhui experimentalstudyonairsourceheatpumpalternatedefrostingwithmultipleoutdoorunitsinparallel AT liangzheng experimentalstudyonairsourceheatpumpalternatedefrostingwithmultipleoutdoorunitsinparallel AT liufusheng experimentalstudyonairsourceheatpumpalternatedefrostingwithmultipleoutdoorunitsinparallel AT maguoyuan experimentalstudyonairsourceheatpumpalternatedefrostingwithmultipleoutdoorunitsinparallel AT fenglianyuan experimentalstudyonairsourceheatpumpalternatedefrostingwithmultipleoutdoorunitsinparallel |