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Applied Thermal Engineering, 2017 Abstract To encourage a wider application of air source heat pumps (ASHPs) to colder areas due to the advantage of a higher energy efficiency, adopting cascade air source heat pumps (CASHPs) is a promising option. When CASHPs are operated in heating mode, frosting/defrosting has been problematic.
Shiming Simon Deng, Minglu Qu
exaly +4 more sources
Applied Thermal Engineering, 2021
Abstract Defrosting is an important issue that should be considered when an air source heat pump is operating in a cold climate. For the transcritical CO2 heat pump (TCHP) water heater, the high operating pressure affects the application of defrosting methods.
Zuliang Ye, Yulong Song, Yikai Wang
exaly +2 more sources
Abstract Defrosting is an important issue that should be considered when an air source heat pump is operating in a cold climate. For the transcritical CO2 heat pump (TCHP) water heater, the high operating pressure affects the application of defrosting methods.
Zuliang Ye, Yulong Song, Yikai Wang
exaly +2 more sources
International Journal of Refrigeration, 2004
Reverse-cycle defrosting technique is one of the simplest and most widely used defrosting methods for air source heat pumps (ASHP). However, there are still some problems if thermal expansive valve (TXV) is used as throttle regulator in the unit: the defrosting process might last so long that users would feel uncomfortable due to the fluctuation of the
Guoyuan Ma
exaly +3 more sources
Reverse-cycle defrosting technique is one of the simplest and most widely used defrosting methods for air source heat pumps (ASHP). However, there are still some problems if thermal expansive valve (TXV) is used as throttle regulator in the unit: the defrosting process might last so long that users would feel uncomfortable due to the fluctuation of the
Guoyuan Ma
exaly +3 more sources
Applied Thermal Engineering, 2021
Abstract The heating performance of air source transcritical carbon dioxide heat pump will be dramatically reduced with frost formation when operating in cold regions. Although reverse cycle defrosting is widely used, no information is available in the transcritical carbon dioxide system. In this paper, the reverse cycle defrosting was experimentally
Zuliang Ye, Yulong Song, Yikai Wang
exaly +2 more sources
Abstract The heating performance of air source transcritical carbon dioxide heat pump will be dramatically reduced with frost formation when operating in cold regions. Although reverse cycle defrosting is widely used, no information is available in the transcritical carbon dioxide system. In this paper, the reverse cycle defrosting was experimentally
Zuliang Ye, Yulong Song, Yikai Wang
exaly +2 more sources
Applied Energy, 2016
Reverse cycle defrosting is the most widely used standard defrosting method for air source heat pump (ASHP) units. It was suggested in previous experimental studies that downwards flowing of the melted frost over a vertical multi-circuit outdoor coil in an ASHP unit has negative effects on reverse cycle defrosting performance.
Mengjie Song, Shiming Simon Deng
exaly +2 more sources
Reverse cycle defrosting is the most widely used standard defrosting method for air source heat pump (ASHP) units. It was suggested in previous experimental studies that downwards flowing of the melted frost over a vertical multi-circuit outdoor coil in an ASHP unit has negative effects on reverse cycle defrosting performance.
Mengjie Song, Shiming Simon Deng
exaly +2 more sources
Applied Energy, 2009
Frost build-up blocks the gap between fins and decreases the airflow rate, and the heating capacity and COP of air-source heat pump become lower. The reverse-cycle defrosting (RCD) and hot-gas bypass defrosting HGBD are the two common methods of frost removal. The comparison between the RCD and HGBD methods on one heat pump were not found by authors up
Dong Huang, Quanxu Li, Xiuling Yuan
exaly +2 more sources
Frost build-up blocks the gap between fins and decreases the airflow rate, and the heating capacity and COP of air-source heat pump become lower. The reverse-cycle defrosting (RCD) and hot-gas bypass defrosting HGBD are the two common methods of frost removal. The comparison between the RCD and HGBD methods on one heat pump were not found by authors up
Dong Huang, Quanxu Li, Xiuling Yuan
exaly +2 more sources