Abstract
Air source heat pump has the characteristics of high efficiency, energy saving, green and pollution-free, and has been widely used in building energy saving projects. However, the frosting phenomenon of the air source heat pump evaporator during the heating operation in cold areas in winter will reduce the heat production of the system, affect the comfort experience, and even cause the system down or irreversible damage to the heat pump system when the frosting is serious. This paper summarizes the research of domestic and foreign scholars on air source heat pump defrosting, analyzes the existing problems of defrosting technology, and finally looks forward to the future development trend of air source heat pump defrosting research.
Highlights
Air source heat pump has the characteristics of high efficiency, energy saving, dual use of cooling and heating, etc, and it is widely used in the fields of heating and air conditioning[1]
It is of great significance to take appropriate methods for periodic defrosting of outdoor heat exchangers to ensure that the air source heat pump still has good operating efficiency in low temperature areas and to popularize the air source heat pump technology
In order to improve the adaptability of air source heat pump in low temperature area, the researchers have done a lot of research on heat pump defrosting
Summary
Air source heat pump has the characteristics of high efficiency, energy saving, dual use of cooling and heating, etc, and it is widely used in the fields of heating and air conditioning[1]. At the same time, frosting makes the air flow resistance between the heat exchange fins increase, greatly reducing the heat pump heating power and heating coefficient. It will increase the energy consumption of the fan, leading to further deterioration of the operating condition of the air source heat pump, and serious accidents will occur. It is of great significance to take appropriate methods for periodic defrosting of outdoor heat exchangers to ensure that the air source heat pump still has good operating efficiency in low temperature areas and to popularize the air source heat pump technology
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