Research On Energy Storage And Release Characteristics Of Household Energy Storage Air Source Heat Pump

The heat performance of the air source heat pump system and building load are contrary to the changing law of the outdoor air temperature.It is an important key problem to be solved in the application process of air source heat pump.Particularly,the low temperature adaptability of the air source heat pump system has been an important constraint on the large-scale promotion of the air source heat pump system in the north of China.Therefore,improving the performance,stability and reliability of air source heat pump in cold and cold area has been attracting much attention.Phase change energy storage technology can well play the role of energy time transfer,and the technology combined with air source heat pump system can make up the shortage of heat supply under the low temperature environment of air source heat pump.It has great research value and application prospect.Combined with the weather conditions in cold and severe cold areas,the performance characteristics of air source heat pump and the law of building energy in China,a new type of household energy storage type air source heat pump system with capillary radiant heating as the end is put forward,and the reliability,performance and characteristics of the system are studied in this paper.The main contents of this paper are as follows:Through the study on the meteorological characteristics of cold and cold regions,two kinds of system forms of low-temperature heating charging air source heat pump with the water as PCM in heat exchanger as evaporator based on solar energy and medium-temperature heating charging air source heat pump with heat exchanger as condenser are put forward respectively,and their operation mode is studied.In order to verify the feasibility of the phase change energy source heat pump and carry out its performance and characteristics,a household energy storage type air source heat pump system was built,and the performance experiment of low-temperature heating charging air source heat pump on the evaporator side and medium-temperature heating charging air source heat pump on the condenser side were carried out respectively with water and paraffin.The key component of the household energy storage type air source heat pump system,fin-tube phase change thermal storage heat exchanger,is designed.The heat charging characteristics of the phase change heat exchanger and the unit in coupling operation are studied.It shows that the new phase change thermal storage heat exchanger has good heat transfer characteristics.When the heat storage is stored at low and medium temperature,the heat pump system can be coupled well with the air source heat pump system,and the performance of the air source heat pump can be improved significantly.Aim at low-temperature heating charging air source heat pump,The operation characteristics of the followed three operation modes are studied,which are the heat exchanger as evaporator for heating mode,the solar energy heating and Solar energy storage and air source heat pump heat at the same time mode.The research shows that the phase change thermal storage heat exchanger has good and stable charging and discharging characteristics.It can adopt the need of the low heat source of air source heat pump and has good performance.Aim at medium-temperature heating charging air source heat pump,The operation characteristics of the followed three operation modes are studied,which are the heat exchanger as condenser for heat charging mode,the separate heat exchanger for heating mode and the heat exchanger charging and discharging at the same time mode.The research shows that the PCM thermal storage heat exchanger has good and stable charging and discharging characteristics.It can meet the need of the condensation heat storage of air source heat pump and has good performance.In order to evaluate and control the performance of the system.And at the same COP of this system,the outdoor equivalent air temperature of the traditional heat pump is also studied.The research of this paper provides an important theoretical support for the promotion of air source heat pump in the cold and severe cold regions of China.It will provide technical reserves and support for the implementation of "coal to electricity" in northern China,and make contributes to building energy efficiency in China.