Summary
The development process of solar photovoltaic heat pump system is reviewed. According to the research work of relevant scholars at home and abroad on photovoltaic heat pumps in recent years; This paper introduces the research progress of direct expansion and inter-expansion photovoltaic heat pumps, and points out that the implantation of injectors into the system instead of throttle valves can greatly reduce the throttling loss and improve the performance of the heat pump system.
keyword
Inter-expansion photovoltaic heat pumps, photovoltaic heat pump classification, injectors
conclusion
1) The application of photovoltaic heat pump system provides a new direction for the comprehensive utilization of energy, at present, there is little research on the expansion photovoltaic heat pump in China, and the technology is not very mature, so the optimization research on photovoltaic heat pump should be increased, and the application direction of photovoltaic solar thermal comprehensive utilization technology and heat pump technology should be broadened, so as to improve the photoelectric conversion efficiency and the comprehensive performance of heat pump.
2) Affected by latitude and longitude, the solar irradiance of each region is different, so the selection of refrigerants is different, because CO2 has high exhaust temperature and wide temperature slip characteristics and is an environmentally friendly refrigerant, so in the future, the refrigerant should be considered from the environmental point of view, and the research of CO2 refrigerant should be increased.
3) The high investment of inter-expansion photovoltaic heat pump is one of the main reasons limiting its development, and the use of injector instead of throttle valve can increase the suction pressure of the compressor, reduce the pressure ratio and improve the performance of the heat pump, so as to effectively save costs. In the future, the comprehensive efficiency and economic performance of photovoltaic heat pumps should be comprehensively considered, and the reliability of operation should be continuously improved, so as to provide a new direction for future development and user choice.
