Experimental research on solar phase change heat storage evaporative heat pump system

Abstract

With increase in global temperature, worsening of environmental conditions and a shortage of energy resources, countries around the world are actively developing the use of renewable energy sources. The technology of combining solar energy and heat pumps is an important direction for the development of new energy utilization technologies. In this paper, a solar phase change heat storage evaporative heat pump system (SPHP) is designed. The system uses a phase change heat storage tank as the connection center, and is coupled with a solar system and a heat pump system. The phase change heat storage tank is filled with ammonium aluminum sulfate dodecahydrate /stearic acid composite phase change heat storage material. The system was experimentally studied, and the analysis of a system simulation was performed using TRNSYS. The results show that the heating electricity consumption of the system is about 72.8% of that of a single heat pump, the daily operating cost is only 41.2% of that for a single heat pump heating system, the average system coefficient of performance (COP) reaches 3.79, the average heat collection efficiency of the solar collector can reach 59.8%, and the system solar energy proportion of heat supply is 27.2%. There was good agreement between the experimental and simulation results for the system COP and temperature of the heating end equipment.