Study On Coupling And Optimization Of Solar Water Heating System And Auxiliary Energ

Solar water heating systems have improved the instability by coupling with auxiliary energy.However,at present,there are few researches for this system,resulting in the reducing of the thermal efficiency of solar energy and waste of conventional energy.In order to solve these situations the following research was made.Based on the theory of volumetric heating of auxiliary energy,and analyzing the temperature distribution in the storage tank of solar water heating system under the condition of continuous rainy weather,a mathematical model of auxiliary energy heating capacity was obtained.According to the simulation of solar water heating system combined with auxiliary energy by CFD,the change of temperature in the storage tank and its impact on the efficiency of solar collectors was analyzed.The proper position of the auxiliary energy circulating pipes on the storage tank was obtained.It provided a theoretical basis for engineering design and optimization.According to China’s three typical regional climatic conditions and their thermal energy prices,the energy efficiency,economic and environmental benefit of three different systems such as the solar water heating systems with electric auxiliary heating,gas heating assistance and heat pump,were calculated and compared.It has a conclusion that the solar water heating system with heat pump as its auxiliary energy had obvious advantages.Local environment,climate conditions and energy prices should be taken into consideration when to choose the auxiliary energy of solar water heating systems.