Research And Application Of Optimal Design Of Solar Heating Systems

With the rapid growth of China’s total construction and improvement of the living environment, building energy consumption has increased rapidly. Building energy consumption accounts for about30percent of the total national energy consumption, thus exacerbating the supply of energy and lead to serious environmental pollution. As a renewable clean energy, to promote the use of solar heating technology in the building of great significance to the sustainable development of our country. But solar energy is intermittent and instability, as well as thermal energy storage problem, which makes the thermal use of solar energy has been largely restricted. The use of phase change material storage density high, small temperature fluctuations when the regenerative or exothermic properties, solar collector technology combined with phase change thermal storage technologies, to design a solar energy-phase change thermal storage coupled heating systems. The system both for the building to provide housing heating, and can provide users with hot water.First, describes the composition of the solar heating system.and the works under different conditions. And introduces the system components:solar collectors, phase change thermal storage device, auxiliary heat source, the heating ending and control system.Second, study on the fin strengthening heat exchanger of the phase change thermal storage. Use the FLUENT software to simulate the thermal storage unit. Analyzed rib strengthen the regenerative properties of phase change thermal storage unit of the heat storage unit tube spacing, rib spacing, rib pitch and the ratio of1/2pitch, the thickness of the ribs, the heat transfer fluid flow rate and changes in temperature.Third, analysis methods to improve the run effect of the solar heating system. Summarizes the optimal design of solar collectors of the optimum tilted angle and optimum area. Analyzed the determination method of the heat storage capacity of the accumulator, and the influence of the factors of the solar guaranteed rate and the method of improve thermal utilization ratio.Lastly, the solar heating system designed in a building in Shijiazhuang region. Assess the economic benefits and social benefits of the system, and conduct a feasibility analysis of programs, then provided a basis for the promotion and application of solar heating technology.