Numerical Simulation Research On A Flat Plate Solar Air Collector With Baffles

Energy is the foundation for human to exist and develop. As one of the mostimportant renewable energy, the development and utilization of solar energy is animportant content in developing and utilizing new energy and renewable energy.There are great advantages to make full use of solar energy resources and optimizesolar energy equipment device. It can not only bring good social benefits andenvironmental benefits, but also brings great economic benefits. So this research hasgreat value.Solar air heat collector is an important form of solar energy utilization technology.But its heat conducting working medium is air, and it leads to the efficiency of heatcollection reduce. The key factors to break though the bottleneck lies in theimprovement of air convection heat transfer coefficient. In view of this, a flat platesolar air collector with baffles is designed. Due to the presence of the spoiler, the fluidflow process becomes more complicated, the turbulent kinetic energy is increased.Thereby, the air side heat convection coefficient is increased. The increase of bafflescan also increase flow path of fluid in the collector, and increase the dwell time of airin heating cavity as well to ensure the air is heated sufficiently. So the efficiency ofcollector is improved.In this paper, the method of numerical simulation is used to research the flat platesolar air collector with baffles. The theory of fluid mechanics and heat transfer theorywere based. The heat transfer, higher heat transfer and fluid mechanics theory werecombined to determine boundary conditions. The software of Fluent was used toresearch the efficiency law of the baffles of different angle, different spacing disturbedin air collectors. The heat transfer enhancement comprehensive evaluation parameterswere used to do comprehensive evaluation on12spoilers, and get optimized structure parameters of spoiler. The results show that the angle of45°, spacing of140mmspoiler air collector thermal performance is the best. The velocity of supplying windwas analyzed, and as well as the influence of thermal properties of solar irradiance onthe collector. The analysis showed that with the increasing of air velocity, the totalheat was taken away by air increased. However, when the air flow rate increased to acertain value, the total heat was taken away was almost constant. Toughcomprehensive considering of the factors efficiency of collector, exit temperature,power consumption and other factors, this paper deems that the optimum air velocityis3m/s left and right. The influence of solar radiation on the collector is not obvious,but the influence of heat collector outlet temperature is lager. Though analyzing innerflow field of the best spoiler air collector, found that the temperature of vortex area ishighest, and the temperature is higher40oC than others. It would increase the heat lossof the collector and affect the performance of heat collection. So the improvement onit is necessary. The comprehensive performance parameters of improved is increasedthan the original and the efficiency curve equation is...