Study On Radiation Characteristics And Heat Flow Uniformity Of Solar Disk High Power Concentration System

Consumption of traditional energy sources and the fear of pollution are damaging the environment.Solar energy is gaining attention as a clean and free source of renewable energy.The solar parabolic vessel system makes heavy use of solar power due to its high power ratio and efficient light-to-heat conversion.As a primary tool for energy conversion,heat flux distribution and influencing factors of heat absorber are clarified.The method to improve the heat flux distribution uniformity is put forward,which is of great significance to ensure the safety and reliability of the heat absorber operation.This thesis takes up the photovoltaic management system as a researcher,investigates the method of heat dissipation in the space of the hot water chamber,and provides the method of optimizing the heat uniformity and heat flow.The main findings of this thesis are as follows:(1)Based on Sol Trace optical simulation software,a heat sink cavity cylinder model consisting of 16 rectangular vertical parts surrounding a circular upper wall has been established.The heat flux distribution in the cavity was simulated.The results show that the heat flux distribution along the axial direction in the cavity of the absorber is extremely uneven.The peak value appears in the middle of the heat absorber,and the lowest value is located at the opening of the heat absorber.In addition,the heat flux distribution along the circumferential direction of the absorber is relatively uniform.(2)Improved MCRT model generation.That is,the beam does not carry power.This method introduces the concept of heat transfer coefficient and separates physical quantities such as relative position,shape,and radiation surface characteristics between radiation units from temperature.Compared to Yan’s data,the simulation results for this model are in good agreement with the literature that validates the model’s reliability.This model describes the effects of the number of rays,heat sink opening position,and wall absorptivity on heat flux distribution.(3)Two methods are proposed to improve the uniformity of heat flux distribution.One is to improve the structure of the concentrator and the other is to improve the distribution of radiation characteristics on the cavity wall.The results show that the uniformity of heat flux distribution in the inner wall of the absorber can be significantly improved by optimizing the structure of the concentrator.The peak heat flow decreased from 810 k W/m2 to 531 k W/m2,and the non-uniform factor decreased from 2.5 to 0.25.In addition,the low heat flow zone was reduced from 90 mm to 45 mm.According to the influence of the radiative characteristics of the heat absorbing surface on the heat flux distribution,this thesis also proposes an optimization method of the absorption distribution.The results show that the optimal absorption distribution can effectively reduce the peak heat flow and reduce the non-uniform factor from 2.5 to 0.5.In this study,based on the achievement of the heat flow distribution properties of the solar heat,the non-uniformity is improved.The research content has an indicative significance for the scientific design,operational reliability and reliability of the heat sink.