Research On The Transmitted Characteristics Of Solar Radiation And Its Distribution Law On Interior Surfaces

Solar radiation is important to the building energy conservation,but most of the existing researchers start from the macro perspective and rarely discuss the distribution characteristics of the transmitted solar radiation on interior surfaces.Therefore,it is impossible to accurately describe the change of temperature on indoor walls and the influence mechanism of solar radiation on the building thermal environment.Combining theoretical analysis,experimental test,and numerical simulation,this paper comprehensively analyzes the transmission of the solar radiation from outdoors to indoor walls,and establishes a complete research system,as follows:In this study,the radiation transmission of commonly used glass in buildings in the real environment is firstly tested,the change characteristics of the transmittance with solar incidence are analyzed from the global solar radiation and spectral angles respectively,and the relevant empirical models(GT 1 – GT 2)are established,and the concept of spectral effective transmittance is proposed.The empirical models GSET 1– GSET 2 with spectral range of 300 nm – 1100 nm is established.The results show that the transmission law presented by the new algorithm is consistent with the experimental results.Secondly,the global solar radiation,beam solar radiation,and diffuse radiation are measured respectively,and the indoor normal beam solar radiation is introduced.The separation law of indoor global solar radiation in sunny,partially cloudy and cloudy days is studied and the corresponding models are established.Thirdly,using the test platform,the transmitted solar radiation of each interior surface under different weather types is recorded,and the visual processing is made to reveal the distribution law of indoor solar radiation.Finally,according to the experimental data,the hourly and time-divided distribution models of transmitted diffuse radiation on interior surfaces are established,which is using the method of normalization and regression analysis.Furthermore,the statistical indicators and measured data are used to analyze the precision and genesis of distribution models.The study shows that the new distribution models of transmitted diffuse radiation are more consistent with the actual situation,and the time-divided distribution models are more applicable in engineering.In conclusion,this research will provide the theoretical basis and technical support for indoor thermal environment adjustment,partition heating,partition cooling,and building energy conservation under the influence of solar radiation.