| External windows are the research focus in the field of building energy conservation,the heat of solar radiation entering the room through the outside window is the primary cause of the deterioration of the indoor thermal environment.The performance of building shading and external window glass is two factors that have a great impact on indoor solar radiation,and the performance will have a certain impact on each other.Foreign scholars have proposed that the combination of external window glass and shading equipment plays a crucial role in providing the overall comfort of office space and requires comprehensive assessment.However,there are few researches on the comprehensive effect and design strategies of building shading and window glass in China.It mainly focuses on the separate effect analysis,and the quantitative analysis based on the experimental test is more deficient.Firstly,based on the theoretical basis of building physics,building environment and building thermal process,this paper calculates and analyzes the difference between the optothermal effects of different window glasses.It is found that in Chongqing area,ordinary hollow glass,single silver Low-E hollow glass and double silver Low-E hollow glass has little difference in lighting effect.The thermal insulation of Low-E hollow glass is much better than that of ordinary hollow glass,and the total heat of the window is significantly reduced.The thermal insulation of double silver Low-E hollow glass and single silver Low-E hollow glass is almost the same,the heat transfer coefficient is improved by about 10%,but double silver Low-E hollow glass has a lower coefficient of solar heat gain,so the total heat of the window glass is still significantly reduced.In order to study the influence of different forms of external shading and window glass on the indoor environment,a model test platform for building external shading and window glass was built.In the summer sunny days,the indoor solar radiation intensity,illuminance,and temperature of different forms of external shading(no shading,horizontal shading,vertical shading,blind shading)and window glass(ordinary hollow glass,single silver Low-E hollow glass and double silver Low-E hollow glass)in southeast,south,and southwest buildings were tested,and the effects on the indoor solar radiation and the light and heat environment were analyzed.In order to study the influence of different forms of external shading and window glass on building energy consumption,Energy Plus simulation software was used to analyze the indoor air-conditioning energy consumption,heating energy consumption and lighting energy consumption of the different external shading and window glass in the southeast,south and southwest directions.Finally,based on the current situation of external shading and window glass in Chongqing,combined with the theoretical calculation and experimental test analysis of the effect of different external shading and window glass on the indoor environment,and energy consumption simulation and calculation,propose the comprehensive design strategy for building exterior shading and window glass in Chongqing area. |
