Research On Daylighting Of University Gymnasium In Shijiazhuang Area Under Visual Comfort

As an important place for college students’ sports,the demand of university gymnasiums is gradually increasing at present,but most of the existing stadiums do not meet the lighting standard,low natural lighting utilization rate and poor visual comfort.According to domestic and foreign literature,the reasonable natural lighting design of university gymnasium can not only improve the quality of indoor light environment,but also improve the visual comfort of users.Therefore,this thesis takes the university gymnasium in Shijiazhuang area as the research object,combined with the multi-objective optimization theory,and proposes the lighting optimization scheme of the existing gymnasium in this area.Its function not only enriches the theoretical research of university gymnasium,but also provides a reference for the gymnasium architectural design in the future.First of all,the thesis conducts a field survey on the lighting environment of university gymnasiums in Shijiazhuang,and analyzes the spatial parameters,lighting quality and visual comfort illumination of university gymnasiums in this area.Through the actual measurement of the natural light environment in the competition hall,the current situation of lighting in the stadium is summarized,and the main factors affecting lighting are the design of lighting entrance,including lighting form,lighting mouth area,lighting orientation,glass material and location of lighting entrance.Through the evaluation method of visual comfort,the study of suitable visual comfort illumination threshold under the factor analysis,and the model of visual comfort illumination is established combined with Weber —— Feicler’s law: S is visual comfort,and E is horizontal illumination.S＝-527.4144+390.6024×(lnE)-109.1014×(lnE)~2+13×(lnE)~3-0.6434×(lnE)~4 is visual comfort,and E is horizontal illumination.So the optimal visual comfort illumination threshold is 580 lx and the threshold range is 300 lx —— 890 lx.Secondly,the thesis summarized the typical lighting model of Shijiazhuang Gymnasium,and simulated each influencing factor of the model respectively,and summarized the influence trend of the univariate change of the typical model on DA300 lx,UDI100-2000 lx and a DGP(0.4).Finally,the thesis through the typical model of daylighting mouth design of four influencing factors(window wall,window,glass transmission ratio and lighting towards)more target optimization,select the appropriate Pareto optimal solution set,according to the "visual comfortable illumination threshold" screening again,"lighting efficiency side + top collaborative lighting> side daylighting>top of the daylighting" conclusion.The optimal scheme for side + roof collaborative lighting is:(1)side window wall ratio 0.1,skylight window ratio 0.05,low-E hollow glass(medium light transmission),south lighting;(2)side window wall ratio 0.1,skylight window ratio 0.1,colored hollow glass,10 south by east.The sub-optimal scheme is:(1)side window wall ratio 0.05,skylight window ratio 0.1,low-E hollow glass(low light transmittance),10 south by east;(2)side window wall ratio 0.05,skylight window ratio 0.15,ordinary glass,60 south by east.The optimal scheme for side lighting is as follows:(1)side window wall ratio 0.2,colored hollow glass,30 south by east;(2)side window wall ratio 0.1,ordinary hollow glass,50 south by east.The sub-optimal scheme is:(1)side window-wall ratio 0.2,low-E hollow glass(medium light transmission),20 south by east;(2)side window-wall ratio 0.3,colored hollow glass,20 south by east.The optimal lighting scheme at the top is: a window ratio of 0.1,low-E hollow glass(low light transmittance),50 south by east.The visual comfort threshold and the lighting model of the university gymnasium in Shijiazhuang is conducive to guiding the lighting transformation of the gymnasium in the existing light-climate area,and also has certain theoretical value for the lighting design of the future gymnasium building scheme.