高密度城市区域动态采光分析.ppt

1、,Dynamic Analysis for Daylight Availability in High-Density Urban Area 高密度城市区域动态采光分析,杜 江 涛 Jiangtao Du (PhD student) Architecture School University of Sheffield,ABSTRACT This study describes a dynamic analysis method to investigate daylight availability in high-density urban area. In contrast to tra

2、ditional static concept based on Daylight Factor, this method introduces Daylight Coefficient and Perez sky luminance function, which can be used to dynamically analysize the annual daylight level profile. Daylight Coefficient on the outside surfaces of buildings has been calculated by DaySim, a pac

3、kage using Radiance algorithm. Also, Sky Luminance Distribution comes from annual solar gains through Perezs sky model function. Accordingly, integrating Daylight Coefficient and sky luminance distribution would get illuminace values across the outside surfaces. The annual illuminance profile of the

4、re surfaces is a significant indicator for daylight levels in buildings. Three typical built layouts in current high-density Chinese city have been modelled and simulated. The solar radiation data in the simulation are derived from the weather file (2005) of Beijing and Shanghai, which represent dif

5、ferent weather zones (II and III) in China and both have plenty of high-density lots. The proposed methodology can help urban and building designers evaluate the possibilities of using natural lighting in high-density area from the early conceptual design stages.,INTRODUCTION,High-density Urban Area

6、 important environmental issue: daylit spaces; building type: residential buildings; commercial buildings.,Natural Light Availability and Performance component: skylight and sunlight. benefit: reducing artificial light; saving energy; improve indoor qualities (psychology).,Daylight and Sunlight code

7、 in China 1,2 GB/T 50033-2001 Standard for daylighting design of buildings 建筑采光设计标准 GB 50180-93 (2002) Code of urban residential areas planning Easily adopted, but not corresponding to the real climate conditions and urban layout; Low practical feasibility and lacking flexibility.,Climate-based Dyna

8、mic model or method 3,METHODOLOGY,Climate-based Dynamic model - Daylight Coefficient and Perez sky model,Daylight Coefficient,145 patches,Peter Tregeza 4,5,5,6,Perez sky model 7, 8,R. Perez, R. Seals, J. Michalsky; All-weather model for sky luminance distribution preliminary configuration and valida

9、tion Solar Energy 50 3 1993 235245. R. Perez, P. Ineichen, R. Seals, J. Michalsky, R. Stewart; Modeling daylight availability and irradiance components from direct and global irradiance Solar Energy 44 5 1990 271289.,Three ways to produce the luminance distribution of sky: Direct radiation, diffuse

10、radiation Global illminance, diffuse illuminance Coefficients setting: a,b,c,d,e,Sky luminance,DC,E,5,Climate-based Dynamic method for urban daylight availability analysis,Typical positions on the Vertical surface of building,Daylight Coefficient of reference positions,Weather data of test reference

11、 year (TRY),Annual illuminance profile (5 minutes, 10 minutes, 0.5 hour, 1 hour),9,Case analysis for daylight availability analysis in high-density urban area,1. Linear layout,2. Court layout,3. Dot layout,Higher position,Middle position,Lower position,Beijing: II 寒冷地区 III 光气候区 Shanghai: III 夏热冬冷地区

12、IV 光气候区,north,1, 2,RESULTS,Day: 20/01 (大寒） 20/03 (春分） 21/06 (夏至） 23/09 (秋分） 22/12 (冬至） Step: 1 hour,Beijing 1-20,3-20,Beijing,6-21,9-23,12-22,Shanghai 1-20,3-20,Shanghai,6-21,9-23,12-22,Beijing 1-20,Beijing,3-20,6-21,9-23,12-22,Shanghai 1-20,Shanghai,3-20,6-21,9-23,12-22,Beijing 1-20,Beijing,3-20,6-

13、21,9-23,12-22,Shanghai 1-20,Shanghai,3-20,6-21,9-23,12-22,CONCLUSIONS,A real dynamic method for daylight availability investigation; based on the weather data (radiation);,Illuminace output, easily to understand and compile;,Based on DC and Radiance algorithm (DaySim), suitable for complicated environment;,More knowledge needed when using the tool; long running time; thousands of data.,REFERENCES,1. GB/T 50033-2001 Standard for daylighting design of buil