Prediction model of the radiation from ground surface to the occupant in outdoor space  

作　　者：RAN Mao-yu XUE Jia-wei 

机构地区：[1]Architecture College of Huaqiao University, Quanzhou 362021, China

出　　处：《Journal of Civil Engineering and Architecture》2009年第3期70-79,共10页土木工程与建筑（英文版）

基　　金：This study was supported by the Natural Science Foundation of Fujian Province of China （Nos. Do210013, 2006J0460）.

摘　　要：The outdoor ground radiation including the emitted radiation and reflected radiation plays an important role in the outdoor thermal environment. In this paper, based on the hypothesis of that the occupant body can be equivalent to a human cylinder and the outdoor ground surface is diffusive for radiation, a mathematical model is advanced to describe the radiation from the ground surface to the occupant. Through theoretical analysis of the mathematical model, general formulas for calculating the radiation arriving at the occupant from an annular ground surface and infinite ground surface are obtained. It shows that, the radiation from ground surface to the occupant depends on the surface temperature, reflectivity and emissivity, the arrange within the radius of 8.0m encircling the occupant can be defined as the dominant radiating area which radiates 90% radiation to the occupant. The radiative potentials of different pavement surface such grass, asphalt concrete surface, granite slab surface, terracotta bricks, colored concrete interlocking blocks are also compared with the datum measured by Tan Slew-Ann and Fwa Tien-Fang in Singapore, it shows that, in the summer sunny day, grass surface radiates more radiation in the morning but less in the afternoon than other pavement materials. Finally, discussions of reducing the radiation of outdoor ground surface are presented and main conclusions are drawn for improving the outdoor thermal environment.

关 键 词：outdoor ground radiation human cylinder outdoor thermal environment emitted radiation reflected radiation 

分 类 号：U491.61[交通运输工程—交通运输规划与管理] P422.62[交通运输工程—道路与铁道工程]