期刊
SOLAR ENERGY
卷 133, 期 -, 页码 172-179出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2016.03.067
关键词
Retroreflective material; Diffuse reflective; Urban canyon; Urban heat island
资金
- National Natural Science Foundation of China [51508114, 41561015]
- Science Foundation of Guangxi [2015GXNSFBA139212]
Solar irradiance incident to an urban canyon with traditional diffuse reflective (DR) surfaces is subjected to multiple reflections, which increase the solar absorption of urban buildings and consequently contribute to the development of the unban heat island. Retroreflective (RR) materials direct the incident radiation back to its source and thus have the potential to reduce the heat intake of the urban surfaces. This study experimentally investigates the temperatures of the inner and outer walls of two small-scale building blocks with RR and DR surfaces, respectively. Two blocks stood side by side and were set at an experimental site such that both blocks were sunlit for a half day and were shaded for the other half day. It was found that the RR wall can keep the building blocks cooler than the DR wall during a sunny weather, and that the cooling effect is very small during a cloudy weather. The RR surface loses retro-reflectivity when the sunlight incident angle on the surface exceeds a certain angle (about 40 degrees). (C) 2016 Elsevier Ltd. All rights reserved.
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