Evaluation of the “white roof plan” for alleviating heat island effect
XU Fei1, ZHANG Xuehong1, LI Dong1, FENG Xiaoyu1,2
1. School of Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
In order to evaluate the white roof plan for quantitative alleviation of the urban heat island effect, the authors, adopting Shanghai as a study area and based on remote sensing, obtained the data of roof reflectance. By using Hottel model, the sun sunny hourly irradiance was simulated, and the city's rooftops in the absorption of solar radiation were employed to simulate the process under different values of reflectance. According to the "white roof plan", the authors estimated that the temperature of island intensity in the study area can reduce 1.32 ℃ during the lunch period in summer. In combination with the white roof heat transfer model, the authors also estimated that, in the house with white rooftop in summer, the air conditioning energy efficiency can be up to 12.60%.
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2014, Vol. 26 
