In order to research the enviromental influences on radiative reflection function of cool roof coatings，a three years field weathering test of the cool roof coatings in Beijing areawas implemented by checking the changes of coatings surface and measuring solar reflectanceand thermal emittance periodically. The results indicated a serious contamination on coatingssurface，which was the main factor reducing the solar reflectance. The higher the initial solarreflectance was，the more obvious reduction of reflectance occured. During 3 years，solar reflectance showed a periodical change along with seasons. Cleaning could delay the reductionof solar reflectance，especially for solvent based coatings. Thermal emittance increaced a littleand always maintained high values.
YANG Wen-Yi
,
LV Qiu-Rui
,
WANG Qiang-Qiang
,
LIN Chang-Qing
,
SUN Zhi
. Field Weathering Tests on Cool Roof Coatings[J]. Paint & Coatings Industry, 2019
, 49(5)
: 56
-62
.
DOI: 10.12020/j.issn.0253-4312.2019.5.56
[1]SLEIMAN M，BAN-WEISS G，GILBERT H E，et al.Soilingof building envelope surfaces and its effect on solarreflectance—Part I：Analysis of roofing product databases[J].Solar Energy Materials and Solar Cells, 2011, 95(12):3385-3399
[2] Cool Roof Rating Council，CRRC-1，Product rating program [S].Portland：CRRC，2015.
[3]林美.热反射涂料隔热机理及耐久性研究[J].中国建筑防水, 2014, (11):31-33
[4]韩立丹，陈炳跃，陈明毅等.耐候型反射隔热涂料的制备及性能[J].电镀与涂饰, 2017, 36(10):505-509
[5]杨文颐，乔亚玲，王强强等.冷屋面节能实效研究[J].中国建材科技, 2014, (1):14-17
[6] BERDAHL P，LEVINSON R，CHEN S.Measurement of solar reflectance，thermal emittance，color，and thickness[Z]. Lawrence Berkeley National Laboratory（LBNL），2015.
[7]LEVINSON R，BERDAHL P，BERHE A，et al.Effects of soiling and cleaning on the reflectance and solar heat gain ofa light-colored roofing membrane[J].Atmospheric Environment, 2005, 39(40):7807-7824
