The Optical Properties of Black Coatings and Their Estimated Cooling Effect and Cooling Energy Savings Potential

Jie Qin¹, Jian Qu¹, Jianrong Song¹, Zhongnan , Song¹, Weidong Zhang^1*, Yunxing Shi¹, Tao Zhang¹, Xiao Xue², Rongpu Zhang¹, Hongqiang Zhang¹, Ziying Zhang¹, Xiong Wu¹

¹1Technical Center, China State Construction Engineering Co., Ltd., Beijing, China.
²2Department of Chemistry, Renmin University of China, Beijing, China.

DOI: 10.4236/jpee.2014.24011                

Abstract

The optical properties of coatings pigmented with different black colorants were systematically investigated and their surface temperatures and cooling energy savings were estimated. The black coatings pigmented with chromite iron nickel black and manganese ferrite black spinel colorants are not cool enough to be energy efficient cool black coatings. The cool black coatings pigmented with NIR-transmitting perylene black and dioxazine purple colorants possess a green shade and a violet shade, respectively. The estimated surface temperature reduction values and annual cooling energy savings in Beijing range from 3.0°C and 1.21 kWhm^-2yr^-1 for the black coating pigmented with chromite iron nickel colorant to 13.8°C and 5.52 kWhm^-2yr^-1 for the black coating pigmented with dioxazine purple colorant, respectively.

Keywords

Solar Reflectance; Thermal Emittance; Pigment; Black Coating; Cooling Effect; Cooling Energy Savings

Conflicts of Interest

The authors declare no conflicts of interest.

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