A NOVEL DESIGN FOR HIGH-TEMPERATURE SOLAR SELECTIVE COATING
This paper reviews the most recent development in high-temperature solar selective absorbing coating, and presents a novel design of coating surface. Through fundamental research and computer simulation, a double anti-reflection layer surface for solar selective coating has been developed with better solar efficiency than that using single AR layer. The AR materials used in this research are combination of SiO2/Al2O3, SiO2/AlON or SiO2/CuO, depends on dielectric function of metal-ceramic materials of the sub-layer absorber. It significantly lowers the reflectance of solar coating surface in the visible region while has little impact on the reflection in the infrared region. The optical performance of this new design was optimized for Mo, W and Ru based cermets by applying computer program, Bruggeman effective medium theory was used to calculate dielectric function of the composite, where an optimization calculation yields a solar absorptance of 0.93~0.95, while normal emittance at temperature of 350℃ was controlled in the range of 0.03~0.05. 1. INTRODUCTION For a superb solar selective coating, it should have the properties of absorbing maximally at solar main irradiation region while minimally at the IR region avoiding large heat loss due to Kirchhoffs law. Thus, the selective surface combining perfect absorber at Visible-Near IR(0.3~ 2.5μm ) region and reflector at the IR region (λ>2.5) with a sharp reflectance cut-edge could meet this need.
Dawei Ding Weimin Cai
School of Environmental science and Engineering Shanghai Jiao Tong University Shanghai 200240, China
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）