基于粒子散射的太阳光谱选择性吸收涂层
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摘要
为研究金属陶瓷中金属粒子散射造成的选择性吸收,将通过Mie散射理论求出的辐射特性参数代入蒙特卡洛光线追迹算法中,模拟研究不同金属颗粒对选择性吸收的影响。以Al2O3为陶瓷相,以半径为10～200 nm的Cr、W颗粒为金属相的金属陶瓷。利用散射参数随金属颗粒尺寸的变化,通过不同金属颗粒大小的匹配设计一种双层结构的金属陶瓷涂层。模拟结果表明其太阳能吸收率大于95%,600℃下热辐射发射率为26%,400倍聚光条件下光热转换效率超过93%。
The effect of metal particles in cermet coatings on spectral selectivity is studied by Mie theory and Monte Carlo ray tracing algorithm. Cr and W particles with radius of 10-200 nm embedded in Al2 O3 are considered. 2-layer cermet coatings are designed to utilize 2 different metal particles in 2 layers. It is found that a solar absorptance higher than 95 % can be achieved in a 2-layer cermet coating,whose thermal emittance in 600 ℃ is 26%. For this 2-layer coating,its photo-thermal efficiency is higher than 93 % in the working condition with a concentrating factor of 400.
The effect of metal particles in cermet coatings on spectral selectivity is studied by Mie theory and Monte Carlo ray tracing algorithm. Cr and W particles with radius of 10-200 nm embedded in Al2 O3 are considered. 2-layer cermet coatings are designed to utilize 2 different metal particles in 2 layers. It is found that a solar absorptance higher than 95 % can be achieved in a 2-layer cermet coating,whose thermal emittance in 600 ℃ is 26%. For this 2-layer coating,its photo-thermal efficiency is higher than 93 % in the working condition with a concentrating factor of 400.
引文
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[2] Nejati M R, Fathollahi V, Asadi M K. Computer simulation of the optical properties of high-temperature cermet solar selective coatings[J]. Solar Energy,2005,78(2):235—241.
[3] Zhang Q C. Recent progress in high-temperature solar selective coatings[J]. Solar Energy Materials and Solar Cells,2000,62(1):63—74.
[4] Zhang Q C,Shen Y G. High performance W-AlN cermet solar coatings designed by modelling calculations and deposited by DC magnetron sputtering[J]. Solar Energy Materials and Solar Cells,2004,81(1):25—37.
[5]丁大伟,蔡伟民.高温太阳光谱选择性吸收涂层计算机模拟[J].太阳能学报,2008,29(11):1353—1358.[5] Ding Dawei,Cai Weimin. Computer simulation of hightemperature solar selective absorber[J]. Acta Energiae Solaris Sinica,2008,29(11):1353—1358.
[6]丁迪,张贵锋,冯煜东,等. AlN薄膜对太阳能吸收率的研究[J].太阳能学报,2012,33(1):68—72.[6] Ding Di,Feng Guifeng,Feng Yudong,et al. Research on AlN thin film for solar absorptance[J]. Acta Energiae Solaris Sinica,2012,33(1):68—72.
[7] Arancibia-Bulnes C A,Estrada C A,Ruiz-Suárez J C.Solar absorptance and thermal emittance of cermets with large particles[J]. Journal of Physics D:Applied Physics,2000,33(19):2489—2496.
[8] Arancibia-Bulnes C A,Ruiz-Suárez J C. Spectral selectivity of cermets with large metallic inclusions[J].Journal of Applied Physics,1998,83(10):5421—5426.
[9] Wang Xiaoxin,Li Haofeng,Yu Xiaobai,et al. Highperformance solution-processed plasmonic Ni nanochainAl2O3selective solar thermal absorbers[J]. Applied Physics Letters,2012,101(20).
[10]阮立明,谭建宇,董士奎,等.辐射传递蒙特卡洛法精度分析及数值试验[J].工程热物理学报,2003,24(5):813—816.[10] Ruan Liming,Tan Jianyu,Dong Shikui,et al. The precision analysis about radiative transfer Monte-Carlo method and numerical experiment research[J].Journal of Engineering Thermophysics,2003,24(5):813—816.
[11] Bohren C F,Huffman D R. Absorption and scattering of light by small particles[M]. New York:John Wiley&Sons,2008,92—104.
[12] Palik E D. Handbook of optical constants of solids(Vol. 1)[M]. New York:Academic Press, 1985,357—358.
[13] Palik E D. Handbook of optical constants of solids(Vol. 2)[M]. Boston:AcademicPress,1991,374—376.
[14] Palik E D. Handbook of optical constants of solids(Vol. 3)[M]. San Diego:Academic press,1998,653—657.