Development of Selective Solar Absorber Coating by・ Stratified Integration of Mesoscopic Structures

通过介观结构的分层集成开发选择性太阳能吸收涂层

基本信息

批准号：
14550651
负责人：
ISHIGURO Takashi
金额：
$ 1.98万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550651/
关键词：
solar absorber coating functional graded structure rough surface mesoscopic structure ultra-fine particles energy conversion film probe microscopy solar selectivity 凹凸表面

项目摘要

It is the time to promote the energy shift from fossil fuel to natural alternative energy resources. The photothermal energy conversion is one of the solutions. Surfaces of this kind of solar absorber coating require a high solar absorptance (α) and a concomitant low thermal emittance (ε), i.e., solar selectivity. In order to improve photothermal energy conversion efficiency (η), the mesoscopic structure such as nano-particles and rough surface are especially concerned in this study.First of all, optical properties and thermal stability of the nano-structured Ag are evaluated. Based on the result, the high performance of photothermal conversion (η=0.72 at 373K for AM1.5 and ultimate temperature of 550K) is successfully realized.We recently developed a solar absorber coating with high a induced by surface roughness. This is the Al-N film prepared by reactive rf sputtering. We clarified that one of the reasons for the high a is the gradient-refractive index caused by the surface roughness. Unfortunately, the t was rather high and this should be improved.Therefore, in this study, a solar selective absorber coating with surface roughness is fabricated. First, the Al film with proper surface roughness, the degree of which is prepared by a method of two-step deposition of an Al layer at two different substrate temperatures, is prepared as an infrared reflector, which contributes to the low e. Then the Al-N film as an absorber layer is deposited on this Al reflector. In addition, a transparent AlN film is examined for use as an anti-reflector in the solar selective absorber with surface roughness. As the result, high performance of α=0.92(AM1.5),ε=0.06(373K), and then η=0.86 have been realized.As the other method, the courting by the Sn doped indium oxide (ITO) film on the AI-N film was examined. By the deposition of ITO film at 298K followed by the annealing at 773K, the emittance could be successfully suppressed.

它是自然的替代能量cat曲。即，在这项研究中，太阳能表面尤为关注。首先，基于纳米结构的光学特性和基于光热转化的高性能（η= 0.72） 5和550k的终极ure得以成功实现。韦德开发了一个由表面粗糙度诱导的太阳吸收器涂层。不幸的是，Twas的表面粗糙度较高，这是由表面粗糙度提高的。在两个不同的底物温度下，Al层的两步沉积是作为红外反射器制备的结果是，α= 0.92（AM1.5）的高性能，然后实现η= 0.86。作为另一种方法，通过沉积物检查了氧化二颗二颗粒（ITO）的求爱在298k的ITO胶片中，随后在773K处退火。