学术讲座:Designing and Deposition of Multilayer Selective
  • 来源:深圳大学物理科学与技术学院
  • 发布者:physics
  • 发布时间:2016-09-08 10:14:44
  • 浏览次数:602
  • 题目:Designing and Deposition of Multilayer Selective Surface for Tuning Absorption and Reflection of Solar Spectra

    主讲:曹峰,休斯顿大学博士后

    时间:20151224日(周四)下午15:30

    地点:科技楼313

    报告内容:Spectrally-selective solar absorbers are widely used in solar hot water and concentrating solar power (CSP) systems. However, the performance at high temperatures (>500 oC) is still not satisfactory due to their high infrared (IR) emittance and degraded thermal stability. Recent progress on cermet-based solar absorbers has shown promising high temperature thermal stability and wavelength selectivity. Here we explore W-Ni-Al2O3, W-Ni-YSZ ﴾yttria-stabilized zirconia﴿, and W-Ni-SiO2cermet based spectrally selective surfaces for high-temperature solar absorber applications. The developed multilayer selective surfaces are deposited by magnetron sputtering on different substrates depending on applications. The absorber consists of two solar absorbing cermet layers with different W-Ni volume fraction inside the dielectric matrix, one or two anti-reflection coatings ﴾ARCs﴿, and one tungsten IR reflection layer for reduced IR emittance and improved thermal stability. All these absorbers show an absortance of > 90% for temperature up to 500 °C and emittance of ~5% at about room temperature and 10-15% at 500 °C. Recently we are developing a new kind of absorber that reflects a certain range of wavelength and absorbs the rest of the whole solar spectra. The absorbed part is used for electrical power generation by steam engine and the reflected part is used for solar photovoltaic conversion. The thermal energy can be easily stored for later conversion to provide electrical power around the clock without worrying the Sun’s night time.

    主讲人简介:Dr. Feng Cao is currently a research associate at the Department of Physics and The Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston. He received his Ph. D. degree in Physics from the Hong Kong Polytechnic University in 2012. Before pursuing his Ph. D. degree, he worked as an assistant workshop director in Zhejiang Globe Solar Science & Technology Co., Ltd for the design of solar cell module (2006) and the manager of R&D for Li-ion battery in Hangzhou Lingri Science & Technology Co., Ltd (2006-2009). After completion of the Ph. D. program, he worked as a Postdoctoral fellow at the Boston College for one year (2012) and then moved to the University of Houston as a research associate (2013-present). His research has included the optimization and design of solar selective coatings for harvesting solar radiation, and electrochemical energy storage. He has published more than 20 scientific papers in peer-reviewed journals and is listed as an inventor on three patents related to the functional films.