Novel Mo-Si₃N₄ based selective coating for high temperature concentrating solar power applications

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• 作者：Eva C茅spedes ; Men Wirz ; J.A. S谩nchez-Garc铆a ; L. Alvarez-Fraga ; R. Escobar-Galindo ; C. Prieto
• 关键词：Selective coating material ; Solar absorber cermets ; Parabolic trough concentrator for CSP technology
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：March, 2014
• 年：2014
• 卷：122
• 期：Complete
• 页码：217-225
• 全文大小：993 K

文摘

A novel selective coating material based on Mo-Si₃N₄ has been investigated for the first time. Accurate combination of the individual component layers based on optical simulations and precise control of layers thickness and composition leads to high solar absorptivity (伪_Sol=0.926) and low thermal emissivity (蔚_25 掳C=0.017) on a silver film, resulting in a high solar thermal energy conversion efficiency. The tandem absorber is stable in moderate vacuum at temperatures above 600 掳C showing low emissivity (estimated value at 600 掳C is 蔚_600 掳C=0.109) evidencing its relevance for high temperature solar selective applications. A full optical and thermal analysis of a parabolic trough concentrator (PTC) system confirmed the potential of the novel coating material to be used for CSP technology.