Journal
APPLIED THERMAL ENGINEERING
Volume 109, Issue -, Pages 988-996Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.05.163
Keywords
Tandem absorber layer; Nanoporous; Cr-Mn-Fe composite oxide; ZrO2-SiO2; SiO2 nanoparticle layer; Antireflective layer
Funding
- US-India Partnership to Advance Clean Energy-Research (PACE-R) - U.S. Department of Energy (Office of Science) [DE AC36-08G028308]
- US-India Partnership to Advance Clean Energy-Research (PACE-R) - U.S. Department of Energy (Office of Basic Energy Sciences) [DE AC36-08G028308]
- US-India Partnership to Advance Clean Energy-Research (PACE-R) - U.S. Department of Energy (Energy Efficiency and Renewable Energy, Solar Energy Technology Program) [DE AC36-08G028308]
- US-India Partnership to Advance Clean Energy-Research (PACE-R) - U.S. Department of Energy (Office of International Affairs) [DE AC36-08G028308]
- US-India Partnership to Advance Clean Energy-Research (PACE-R) - Government of India [IUSSTF/JCERDC-SERIIUS/2012]
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New single layer, double layer and triple layer absorber tandems were designed and developed for high performance Organic Ranking Cycle (ORC) based solar thermal applications. A Cr-Mn-Fe composite oxide based absorber layer is devolved by controlled chemical oxidation and designed to have a nanoporous structure. It is covered with double antireflective layers a ZrO2-SiO2 nanocomposite layer developed by the sol-gel route and a porous SiO2 layer obtained from SiO2 nanoparticle suspension. Double and triple layer tandem absorbers were developed by a combination of chemical, sol-gel and nanoparticle suspension methods. By varying process parameters like duration, temperature and withdrawal speed, different combinations of Cr-Mn-Fe oxides/ZrO2-SiO2 double layer tandem and Cr-Mn-Fe oxides/ZrO2-SiO2/SiO2 triple layer tandem composite absorber layers with varying refractive indices were developed on an economical variety of SS substrate. The optimized thickness of the absorber layer along with the antireflective layers shown a high absorptance (alpha = 94.9) and low warm emittance (epsilon = 0.122 at 300 degrees C). More specifically, this novel double layer tandem coating has excellent optical properties along with high corrosion resistance (withstands > 200 h in salt spray test). It has good thermal stability in an open air atmosphere and is well suited for low and medium temperature solar thermal applications. (C) 2016 Elsevier Ltd. All rights reserved.
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