Wet-chemistry based selective coatings for concentrating solar power

Eran Maimon, Abraham Kribus, Yuri Flitsanov, Oleg Shkolnik, Daniel Feuermann, Camille Zwicker, Liraz Larush, Daniel Mandler, Shlomo Magdassi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Spectrally selective coatings are common in low and medium temperature solar applications from solar water heating collectors to parabolic trough absorber tubes. They are also an essential element for high efficiency in higher temperature Concentrating Solar Power (CSP) systems. Selective coatings for CSP are usually prepared using advanced expensive methods such as sputtering and vapor deposition. In this work, coatings were prepared using low-cost wet-chemistry methods. Solutions based on Alumina and Silica sol gel were prepared and then dispersed with black spinel pigments. The black dispersions were applied by spray/roll coating methods on stainless steel plates. The spectral emissivity of sample coatings was measured in the temperature range between 200 and 500°C, while the spectral absorptivity was measured at room temperature and 500°C. Emissivity at wavelengths of 0.4-1.7 μm was evaluated indirectly using multiple measurements of directional reflectivity. Emissivity at wavelengths 2-14 μm was measured directly using a broadband IR camera that acquires the radiation emitted from the sample, and a range of spectral filters. Emissivity measurement results for a range of coated samples will be presented, and the impact of coating thickness, pigment loading, and surface preparation will be discussed.

Original languageEnglish
Title of host publicationNonimaging Optics
Subtitle of host publicationEfficient Design for Illumination and Solar Concentration X
PublisherSPIE
ISBN (Print)9780819496843
DOIs
StatePublished - 1 Jan 2013
EventNonimaging Optics: Efficient Design for Illumination and Solar Concentration X - San Diego, CA, United States
Duration: 25 Aug 201326 Aug 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8834
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNonimaging Optics: Efficient Design for Illumination and Solar Concentration X
Country/TerritoryUnited States
CitySan Diego, CA
Period25/08/1326/08/13

Keywords

  • Absorptivity
  • CSP
  • Emissivity
  • Measurements
  • Radiation heat transfer
  • Selective coatings
  • Solar Energy

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