The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers | Zendy

Nathan P. Siegel | Zendy; Michael D. Gross | Zendy; Robert Coury | Zendy

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The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers

Author(s) -

Nathan P. Siegel,

Michael D. Gross,

Robert Coury

Publication year - 2015

Publication title -

journal of solar energy engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.55

H-Index - 83

eISSN - 1528-8986

pISSN - 0199-6231

DOI - 10.1115/1.4030069

Subject(s) - absorptance , materials science , absorption (acoustics) , solar energy , particle (ecology) , degradation (telecommunications) , oxide , thermal energy storage , chemical engineering , optoelectronics , optics , composite material , metallurgy , physics , electronic engineering , reflectivity , thermodynamics , ecology , oceanography , engineering , biology , geology

Spherical sintered bauxite particles between 200 μm and 700 μm in diameter have been shown to be effective in the direct absorption and storage of concentrated solar energy. These particles are commercially available in large quantities and exhibit as-received solar weighted absorptance (αs) greater than 0.90, which gradually degrades with extended heating in air at 700 °C and above. The degradation mechanism is an oxidation reaction that can be reversed via thermal or chemical reduction, resulting in αs > 0.95 along with enhanced resistance to further degradation for some formulations. Certain metal oxide pigments, added to Al2O3:SiO2, have proven to achieve solar weighted absorptance levels similar to those of the commercially available particles and may be promising alternatives to currently available materials.

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