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Proceedings Paper

Fabrication Of ZrCx/Zr And Cr-CrOx Films For Practical Solar Selective Absorption Systems
Author(s): Y. Noguchi; K. Naka; A. Isao; K. Nakamura; S. Sawada; T. Tani; S. Gonda
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Paper Abstract

The developments of solar-selective absorption systems for the practical use of solar energy applications have been investigated. For the higher temperature use, 700 % 800°K, ZrCx/Zr films' with excellent heat-resistant characteristics were deposited on the stainless steel(SUS-304) pipes, 30 mm in diameter and 4500 mm in length, by reactive r-f sputtering of pure Zr cylindrical targets. The obtained collector surfaces exhibit the optical properties of a r‘, 0.93 (in visible wave length region) and E ti 0.25 (at A = 3 % 4 μm) and heat-resistant durability at ti 900°K. An absorption tube is to be settled in an evacuated glass tube-type collector, coated with ITO selective transparent film, constructed in an Al parabolic plane mirror system for the solar - thermal electric power generator in the "Sunshine project". For the lower temperature use of the solar thermal energy, below 400 ~450°K, the Cr-CrOx composite films deposited on a thin Alfoil of 40 pm thick have been developed. Cr-CrOx composite films were deposited having a graded composition by reactively evaporating Cr metals in an oxygen atmosphere of oxygen partial pressure%of 10-2 % 10-3 Pa with a roll-coating system. The obtained optical characteristics are a % 0.9 in visible wave length region and c (ε,' 0.1 at λ = 6 ~ 10 μm. The products showing stable operating characteristics are capable to apply on the heating and cooling of buildings and other general uses.

Paper Details

Date Published: 12 April 1982
PDF: 7 pages
Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); doi: 10.1117/12.933264
Show Author Affiliations
Y. Noguchi, Institute for Super Materials (Japan)
K. Naka, Institute for Super Materials (Japan)
A. Isao, Institute for Super Materials (Japan)
K. Nakamura, ULVAC Coating Corp. (Japan)
S. Sawada, ElectrotechnicaI Laboratory (Japan)
T. Tani, ElectrotechnicaI Laboratory (Japan)
S. Gonda, ElectrotechnicaI Laboratory (Japan)

Published in SPIE Proceedings Vol. 0324:
Optical Coatings for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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