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Proceedings Paper

Black nickel-copper solar selective coatings
Author(s): S. John
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Paper Abstract

In solar collectors used for low temperature applications such as water or air heating the primary heat losses are reradiation in the infrared, convection and conduction losses to the air. To improve the performance of these collectors considerable amount of work has been undertaken over the past few decades in the development of selective coatings which could be applied to the absorber plate surface to reduce the effective emittance of the absorber plate. Many candidate materials exist which offer selective optical properties. These include electroplated, chemically deposited, vacuum coated and paint coatings. Electroplating technique has been industrially used for the production of selective black coatings as it offers a number of advantages over its rivals. This paper reports on the development of nickel-copper selective coating from an electrolyte containing 40 g/l nickel sulphate, 20 g/l copper sulphate, 15 g/l ammomium acetate operated at a pH of 5.5 at 35 degree(s)C at a current density of 4 A/dm2 for a deposition time of 30 seconds. Optimized coating is characterized by solar absorptance ((alpha) ) of 0.98 and thermal emittance ((epsilon) ) of 0.10.

Paper Details

Date Published: 9 September 1994
PDF: 12 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185364
Show Author Affiliations
S. John, Central Electrochemical Research Institute (India)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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