Selective solar energy receiver and method for its production
AssigneePPG Industries, Inc.
InventorCharles B. Greenberg
Life of this patent
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Abstract
A solar energy receiver comprising an aluminum panel and a coating which comprises a black metal sulfide film having a high solar absorptance but a low thermal emissivity and a method for the production of such a receiver by wet chemical deposition onto an aluminum panel of a metal sulfide film from an alkaline aqueous solution of a salt of a metal, a complexing agent for the metal ions, and a sulfur compound capable of reacting with the metal ions in the presence of aluminum to form a metal sulfide are disclosed.
Claims13
A method for producing a solar energy receiving surface comprising the steps of:
- a. cleaning a surface of an aluminum substrate;
- and
- b. contacting the surface of the substrate with an alkaline coating solution consisting essentially of:
- a water soluble salt of a metal selected from the group consisting of nickel, zinc, silver, cadmium, copper cobalt, lead, tin, iron, and combinations thereof;
- a complexing agent for the selected metal;
- a sulfur compound capable of reacting with the selected metal to form a sulfide;
- and
- water
- to form a uniform metal sulfide coating.
A coating composition for the wet chemical deposition of metal sulfide films in the presence of aluminum which consists essentially of:
- a. 1 to 10 grams per liter of a metal salt selected from the group consisting of nickel sulfate, silver nitrate, zinc nitrate, and combinations thereof;
- b. 10 to 150 cubic centimeters per liter of ammonium hydroxide;
- c. 1 to 15 grams per liter of sodium thiosulfate;
- and
- d. water.
Dependencies are inferred from the claim text.