High temperature solar absorber coating and method of applying same
First Claim
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1. In a solar energy collector system of the type operable at temperatures above about 550°
- F. including a heat transfer member and wherein means are provided for concentrating incident solar radiation by a factor of from about 40 to 2000 to impinge on said heat transfer member, the improvement comprising a nonselective radiation absorbing surface coating on said heat transfer member, said surface coating being selected from ferrites, oxides of nickel, cobalt, iron, strontium and molybdenum and mixtures thereof having a solar absorptance greater than about 0.90 at wavelengths of from about 0.35μ
to about 3.0μ
.
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Abstract
Improved coatings for high temperature solar collectors comprise thermally stable inorganic oxides selected from ferrites, metal oxides and mixtures thereof having solar absorptances greater than 0.9 at wavelengths ranging from about 0.35 to 3.0 microns. The coatings can be applied to a heat transfer surface by painting an organic silicate dispersion of the optically active material onto the substrate and thereafter curing the silicate binder.
17 Citations
17 Claims
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1. In a solar energy collector system of the type operable at temperatures above about 550°
- F. including a heat transfer member and wherein means are provided for concentrating incident solar radiation by a factor of from about 40 to 2000 to impinge on said heat transfer member, the improvement comprising a nonselective radiation absorbing surface coating on said heat transfer member, said surface coating being selected from ferrites, oxides of nickel, cobalt, iron, strontium and molybdenum and mixtures thereof having a solar absorptance greater than about 0.90 at wavelengths of from about 0.35μ
to about 3.0μ
. - View Dependent Claims (2, 3, 4, 6, 7, 8)
- F. including a heat transfer member and wherein means are provided for concentrating incident solar radiation by a factor of from about 40 to 2000 to impinge on said heat transfer member, the improvement comprising a nonselective radiation absorbing surface coating on said heat transfer member, said surface coating being selected from ferrites, oxides of nickel, cobalt, iron, strontium and molybdenum and mixtures thereof having a solar absorptance greater than about 0.90 at wavelengths of from about 0.35μ
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5. The solar collector system of claimm 2 wherein the ferrite is a lithium-zinc ferrite.
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9. In a solar collector system of the type having light reflector means for concentrating incident solar radiation so as to impinge on a heat transfer member whereby the incident solar radiation is concentrated by a factor of from about 40 to 2000, the improvement comprising:
- an inorganic oxide coating on said heat transfer member, said coating having an absorptance greater than about 0.90, at wavelengths from about 0.35 to about 3.0μ and
an emittance greater than 0.45 at wavelengths greater than 3.0μ
, said inorganic oxide being selected from the group consisting of ferrites, oxides of nickel, cobalt, iron, molybdenum and strontium and mixtures thereof. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- an inorganic oxide coating on said heat transfer member, said coating having an absorptance greater than about 0.90, at wavelengths from about 0.35 to about 3.0μ and
Specification