Solar energy collector having solar selective coating of low ref

Details Solar energy collector having solar selective coating of low ref Solar energy collector having solar selective coating of low ref

1980-06-23

1982-06-15

Davis, Albert W.

Stoves and furnaces

Tool having fluid fuel burner

Curling iron

126901, 350 17, 428615, 428620, 428650, F24J 307

Patent

active

043345239

ABSTRACT:
A solar energy collector and process for its preparation are disclosed in which the collector has a solar selective layer of overlying, multiple coatings. The first coating is a reflective metal; the second coating is a semiconductor material being absorbent in the solar spectrum; and the third coating being the coating exposed to solar radiation is a dielectric material defining an anti-reflection guard. The dielectric coating is transparent to radiation in the solar spectrum and has a relatively low refractive index. The thickness of the dielectric coating is of a magnitude to decrease reflectance from the semiconductor coating by destructive interference. The solar selective layer may be prepared by depositing the various coatings in sequence as by thermal evaporation techniques.

REFERENCES:
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patent: 3272986 (1966-09-01), Schmidt
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patent: 4098956 (1978-07-01), Bickenderfer
patent: 4105014 (1978-08-01), Schwerzel et al.
patent: 4122239 (1978-10-01), Riboulet
patent: 4122831 (1978-10-01), Mahdjuri
"High Absorptivity Solar Absorbing Coatings", by Mattox and Sowell, J. Vac. Sci. Tech. vol. 11, No. 4, Jul. 1974, pp. 793-796.
"Variable Refractive Index Optical Coatings" by Yadava et al., Thin Solid Films 17 (1973), pp. 243-252.

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