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Title: Solar energy collector having solar selective coating of low reflectance

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.


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Inventors: Spanoudis, Louis (Toledo, OH)

Application Number: 06/162220
Filing Date: 1980-06-23
Publication_date: 1982-06-15
Assignee: OWENS ILLINOIS INC

Primary Class(es): 126/652 428/650, 428/615, 359/360, 126/908, 428/620
Other Classes: F24J2/46; F24J2/48; F24J2/00
US Patent Ref:
3176679April, 1965Langley126/901Solar energy collector
3272986September, 1966Schmidt126/901Solar heat absorbers comprising alternate layers of metal and dielectric material
3920413November, 1975Lowery126/901Panel for selectively absorbing solar thermal energy and the method of producing said panel
4029480June, 1977Warren126/901Hydrocarbon fuel compositions containing polysulfone antistatic additives
4033327July, 1977Pei126/901Solar energy collector module system
4055707October, 1977MacDonald126/901Selective coating for solar panels
4087288May, 1978Reid126/901Solar absorber surfaces
4090496May, 1978Mallet126/900Compounds for forming bodies for generating heat from radiant luminous energy, and methods of prepar
4098956July, 1978Bickenderfer126/901Spectrally selective solar absorbers
4105014August, 1978Schwerzel et al.126/900Catalytic extraction of stored solar energy from photochemicals
4122239October, 1978Riboulet126/901Solar absorbers with layers of nickel/chromium alloy and dielectric material
4122831October, 1978Mahdjuri126/901Solar collector comprising an elongate absorber in an evacuated transparent tube

Other Refs: Other References: "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.

Primary Examiner: Davis, Albert W.
Assistant Examiner: Anderson G.
Attorney: Heberling, Richard D.
Click, Myron E.
Wilson, David H.
Claims: