Fresnel scroll solar tracking device

Details Fresnel scroll solar tracking device Fresnel scroll solar tracking device

1988-01-26

1988-08-23

Corbin, John K.

Stoves and furnaces

Stoves

Cooking

126440, 350167, F24J 302, G02B 308

Patent

active

047657260

ABSTRACT:
A "Fresnel Scroll" is an optical mechanism which functions as a tracking element (and also, in its preferred embodiments, as a focusing element) in a tracking solar collector system. The device comprises a long, flexible film of transparent optical material, a portion of which is supported in tension over an aperture region, with portions of the film outside of the aperture region stowed compactly on two adjoining storage reels. An incident beam impinging on the film is redirected by means of Fresnel facets distributed over the film surface. The facet structure varies nonuniformly along the film's length dimension, so that the device's optical function can be dynamically varied in response to changes in the incident beam direction by scrolling the film across the aperture, feeding it from one reel to the other. By this means, a Fresnel Scroll may operate in conjunction with other elements of a collector system to concentrate a beam of sunlight of varying direction onto a point- or line-focus receiver.

REFERENCES:
patent: 4056309 (1977-11-01), Harbison et al.
patent: 4134393 (1979-01-01), Stark et al.
patent: 4289118 (1981-09-01), Stark
patent: 4312709 (1982-01-01), Stark et al.
patent: 4456783 (1984-06-01), Baker
patent: 4553531 (1985-11-01), Rosende
patent: 4672948 (1987-06-01), Rosende
Dudley et al., "Performance Testing of the FMC Fresnel-Belt Concentrating Solar Collector," Report Sand 80-001, Sandia National Laboratories, 1980, pp. 2-11, 29.

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