Solar energy collection and retrieval employing reversible photo

Details Solar energy collection and retrieval employing reversible photo Solar energy collection and retrieval employing reversible photo

1975-06-30

1977-01-25

Williams, Howard S.

Stoves and furnaces

Ovens

Domestic

126400, 204158R, F24H 700, F24J 302

Patent

active

040045722

ABSTRACT:
A process for photochemical collection, storage, and retrieval of solar energy, including solar energy in the visible and near-infrared light spectrum, comprising: exposing to solar radiation of a trans-isomer of particular geometrically isomerizable compounds, while dissolved in a predominantly (greater than 50 percent by volume) aqueous liquid medium, to isomerize the trans-isomer to a thermodynamically less stable, but kinetically stable, cis-isomer of higher energy content, heating the produced cis-isomer to an activation temperature triggering exothermal conversion (or return) of the cis-isomer to the trans-isomer with release of thermal energy; and continuing exothermal conversion of cis-isomer to trans-isomer through use of a portion of the exothermically released thermal energy and transferring of another portion of the released thermal energy from the region of exothermal conversion for availability of this other portion for useful thermal energy applications; with the therein employed geometrical isomerizable compound being possessed of defined properties including the properties of both the trans-isomer and cis-isomer having light absorbance maxima lying between the wavelengths of 350 and 800 nm with the absorbance maxima of the cis-isomer occuring at a shorter wavelength than the absorbance maxima of the trans-isomer, and being selected from compounds having these defined properties and certain structural formulae.

REFERENCES:
patent: 2677664 (1954-05-01), Telkes
patent: 3957030 (1976-05-01), Davis

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