Stoves and furnaces – Ovens – Domestic
Patent
1976-08-19
1978-04-11
O'Dea, William F.
Stoves and furnaces
Ovens
Domestic
126271, 350331, 237 1A, 136 89PC, F24J 302, G02B 523
Patent
active
040833569
ABSTRACT:
A flat solar collector apparatus includes an inner energy absorber plate having a absorber surface and energy transfer passageway connected to a storage unit. A transparent cover is secured in outwardly spaced and sealed relation to the absorber plate to define a sealed air space therebetween. The cover includes a pair of stacked, transparent sheets having light transmitting conductive coatings on the opposed sides or faces. Each conductive coating is provided with an electrical connector means for connection to a suitable power supply with an insulating spacer located between the outer peripheries defining a chamber filled with nematic liquid crystals. A D. C. or A. C. voltage source connected to the coatings controls the light scattering characteristic of the crystals and thereby changes the cover from a normally highly transparent to an increasingly translucent state, and thereby the energy transmittance of the cover. The voltage can be controlled manually or in accordance with a desired parameter of the energy collecting system to prevent damaging temperatures in the system. Metal oxide coatings on a collector cover also directly function to increase the absorber temperature for a given solar energy input.
REFERENCES:
patent: 2030350 (1936-02-01), Bremser
patent: 2595905 (1952-05-01), Telkes
patent: 3898977 (1975-08-01), Draper
patent: 3987780 (1976-10-01), Nozik et al.
patent: 4005032 (1977-01-01), Hass et al.
Johnson Controls Inc.
Jones Larry
O'Dea William F.
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