Stoves and furnaces – Heaters – Surface
Patent
1977-08-19
1979-02-06
Sprague, Kenneth W.
Stoves and furnaces
Heaters
Surface
126270, F24J 302
Patent
active
041379039
ABSTRACT:
A solar heat absorber, generally used in series, induces relatively high temperatures in a liquid or gas medium from the sun's rays at any angle above the horizon. The absorber consists of a substantially spherical vessel made of a transparent material encasing one or more similar but somewhat smaller vessels, all of which are provided with an opening or neck, the outer one of which overlaps the inner one and is sealed thereto. The annular space or spaces between the vessels are evacuated of air thereby insulating the inner vessel against heat loss to the atmosphere. One surface of the inner vessel is coated with a solar heat absorbing material or the vessel material is integrally colored. The combined vessels are sealed at the neck to a tubular fitting having longitudinal passages for supplying a heat transfer medium to, and discharging it from, the inner vessel. The supply passage may be provided at its upper end with a deflector or spray nozzle to assist in circulation of the medium and to assure its complete absorbtion of the available solar heat. In operation any desired number of such devices are connected in series to a pipeline by means of tee connectors which are provided with internal channels directing incoming heat transfer medium into and out of the tubular fittings. When a medium is forced thru the series of units by outside means it is progressively heated by each absorber in the system. In this manner the temperature of the medium may be raised any practical amount limited only by the strength of the materials used in the system and the systems' inherent heat loss characteristics.
REFERENCES:
patent: 980505 (1911-01-01), Emmet
patent: 4016860 (1977-04-01), Moan
patent: 4018215 (1977-04-01), Pei
patent: 4048982 (1977-09-01), Pei
patent: 4048983 (1977-09-01), Pei
Sprague Kenneth W.
Yeung James C.
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