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a solar chimney and daytime technology, applied in solar heat collectors with working fluids, solar-ray concentration, solar heat devices, etc., can solve the problems of chimney updraft and chimney updraft, and achieve the effect of improving the efficiency of solar chimneys
Inactive Publication Date: 2008-07-03
YANGPICHIT PITAYA
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[0017]The invention has the further object of improving the efficiency of a solar chimney.
Problems solved by technology
The heating of the air produces an updraft in the chimney.
Thus, an updraft in the chimney can be produced even during the night.
Method used
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[0043]FIGS. 1-3 and 4A-4B illustrate an embodiment of the present invention in which a solar collector and heat exchanger are provided as a single unit located inside a generally cylindrical chimney. The chimney comprises an enclosure for the solar collector and heat exchanger. Solar reflector 1, located outside chimney 10, concentrates sunlight into a high-intensity beam, which passes through lens 3. The lens, which is held by lens holder 4, serves as a means for allowing solar energy to enter the chimney. The lens refocuses the beam through aperture 5, located inside the chimney. The aperture could be made of the same material as that of the chimney, or it could be made of special heat-resistant material.
[0044]The focused solar radiation impinges on absorptive coating 7 disposed on target substrate 9. The absorptive coating comprises a material which facilitates the absorption of solar energy. The target substrate is in thermal contact with primary fins 11, and is in indirect ther...
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Abstract
A solar chimney includes a solar collector which heats air in the chimney, producing updrafts which can be harnessed to perform useful work. The solar collector may be located inside or outside the chimney. The device may include a reservoir for storing a heat transfer fluid, thus enabling the device to be used during both day and night. The solar chimney may be equipped with both internal and external solar collectors, operating in parallel. The solar chimney may also be equipped with multiple external solar collectors, connected in parallel to a reservoir. The solar chimney of the invention provides a convenient and practical way to convert solar energy into electrical power.
Description
BACKGROUND OF THE INVENTION[0001]This invention relates to the production of electric power, or other useful work, from solar energy.[0002]In a solar chimney, energy from the sun heats the air in an elongated, enclosed vertical structure, so as to create an updraft in the structure. The moving air can then be used to drive a turbine to produce electric power, or it can be made to perform other useful work. A solar chimney has the advantage that it does not depend on the presence of wind, but requires only sunlight as the source of energy.[0003]Examples of solar chimneys, as shown in the prior art, are given in U.S. Pat. Nos. 3,979,597, 4,275,309, 4,331,042, 4,433,544, 5,381,048, 6,016,015, 6,089,021, 6,772,593, and 7,026,723, the disclosures of which are incorporated by reference herein.[0004]The present invention provides improvements over the solar chimneys of the prior art. The solar chimney of the present invention concentrates incident solar radiation into a high-intensity beam...
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Patent Type & Authority Applications(United States)
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