Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1983-11-03
1985-08-13
Dority, Jr., Carroll B.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
165166, F24J 302
Patent
active
045343373
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a solar-energy collector.
Solar-energy collectors of this kind are still encumbered with a number of cost-increasing disadvantages. In order to withstand the mechanical stresses and strains which are created partly as a result of external influences and partly as a result of internal pressures in the absorber unit, it is necessary to use a particularly strong and robust material, normally copper sheet or aluminium sheet, and sometimes steel sheet, particularly when the heat-transport medium is air. For the same reason, the cavity is normally divided into a plurality of mutually parallel ducts. Particularly when such ducts are provided, and even in the absence of said ducts, the flow of medium through the cavity can readily become unevenly distributed across the whole of the cross-section of the cavity, requiring manual adjustments to be made, so that the whole of the collector surface can be utilized.
The object of the invention is to provide a solar-energy collector having an absorber unit which, despite the use of lightweight and weak materials, is able to withstand high external and internal pressures, and which is constructed so as to provide absolutely uniform distribution of the medium flow across the whole cross-section and area of the collector.
This object is achieved with a solar-energy collector having a wave-form configuration which, in combination with the connections at the abutment locations, provides fixation of the wave-form and also affords considerable resistance to bending. In addition, as a result of the wave-form of respective plates, the flow of medium is also divided into a plurality of mutually intersecting part-flows, and each time two part-flows intersect each other, they are divided into further part-flows. At the same time, there is obtained additional contribution from adjacent part-flows. Even though the collector should be unevenly irradiated, so that part of the collector becomes too hot with subsequent impairment of its efficiency, the temperature will be rapidly equilized throughout, so as to constantly obtain the highest possible efficiency.
The invention will now be described more clearly with reference to various embodiments of solar-energy collectors according to the invention illustrated in the accompanying drawings, in which
FIG. 1 is a front view of a first embodiment,
FIG. 2 is a cross-sectional view taken on the line II--II in FIG. 1,
FIG. 3 is a detail view in perspective of the two plates illustrated in FIGS. 1 and 2,
FIGS. 4 and 5 are each front views of a plate having pressed therein recesses to form a wave-shape sector part on respective plates, and
FIGS. 6 and 7 are respectively a cross-sectional view and a view taken on the line VII--VII in FIG. 6 of a preferred embodiment of the invention.
FIGS. 1-3 illustrate two mutually parallel plates 1, 2 made from thin aluminium sheet and having mutually facing, inwardly pressed ridges 3, 4 which cross each other and which are connected to one another at the locations of intersection by means of an adhesive or spot welds. The plates are connected around their periphery, in some suitable manner, with a ring-like frame 5 constructed from aluminium section having abutment surfaces adapted to the wave-form of the plates. The height of the frame 5 is sufficient to form an air-filled cavity 6 between the absorber unit 1, 2, 3, 4 and a cover plate 7 made of transparent material, for example glass, joined to the frame 5, and a cavity for accommodating heat-insulating material 8 between absorber units and a rear side 9 attached to the frame.
At each end of the solar-energy collector, the frame 5 is provied with through-passing passages 10, which connect the cavity between the plates 1 and 2 to inlet and outlet passages 11, 12 respectively for the medium to be heated.
The main direction of flow of the medium is indicated by an arrow H in FIG. 3, from which figure it will be seen that the flow of medium will be divided into a plurality of part-flows which are constantly divided up and mixed in
REFERENCES:
patent: 4307779 (1981-12-01), Johansson et al.
patent: 4470455 (1984-09-01), Sacca
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