Stoves and furnaces – Solar heat collector – Controlling solar radiation
Patent
1999-05-17
2000-08-29
Price, Carl D.
Stoves and furnaces
Solar heat collector
Controlling solar radiation
126649, 126650, 126624, F24J 200
Patent
active
061092584
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a device for collecting solar energy and transferring it to a receiving medium to be heated.
There is already known from French patent No. 92 03962 a device of this type which comprises a multiplicity of substantially horizontal profiled elements spaced from one another and arranged in tiers to form a screen having an external face designed to be exposed to solar radiation and an internal face designed to be mounted against the receiving medium, the profiled elements defining between them a multiplicity of air channels extending between the external face and the internal face, closure means being provided to trap the air contained in the channels.
The profiled elements allow the solar energy to be collected and to be conducted towards the internal face of the screen situated adjacent to the receiving medium which could, for example, be an outside wall of a building or a volume of air inside a building. It also achieves heating of the air contained in the channels defined between the profiled elements.
The principal aim of the invention is to simplify the structure of these profiled elements while at the same time allowing the achievement of improved thermal performance compared with that obtained by the collecting device known from the above-mentioned French patent.
With this in mind there is proposed according to the invention a collecting device of the type defined above in which the profiled elements take the form of transparent or translucent strips having the properties of low absorption of solar radiation and of low thermal conduction, the said strips being made from a sheet of thin material and a having a profile which has a rising terminal portion adjacent to the internal face of the screen.
The term "screen" is used in its general sense to designate the assembly formed by the tiered strips which constitute a kind of perforated panel. This term should not be interpreted in its narrow sense as designating a piece of furniture fabric or the like.
By virtue of the fact that the strips of the screen are transparent or translucent and not essentially reflecting as in the above mentioned French patent there is obtained an improved capture of the solar energy, the light captured being able to reach as far as the internal face of the screen, that is to say to the receiving medium to be heated.
Moreover the capture is improved by virtue of the fact that the strips have a low absorption of solar radiation and a low thermal conduction, thereby limiting the loss of energy.
The expression "low thermal conduction" is intended to include also the case where the strips are non-conducting of heat.
As the strips are formed by taking a film of thin material they can be supported by a lightweight structure.
Ideally the material of which the strips are formed is a non-conductor of heat. In fact it is important that the strips should be non-conducting in the direction of penetration of the solar energy, that is to say from the external face towards the internal face of the screen.
The strips are preferably formed of a woven or non-woven material based on mineral or synthetic fibers, in particular glass fibers, the material having good transparency and low retention of the radiated energy.
The material from which the strips are formed could, where appropriate, be impregnated with a substance designed to improve their characteristics of sealing, transparency, brilliance, reflection, rigidity or durability.
In a first general embodiment of the invention the strips have a generally rectilinear profile arranged inclined to the horizontal in such a way that the air channels are directed to rise from the external face to the internal face of the screen.
This particular configuration facilitates the rise of the warm air contained in the channels towards the internal face of the screen.
In a second general embodiment of the invention the strips have a generally V-shaped profile such that the channels present successively a descending portion and a rising portion f
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Cocks Josiah C.
Price Carl D.
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