Stoves and furnaces – Solar heat collector – With means to convey fluent medium through collector
Patent
1995-10-25
1998-02-10
Yeung, James C.
Stoves and furnaces
Solar heat collector
With means to convey fluent medium through collector
126675, 126680, F24J 226
Patent
active
057158096
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a receiver for converting concentrated solar radiation, the receiver having a channel and an absorber structure, positioned at the channel inlet and exposed to the concentrated solar radiation, the absorber structure comprised of an air-permeable fiber-like mat material, and a means for transporting air as a cooling medium through the absorber structure.
From EP 124 769 B1 such a receiver is known. Across the channel cross-section metal knit mats are provided in addition to spaced apart wires which metal knit mats serve for absorbing the impinging, concentrated solar radiation. The wires are connected with their upper end to the channel wall and with their lower end support in the manner of a mass pendulum a cylindrical weight piece. In the embodiment according to FIG. 7 of EP 124 769 B1 the absorber structure is comprised of suspended wires and metal knit mats. For adaptation to the solar radiation density which is not constant across the channel cross-section, throttle means are arranged over the cross-sectional channel area such that in areas of higher radiation density greater amounts of air mass streams will occur than in the areas of lower radiation density. In an advantageous manner the throttle means may be realized by a varying density of the arrangement of the structure of the absorber means across the channel cross-section.
The air-permeable fiber-like material should be of a form that is as loose as possible so that the impinging solar radiation can penetrate into the depth of the mat and can be absorbed there. On the other hand, a secure fastening and positioning of the mat material within the channel cross-section requires a certain density.
It is therefore an object of the present invention to provide a receiver of the aforementioned kind with which the material, on the one hand, can absorb in the manner described above solar radiation and, on the other hand, can be securely held within the channel.
This object is solved by providing the mat material in the flow direction of air so as to have increasing density.
SUMMARY OF THE INVENTION
The air is transported in the direction of the impinging solar radiation through the mat material. In the inventive embodiment of the receiver a low density is provided in the direction of flow of air at the forward portion, i.e., a predetermined looseness, in order to absorb in a favorable manner the solar radiation, while the side facing away from the inlet side has a higher density which provides for a secure fastening and positioning of the mat material within the channel. The term "fiber-like mat material" in the subsequent description and in the claims is to be understood as a material that can be manufactured especially according to different methods known from textile technology. The term mat material includes thus, for example, mesh material, woven material, knit material, non-woven material, and fleece.
A high-temperature receiver for converting concentrated solar radiation according to the present invention is primarily characterized by the following features:
a channel with an inlet and an outlet;
an areal air-permeable support element connected to the inlet;
an absorber structure for absorbing solar radiation, the absorber structure supported by the support element and comprised of an air-permeable mat material;
means for transporting air as a cooling medium through the absorber structure in a flow direction identical to a direction in which the solar radiation hits the absorber structure;
wherein the mat material has a first density in an area where the solar radiation enters the absorber structure and a second density in an area where the absorber structure faces the support element; and
wherein the first density is lower than the second density, the first density favoring absorption of the solar radiation and the second density providing for a secure fastening of the absorber structure on the support element.
Preferably, the mat material has a continuously increasing density from the fir
REFERENCES:
patent: 3875925 (1975-04-01), Johnston
patent: 4186721 (1980-02-01), Whitman
patent: 4326504 (1982-04-01), Guadard et al.
patent: 4367727 (1983-01-01), Llorach
patent: 4683872 (1987-08-01), Fricker
Graf Roland
Schmitz-Goeb Manfred
L. & C. Steinmuller GmbH
Yeung James C.
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