ES2577903B2 - ATMOSPHERIC THERMO-SOLAR RECEIVER, WITH SHORT-SHOT - Google Patents

Abstract

Atmospheric thermo-solar receiver, with draft-cutter. # Longitudinal receiver in which the heating fluid tubes are located inside a first open cavity surrounded by thermal insulating material, which in turn opens into a wider cavity, delimited by the same thermal insulator; there is another separate, parallel insulator on the outside, which starts from a lower dimension than the termination level of the first insulator; and in the longitudinal direction, the upper wall of the first cavity is increasing its elevation linearly in successive sections, until it reaches a vertical stop or limiting wall of each section, the height of the upper wall falling to the level of the beginning of the section.

Description

ATMOSPHERIC THERMO-SOLAR RECEIVER, WITH SHORT-SHOT

DESCRIPTION

SECTOR OF THE TECHNIQUE 5

The invention fits in the field of solar energy collectors with a single tracking axis that coincides with the longitudinal axis of the collector, and that allows the movement of the concentrator according to the elevation angle, reaching them in a transverse way the solar radiation that is Focus on them.

 10

TECHNICAL PROBLEM TO BE RESOLVED AND BACKGROUND OF THE INVENTION

The problem is to configure a structural mechanical system that allows high temperatures to be reached in the tubes through which the heating fluid that constitutes the useful good passes. It has to be done in a simple way to assemble and cheap in terms of components, avoiding those that are problematic because of their poor durability.

There are a high number of documents, both scientific and industrial property, that disclose assemblies of thermo-solar receivers, such as the ES 2321576 B2 patent, whose multiple mounts all have a window of 20 glass or other radiation-transparent material, and It also happens with ES 2345759 B2, and in the generality of the documents known by the applicants.

EXPLANATION OF THE INVENTION 25

The invention consists in locating the tube or tubes of heating fluid inside a first open cavity surrounded by thermal insulating material, or first insulator, which in turn opens in a second wider cavity, also externally delimited by the same insulator thermal; existing outside said insulator, on each side, two air channels, each of which is delimited by the outer part of the above insulator and the inner part of a parallel insulator that develops externally to the first insulator, and starts from a lower dimension than the termination level of the first insulator.

In the longitudinal direction, the upper wall of the first cavity is structured in successive sections, and said wall increases its elevation within each section, in the direction in which the heating fluid moves within the tubes; until the upper wall reaches a vertical stop or limiting wall of said section, then the height of the upper wall falling to the original level of said upper wall at the beginning of said section.

In a transverse straight section, the inner hollow enclosure of the first insulator is composed of a main upper cavity, where the tubes are inserted, and 10 successive downward side cavities, each cavity being separated from the lower immediate one by a horizontal extension of the insulating wall towards the interior of the hollow enclosure, without interfering with the corresponding limit line of arrival of the concentrated radiation to the main upper cavity, on each side. fifteen

EXPLANATION OF THE FIGURES

The figures, in general, are not to scale, since the relative sizes of the elements are very different; but they are representative of the invention and its operating principles. twenty

Figure 1 shows a diagram of a cross section of the thermosolar receiver, including the two cavities and without window in the opening of the cavity.

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Figure 2 shows the longitudinal straight section of the device where a complete section of the upper wall of the first cavity can be seen.

Figure 3 shows an assembly in which several horizontal cavities are used on both side walls of the first cavity, separated by the corresponding extensions of the thermal insulator, into the enclosure.

Figure 4 shows a simplified particular assembly of the device, based on modules of insulating material.

To improve the understanding of the explanation of the figures, the elements that make up the invention are listed below:

1. Beam of tubes

2. Upper wall of the first cavity (formed by the inner insulator)

3. Side wall of the first cavity (formed by the inner insulator)

4. Widening of the first cavity (formed by the inner insulator)

5. Side wall of the widening of the first cavity (formed by 10 the inner insulator)

6. Rising channel (of air) that forms the second cavity

7. External insulation that delimits the second cavity

8. Fastenings of the inner insulator and the tube bundle

9. External insulation fasteners 15

10. Longitudinal bar in which the fastener is crimped 8

11. Longitudinal bar in which the clamp 9 is crimped

12. Crossbar stabilization of the fasteners

13. Trajectory followed by air in free convection

14. Ascending roof section of the main cavity 20

15. Longitudinal japan for holding the receiver

16. Vertical bars of the tube clamping reinforcement

17. Longitudinal tube clamping bar surrounded by the inner insulator on its upper part

18. Tubing bars in the lower structure 25

19. Side cavity

20. Delimitation of the incident paths of concentrated radiation on the device

21. Insulation pieces with which the inner insulator is composed by adhesive or screwed.

22. Delimiting wall of a stretch of ascending roof of the cavity.

23. Plane of symmetry

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EMBODIMENT OF THE INVENTION

The invention is embodied by having an insulating body that can be of a single or mixed material, the most common being to choose a surface resistant to dust, shock and erosion, within which a thermal insulating material such as polyurethane or expanded polystyrene, or fiberglass or 10 rock wool, etc.

The insulating material, and particularly the upper part of its body, has to be mounted around the support structure of the tubes (8), which in turn will have the anchors (10) to be attached to the jacena (15). fifteen

The lower bars (8) of the pipe support structure (1) retain them with the inclination or horizontality required by the project, allowing their free expansion, and as an essential part of the assembly must be taken into account. account that the upper wall (2) of the first cavity has to increase in height according to the direction in which the heating fluid moves inside the tubes, that is, according to the direction in which it is heated.

Successive sections can be made modularly, then spliced longitudinally using the longitudinal bar (17) of the structure supporting the tubes.

The conformation of the inner wall of the first cavity, formed by the first insulator, is the main requirement of the invention, and can be carried out in a different way, either by complete molds of a longitudinal module, or by dividing the whole assembly into elements or modules (21) that adhere or screw each other according to the receiver's project, which must take into account the lines (20) that delimit the passage of concentrated radiation, which cannot be interfered with, nor by the interior or exterior insulation.

This is especially advisable if an assembly with several lateral cavities 5 (19) is used, whose mission is to stabilize the air layers according to their temperature, leaving the hottest ones at the top and going down with a certain temperature gradient towards the opening of the First cavity

This arrangement produces a stagnation of the air stabilized by the density difference itself that is induced as a result of a practically uniform pressure and an increasing temperature with the elevation inside the cavity, which makes the air lighter and warmer. Pond up in the main cavity bounded by its upper wall (2) and side walls (3), and layers of increasingly cold air appear successively downwards, 15 until reaching atmospheric air. The air that can escape from the slightly heated cavity collides with the lower part of the outer insulation, and ascends through the channel (6) in such a way that it prevents the cooling of the outer part of the internal insulation, since this is not cooled by air atmospheric free. twenty

Once the invention is clearly described, it is noted that the particular embodiments described above are subject to modifications in detail as long as they do not alter the fundamental principle and essence of the invention. 25

Claims (1)

1 - Atmospheric thermo-solar receiver, with draft-cutter, in consecutive modules or sections, characterized in that the tube or tubes of heating fluid are located inside a first open cavity surrounded by thermal insulating material, or first insulator, which in turn it opens in a second wider cavity 5, also externally delimited by the same thermal insulator; existing outside said insulator, on each side, two air channels, each of which is delimited by the outer part of the above insulator and the inner part of a parallel insulator that develops externally to the first insulator, and starts from a dimension below the level of completion of the first insulator; and in the longitudinal direction, the upper wall of the first cavity is structured in successive sections, and said wall is increasing its elevation within each section, in the direction in which the heating fluid within the tubes moves; until the upper wall reaches a vertical stop or limiting wall of said section, then the height of the upper wall 15 falls to the original level that said upper wall had at the beginning of said section. 2 - Atmospheric thermo-solar receiver, with draft-cutter, according to claim one, characterized in that in a transverse straight section, the hollow interior 20 of the first insulator is composed of a main upper cavity, where the tubes are inserted, and of successive cavities sideways in a downward direction, each cavity being separated from the immediate lower one by a horizontal extension of the insulating wall into the hollow enclosure, without interfering with the corresponding limit line of arrival of the concentrated radiation to the main upper cavity, for each side. 3 - Atmospheric thermo-solar receiver, with short-throw, according to claim one or two, characterized in that the inner wall of the first cavity is made, either by complete molds of a longitudinal module, or by dividing the entire assembly into elements or modules (21) that adhere or screw each other.