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Secondary reflection light gathering and heat collecting device with compound curved surface

A secondary reflection and compound curved surface technology, applied in the field of solar energy concentration and heat collection, can solve the problems of lack of design freedom for a single paraboloid, increase cost and floor space, reduce concentration ratio, etc., to achieve increased degrees of freedom , Increase the concentration ratio, the effect of increasing the concentration ratio

Inactive Publication Date: 2010-03-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has the problem of difficulty in manufacturing large-area paraboloids and high cost; and due to the limitation of the acceptance angle of the compound paraboloid, the advantage of short focal length of the paraboloid relative to the arc does not exist; the compound paraboloid condenser blocks part of the light, reducing the concentration Light ratio; the design of a single paraboloid lacks the freedom of design
In the past, these designs corresponded to one heat collecting tube for one bracket, which increased the cost and floor space in most cases.

Method used

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  • Secondary reflection light gathering and heat collecting device with compound curved surface
  • Secondary reflection light gathering and heat collecting device with compound curved surface
  • Secondary reflection light gathering and heat collecting device with compound curved surface

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The trough solar concentrator makes sunlight incident on the receiving surface along the axial direction through the tracking system, and the light falling on the compound arc primary reflector (4) is reflected and converged into the compound parabolic secondary reflector (5) , the angle between the light entering (5) and its axis should be smaller than its maximum acceptance angle during design, and according to the characteristics of the compound parabolic concentrator, all the light will reach the heat collecting tube (1) at last like this. All reflectors and heat collecting tubes are fixed by the support frame (6). The light diagram of the double-pipe reflector with three arcs as the primary reflector (2) and the compound parabolic condenser with an acceptance angle of 30°C as the secondary reflector (3) is as follows figure 2 shown.

Embodiment 2

[0033] The trough solar concentrator makes sunlight incident on the receiving surface along the axial direction through the tracking system, and the light falling on the compound arc primary reflector (4) is reflected and converged into the compound parabolic secondary reflector (5) , the light reaches the heat collecting tube (1) directly or through reflection. All reflectors and heat collecting tubes are fixed by the support frame (6). Two arcs are used as the primary reflector (2). In order to increase the concentration ratio, or to use a plane bracket, the design of the composite circular arc primary reflector (4) can be improved. The design diagram is as follows image 3 , its disadvantage is that there is some light loss in the lighting range.

Embodiment 3

[0035] The trough solar concentrator makes sunlight incident on the receiving surface along the axial direction through the tracking system, and the light falling on the compound arc primary reflector (4) is reflected and converged into the compound parabolic secondary reflector (5) , the light reaches the heat collecting tube (1) directly or through reflection. All reflectors and heat collecting tubes are fixed by the support frame (6). Two arcs are used as the primary reflector (2). In order to save manufacturing cost, the compound circular arc primary reflector (4) can only use one size of arc, but the position of each arc needs to be adjusted. Design drawing such as Figure 4 , the disadvantage is that the concentration ratio is relatively small compared with the design of arcs connected together.

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Abstract

The invention provides a secondary reflection light gathering and heat collecting device with a compound curved surface, which relates to a solar slot type light gathering and heat collecting device and comprises a heat collecting tube (1), a plane primary reflector (2), a refracting plane secondary reflector (3), a compound circular arc primary reflector (4), a compound paraboloid secondary reflector (5) and a supporting frame (6), wherein the heat collecting tube (1) comprises two parallel heat collecting tubes and is positioned in the compound paraboloid secondary reflector (5), and the supporting frame (6) is positioned below the compound circular arc primary reflector (4) and used for fixing the compound circular arc primary reflector (4). By adopting the design of combination of onesupporting frame and two heat collecting tubes, the cost and the height of the heat collecting device can be remarkably reduced; by adopting the compound paraboloid secondary reflector, the requirement on the tracking accuracy is reduced; by adopting the compound circular arc primary reflector, the degree of freedom of the design is increased; and by adopting the design of combination of the planereflector and the refracting plane, the utilization ratio of the light energy is improved.

Description

technical field [0001] The invention relates to a solar trough-type light concentrating and heat collecting device, which is especially applied in solar medium and high temperature systems, and belongs to the technical field of solar energy concentrating and heat collecting. Background technique [0002] In order to obtain high-temperature steam, electric energy, etc., scientific researchers have explored and studied the principle of light concentration in solar energy conversion and utilization, and developed trough solar thermal utilization technology, tower solar thermal utilization technology and dish solar thermal utilization technology. Trough solar thermal utilization technology is the most mature technology among them, and has become the most likely means of replacing conventional energy among all renewable energy technologies. The concentrating heat collector of the conventional trough solar thermal utilization system generally uses a parabolic concentrating mirror ...

Claims

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Application Information

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IPC IPC(8): F24J2/00F24J2/46F24J2/52G02B17/06G02B5/10G02B7/182
CPCY02E10/40Y02E10/47
Inventor 余雷张耀明王军
Owner SOUTHEAST UNIV
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