Linear Fresnel condenser

A linear Fresnel and concentrator technology, applied in the field of solar energy utilization, can solve the problems of affecting the optical efficiency of linear Fresnel solar system, reducing the concentration ratio of secondary reflectors, and high manufacturing costs of vacuum tubes, so as to reduce construction costs. And operation and maintenance costs, reduce heat radiation loss, reduce the effect of heat loss

Inactive Publication Date: 2020-11-20
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, linear Fresnel solar concentrators at home and abroad generally have a layer of glass tubes on the metal heat collecting tube, and the interlayer is a vacuum environment, resulting in a certain distance between the metal heat collecting tube and the secondary reflector, which reduces the secondary reflector. The concentration ratio of the mirror affects the optical efficiency of the linear Fresnel solar system, and the manufacturing cost of the vacuum tube is relatively high, it is easy to break, it is not easy to install and clean, and the operation and maintenance cost is very high
At the same time, because the secondary concentrator has openings, the heat loss is relatively large

Method used

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  • Linear Fresnel condenser
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Experimental program
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Embodiment 1

[0014] Such as figure 1 As shown, the concentrator is composed of a primary reflector 1, a secondary concentrator 2, an insulating layer 3 and a glass cover plate 4 coated with a spectral selective reflection film on the surface; The heat collecting tube 5 and the secondary reflection mirror 6 are composed of a metal heat collecting film with a permanent absorption film.

[0015] The upper layer of the glass cover plate is coated with a spectrally selective reflection film, and its structure is SiO2 from the inside to the outside. 2 layer / AZO layer / Al 2 o 3 Layer / Substrate / SiO 2 The layer is characterized by high transmittance to visible light (T ≥ 90%), mid-infrared reflectivity > 85%, high reflection and low emissivity (ε 100℃ ≤0.10), the width is 440mm. The substrate is made of high borosilicate glass with a thickness of 4mm.

[0016] The shape of the secondary reflector is compound parabolic concentrator (CPC), the arc length of the reflecting surface is 760mm, the m...

Embodiment 2

[0024] In this embodiment, on the basis of Embodiment 1, another spectrally selective reflection film is selected.

[0025] The spectrally selective reflective film on the glass cover, its structure is SiO from the inside to the outside 2 layer / CN layer / Al 2 o 3 Layer / Substrate / SiO 2 layer, which is characterized by high transmittance of visible light (T≥90%), high infrared reflection and low emissivity (ε 100℃ ≤0.10), the width is 440mm. The substrate is made of high borosilicate glass with a thickness of 4mm.

[0026] Compared with ordinary concentrators, the optical efficiency is increased by 8%; the radiation heat loss is reduced by 20%, and the overall heat loss is reduced by 65%. System efficiency increased by 9%.

Embodiment 3

[0028] In this embodiment, on the basis of Embodiment 1, another spectrally selective reflection film is selected.

[0029] The glass cover is coated with a spectrally selective reflection film, and its structure is SiO from the inside to the outside. 2 layer / AZO layer / Al 2 o 3 Layer / Substrate / SiO 2 layer, which is characterized by high transmittance of visible light (T≥90%), high infrared reflection and low emissivity (ε 100℃ ≤0.10), the width is 440mm. The substrate is made of high borosilicate glass with a thickness of 4mm.

[0030] Compared with ordinary concentrators, the optical efficiency is increased by 8%; the radiation heat loss is reduced by 21.2%, and the overall heat loss is reduced by 68.5%. The system efficiency has increased by more than 10%.

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Abstract

The invention discloses a linear Fresnel condenser. The condenser comprises a primary reflecting mirror and a secondary condenser; the secondary condenser is internally provided with a heat collectiontube and a secondary reflecting mirror, wherein the secondary reflecting mirror is externally provided with a thermal insulating layer, a glass cover plate is arranged at an opening, a spectrum selective reflecting film is arranged on the surface of the glass cover plate, and the heat collection tube is a metal tube with the surface coated with a spectrum selective absorbing film; the spectrum selective reflecting film on the glass cover plate is composed of a buffer layer, an infrared reflecting layer, an antireflection layer of visible light and an antireflection film layer; and the inner surface of the glass cover plate is provided with a buffer layer, and an infrared reflecting layer, an antireflection film layer is arranged above the buffer layer or the infrared reflecting layer, andthe outer surface of the glass cover plate is provided with an antireflection layer of visible light. The condenser has the beneficial effects that a glass vacuum tube is eliminated, and no gap installation can be realized; the glass cover plate eliminates convective heat loss; the spectrum selective reflecting film reduces thermal radiation loss; and the cost is rapidly reduced by using the metal tube, and the construction and maintenance costs are significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization and relates to a linear Fresnel type concentrator. Background technique [0002] Solar thermal technology is a mature and widely used new energy technology. Among them, the linear Fresnel solar heat collection technology has been developed in recent years. It has the characteristics of simple structure, low system construction cost, high reliability, less land occupation, and high thermal efficiency, and has broad market application prospects. [0003] At present, linear Fresnel solar concentrators at home and abroad generally have a layer of glass tubes on the metal heat collecting tube, and the interlayer is a vacuum environment, resulting in a certain distance between the metal heat collecting tube and the secondary reflector, which reduces the secondary reflector. The concentration ratio of the mirror affects the optical efficiency of the linear Fresnel solar system, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S23/30F24S23/70F24S10/70
CPCF24S10/70F24S23/30F24S23/70Y02E10/44
Inventor 王成龙王锐东吴泽睿王良璧王薇薇
Owner LANZHOU JIAOTONG UNIV
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