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Selective absorbing coating

An absorption coating, selective technology, applied in the field of solar thermal, which can solve the problems of low heat loss and high absorption performance

Inactive Publication Date: 2013-11-13
北京天普太阳能工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a selective absorption coating with high absorption performance and low heat loss aiming at the defects of existing selective absorption coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] image 3Shown is the embodiment that the selective absorbing coating of the present invention is used on the all-glass vacuum solar collector tube, the glass inner tube 5 of the all-glass vacuum solar collector tube serves as the substrate 1 of the selective absorbing coating, and the metal Layer 2, absorber layer 3, surface dielectric layer 4. The metal layer 2 is attached to the glass inner tube 5 of the all-glass vacuum solar heat collector tube, and the material is copper, and the thickness of the film layer is 100nm. The absorbing layer 3 is made of stainless steel aluminum nitride, and is attached to the metal layer 2 where it can be irradiated or directly irradiated by sunlight. The molar ratio of metal atoms to nitrides or oxides is 0-1, and the film thickness is 100nm; The surface dielectric layer 4 covers the absorbing layer 3 and the exposed metal layer 2, and is made of aluminum nitride with a film thickness of 50 nm. In this embodiment, in order to increa...

Embodiment 2

[0041] Figure 4 It is the application of the selective absorption coating of the present invention on the all-glass heat pipe vacuum solar collector tube 6 . The inner tube of the all-glass heat pipe vacuum solar collector tube 6 acts as a substrate 1, and the bonding layer, metal layer 2, absorber layer 3, and surface dielectric layer 4 are arranged on the outer wall of the inner tube of the all-glass heat pipe vacuum solar collector tube 6. The adhesive layer is made of aluminum and aluminum nitride or oxide, and the film thickness is 20nm; the metal layer 2 is attached to the adhesive layer, and the material is aluminum, and the film thickness is 100nm; the absorption layer 3 is attached to the metal layer 2 The area that can be irradiated or directly irradiated by sunlight is made of aluminum and aluminum nitride or oxide, the metal molar ratio is 0-1, multi-layer arrangement, and the film thickness is 150nm; the surface dielectric layer 4 is set on the absorption layer 3...

Embodiment approach 3

[0043] Figure 5 , Figure 6 It is the application of the selective absorption coating of the present invention on the glass-metal sealed heat pipe 9 . The metal fins 8 of the glass-metal sealed heat pipe 9 act as the substrate 1 of the selective absorption coating, the bonding layer, the metal layer 2, the absorption layer 3, and the surface dielectric layer 4 are arranged on the metal fins 8, and the glass-metal The getter 7 of the metal-sealed heat pipe 9 is arranged on the metal fin 8 . The adhesive layer is made of silicon and silicon nitride or oxide, and the film thickness is 10nm; the metal layer 2 is attached to the adhesive layer, and the material is copper, and the film thickness is 60nm; the absorption layer 3 is attached to the metal layer 2. The side facing the sun is made of stainless steel, the molar ratio of metal atoms to nitrides or oxides is 0-1, and the thickness of the film layer is 100nm; the surface dielectric layer 4 is arranged on the absorption lay...

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Abstract

The invention discloses a selective absorbing coating, which comprises a matrix, a metal layer, an absorption layer and a surface layer dielectric layer, wherein the metal layer, the absorption layer and the surface layer dielectric layer are successively arranged along the direction far away from the matrix; the metal layer is covered on the matrix; an area, which can be subjected to direct solar radiation, of the metal layer is at least covered by the absorption layer; and the absorption layer is at least covered by the surface layer dielectric layer. The selective absorbing coating is suitable for the inner glass tube of an all-glass vacuum solar collector tube, the outer wall of the inner tube of the all-glass vacuum solar collector tube, the metal fin of a glass-metal sealing heat tube and a high temperature resistant condensation tube or the metal plate core of a flat plate heat absorption plate. According to the selective absorbing coating disclosed by the invention, the infrared radiation rate of the absorption layer is far higher than that of the metal layer. On the premise of guaranteeing efficient absorption, the heat loss under the high temperature state is reduced to the greatest extent. When the temperature difference between the inside of a heat collector and the external environment is bigger, the effect on reducing the heat loss by the selective absorbing coating disclosed by the invention is more obvious.

Description

technical field [0001] The invention belongs to the field of solar photothermal technology and relates to a selective absorption coating. Background technique [0002] Solar collector is a kind of renewable energy product with mature technology and wide application. It has been widely used in many countries around the world, and has played a huge role in providing hot water supply, improving people's living standards, and reducing conventional energy consumption. . In my country, Greece, Israel and other countries, solar collectors mainly supply hot water for living and bathing; Hot water, but also for building heating; in the United States, solar collectors are mainly used for swimming pool heating. At present, mature solar collectors mainly include solar vacuum collector tube collectors and flat-plate solar collectors. [0003] The solar vacuum heat collecting tube is the heat collecting element of the solar vacuum heat collecting tube collector, which is a key component...

Claims

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Application Information

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IPC IPC(8): F24J2/48B32B15/04
CPCY02E10/40
Inventor 李峰陈国华王君久陈会祝世国孔维静
Owner 北京天普太阳能工业有限公司
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