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Solar selective absorption coating

An absorption coating and selective technology, applied in the field of solar energy, can solve the problems of cumbersome debugging process, achieve the effect of excellent absorption ratio, increase absorption, and simplify debugging procedures

Active Publication Date: 2012-09-05
HIMIN SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to obtain the best optical performance, there are many choices for the metal content of each absorbing layer, and there are also many choices for the thickness of the film layer, so the debugging process is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: The solar energy selective absorbing coating that the cermet absorbing layer is 4 layers

[0042] Deposition of AIN / Cu / AIN / SS-AIN / SS-AIN / AIN solar selective absorber coatings on glass tubes. For specific film structure, see figure 1 Schematic diagram of solar selective absorbing coating structure and figure 2 Schematic diagram of the change of metal volume content from the surface layer to the interior of the solar selective absorbing coating (four absorbing layers).

[0043] Such as figure 1 , figure 2 As shown, a solar selective absorbing coating is composed of a bonding layer, an infrared reflective layer, a diffusion barrier layer, a high cermet absorbing layer, a low cermet absorbing layer and an anti-reflection layer, and the absorbing layer is composed of a cermet The absorption layer is composed of a composite material film composed of ceramics doped with metal particles.

[0044] The anti-reflection layer is made up of transmissive ceramic ...

Embodiment 2

[0059] Embodiment 2: The solar energy selective absorbing coating that the cermet absorbing layer is 2 layers

[0060] Deposition of AIN / Cu / AIN / SS-AIN / SS-AIN / AIN solar selective absorber coatings on glass tubes. The coating is basically the same as Example 1, and the specific film structure is shown in image 3 Schematic diagram of the change in metal volume content of the solar selective absorbing coating from the surface layer to the interior. In this example, n is equal to 1, and m is equal to 1, that is, there is only one high cermet absorption layer and one low cermet absorption layer. This example is compared with example 1, only absorbing layer is different, and example 1 has two layers of high cermet absorbing layers, two layers of low cermet absorbing layers, and this example has one layer respectively for high and low metal absorbing layers. The rest of the film structure is exactly the same, and the process parameters are also basically the same. Therefore, this ...

Embodiment 3

[0066] Deposition of AIN / Cu / AIN / SS-AIN / SS-AIN / AIN solar selective absorber coatings on glass tubes. This example is compared with example 1, only absorbing layer is different, and example 1 has two layers of high cermet absorbing layers, two layers of low cermet absorbing layers, and this example has multiple layers respectively for high and low cermet absorbing layers. For specific film structure, see image 3 Schematic diagram of the change in metal volume content of the solar selective absorbing coating from the surface layer to the interior. In this example, n is equal to 24, that is, it contains 24 sublayers of the low cermet absorption layer, and m is equal to 18, that is, it contains 18 sublayers of the high cermet absorption layer. The rest of the film structure is exactly the same as Example 1, and will not be described in detail.

[0067] This example uses a circular coating chamber, the specific structure see Figure 6 Schematic diagram of the distance between th...

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Abstract

The invention discloses a solar selective absorption coating comprising a bonding layer, an infrared reflection layer, a diffusion stopping layer, an absorption layer and an antireflection layer, wherein the absorption layer is formed by at least two layers of metal ceramic absorption layers; the at least two layers of metal ceramic absorption layers are composite material thin films formed by doping metal atoms in ceramic; the middle metal volume content in a film layer is the highest and the metal volume content is gradually reduced from middle to two boundary directions; and the metal volume content between the adjacent two metal ceramic absorption layers with different average metal volume contents has an obvious interface. Compared with gradually-changed type and interference type solar selective absorption coatings, the metal volumes of the absorption layers are gradually changed and have the characteristic that the gradually-changed type solar selective absorption coating can easily absorb a solar spectrum; and meanwhile, the obvious interface exists between the absorption layers, the absorption layers have phase interference of lights, and the sunlight absorption is increased.

Description

technical field [0001] The patent of the invention belongs to the field of solar energy, in particular to a solar selective absorption coating. Background technique [0002] The solar energy selective absorption coating is deposited on the solar collector tube, and the light-to-heat conversion efficiency of the solar collector tube is In the formula, B is the light transmittance of the outer glass tube (generally 0.91), α is the solar absorption ratio of the coating, ε eff is the effective heat emission ratio of the collector tube, which is determined by the heat emission ratio ε of the coating and the heat emission ratio of the outer glass tube. It is determined by the refractive index and extinction coefficient of the material in the infrared region. σ is the Stefan-Boltzmann constant (5.67×10 -8 W / m 2 ·K 4 ), T 1 and T 2 are the temperature of the inner tube and the outer tube of the heat collecting tube (K), C is the concentration coefficient, and I is the total ...

Claims

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Application Information

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IPC IPC(8): B32B18/00F24J2/48
CPCF24S70/225F24S70/25F24S70/30Y02E10/40
Inventor 孟秀清
Owner HIMIN SOLAR
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