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High-performance solar spectrum selective heat absorber suitable for wide temperature range

A solar energy, high-performance technology, applied in solar energy utilization technology and its application field, can solve the problems that cannot meet the application of photothermal conversion system, easy to be oxidized and corroded, inconvenient to construct, etc., achieve simple structure, realize selective absorption, strengthen absorption effect

Pending Publication Date: 2022-05-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally some defects and deficiencies in the existing solar spectrum heat absorbers
For example: the use of precious metal materials such as gold and silver cannot withstand high temperatures and is easily oxidized and corroded; it can only be used in a fixed temperature range and cannot meet a wide range of light-to-heat conversion systems; the structure is complex and inconvenient to construct, etc.

Method used

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  • High-performance solar spectrum selective heat absorber suitable for wide temperature range
  • High-performance solar spectrum selective heat absorber suitable for wide temperature range
  • High-performance solar spectrum selective heat absorber suitable for wide temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, in this embodiment, the material of the bottom metal thin layer 1 is tungsten, and the thickness is 150 nm; the metal regular triangular prisms 2 are regularly arranged on the bottom metal thin layer 1, and its height is 800 nm, and the material used is tungsten, metal The regular hexagonal optical microcavity surrounded by regular triangular prisms has a side length of 100 nm, and is filled with dielectric filler 3, which is silicon dioxide; finally, the entire solar heat absorber is covered with a top dielectric thin layer 4, whose thickness The value is 70 nm and the material is silicon dioxide. The finite element method is used to solve Maxwell's equations, and the electromagnetic field when the incident light of sunlight 5 is irradiated on the solar spectrum selective heat absorber of the present embodiment is obtained, and the structure of this invention is obtained when the atmospheric mass is AM1.5. Change with wavelength The spectral ab...

Embodiment 2

[0050] The structure and materials of this embodiment are the same as those of Embodiment 1. The thickness of the bottom metal thin layer 1 is 200 nm, the height of the metal regular triangular prism 2 is 500 nm, and the side length of the regular hexagonal optical microcavity enclosed by the metal regular triangular prism is 40 nm, the top dielectric thin layer 4 covered by the uppermost layer has a thickness value of 70 nm. Embodiment 2 Under the standard of air quality AM1.5, the absorption rate of the solar spectrum (α AM1.5 ) values ​​up to 0.9504. At this time, the solar spectrum selective heat absorber based on the structural parameters of Example 2 can realize that when the system temperature is 673K, the ambient temperature is 300K, and the solar concentration ratio is 100, the photothermal conversion efficiency is 94.07%; when the system temperature is 873K , when the ambient temperature is 300K, the solar concentration ratio is 1000, the photothermal conversion eff...

Embodiment 3

[0052] The structure and materials of this embodiment are the same as those of Embodiment 1. The thickness of the metal thin layer 1 at the bottom is 150 nm, the height of the metal regular triangular prism 2 is 1000 nm, and the side length of the regular hexagonal optical microcavity enclosed by the metal regular triangular prism is 100 nm, the top dielectric thin layer 4 covered by the uppermost layer has a thickness value of 70 nm. Embodiment 3 Under the standard of air quality AM1.5, the solar spectrum absorptivity (α AM1.5 ) values ​​up to 0.9624. At this time, the solar spectrum selective heat absorber based on the structural parameters of Example 3 can realize that when the system temperature is 673K, the ambient temperature is 300K, and the solar concentration ratio is 100, the photothermal conversion efficiency is 95.2%; when the system temperature is 873K , when the ambient temperature is 300K, the solar concentration ratio is 1000, the photothermal conversion effic...

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Abstract

The invention discloses a high-performance solar spectrum selective heat absorber suitable for a wide temperature range, which can keep high solar spectrum absorptivity and photo-thermal conversion efficiency when being applied to a solar energy-heat energy conversion system in a temperature range of 673-1573K to capture solar energy, is simple in structure, and comprises a bottom metal thin layer, a plurality of metal regular triangular prisms are arranged on the bottom metal thin layer, and the lower surfaces of the metal regular triangular prisms cling to the upper surface of the bottom metal thin layer; six adjacent metal regular triangular prisms enclose to form an optical micro-cavity with a regular hexagonal cross section, and each optical micro-cavity is filled with a dielectric filler; the top of the metal regular triangular prism and the top of the optical microcavity are covered with a top dielectric thin layer, the bottom metal thin layer and the metal regular triangular prism are both made of high-melting-point metal materials with the melting point exceeding 1973K, and the dielectric filler and the top dielectric thin layer are both made of high-melting-point dielectrics with the melting point exceeding 1973K.

Description

technical field [0001] The invention relates to a solar energy utilization technology and its application field, in particular to a high-performance solar energy spectrum selective heat absorber suitable for a wide temperature range. Background technique [0002] Excessive use of fossil energy has brought a lot of environmental problems such as the greenhouse effect and extreme weather, and is facing the crisis of depleting storage capacity. As a clean and renewable energy, solar energy is an effective way to solve the environmental and energy crisis through efficient and scientific utilization. Capturing solar energy is an extremely critical step in solar energy utilization in the temperature range of 673-1573K, such as building heating, thermal photovoltaic power generation and solar thermal power generation. The solar spectral selective heat absorber is an optical device that can strongly absorb sunlight after the micro-nano structure adjustment on the surface of the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S70/12F24S70/60G02B5/00G02B1/14
CPCF24S70/12F24S70/60G02B5/003G02B5/008G02B1/14F24S2070/62Y02E10/40
Inventor 胡佐新李庆邱羽徐明攀王济康
Owner CENT SOUTH UNIV
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