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A transmissive radiation cooling inorganic material

A technology of radiation refrigeration and inorganic materials, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of not considering lighting requirements, many types of materials, and expensive consumables, etc. Fast, low-cost results

Active Publication Date: 2021-11-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic materials are generally easy to degrade, which is relatively limited in outdoor applications
Most radiative refrigeration materials based on inorganic materials have problems such as complex processing, expensive consumables, and many types of materials required.
And the above materials are all reflective structures, without considering the indoor lighting requirements

Method used

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  • A transmissive radiation cooling inorganic material
  • A transmissive radiation cooling inorganic material
  • A transmissive radiation cooling inorganic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, silicon dioxide material is used to design such a figure 1 (a) Impedance-matching material of silica with 2-layer cylindrical structure shown. After being optimized by the algorithm based on the equivalent medium theory, the structural parameters of the N-layer (N=2) silicon dioxide cylinder structure not including the substrate are obtained, the period of the structure p=4 μm, the first layer of silicon dioxide cylinder The duty ratio is 0.9, the radius is 1.8 μm, and the thickness is 0.8 μm; the duty ratio of the second layer of silicon dioxide cylinder is 0.5, the radius is 1 μm, and the thickness is 1.1 μm. Such as image 3 As shown, for the two-layer silica cylinder structure that does not include the substrate, after verification by the CST electromagnetic simulation software, the estimation results of the theoretical design are roughly consistent with the electromagnetic simulation results, confirming that the two-layer silica cylinder can ef...

Embodiment 2

[0031] In this embodiment, for the 8-13 μm band, an ultra-high absorption silicon dioxide structure material is designed to realize the function of the transmissive radiation cooling inorganic material. The thickness of the silicon dioxide substrate is H=400 μm, and the period p=4 μm. The first layer of silica cylinders has a duty ratio of 0.9, a radius of 1.8 μm, and a thickness of 0.8 μm; the second layer of silica cylinders has a duty ratio of 0.5, a radius of 1 μm, and a thickness of 1.1 μm. The structural material has a very high absorption rate in the 8-13 μm wave band. Such as Figure 4 Compared with the silica substrate without the cylindrical structure shown, the absorptivity of the silica structure material near 9 μm is increased from 0.4 to about 0.75, and the overall absorptivity in the 8-13 μm band has been significantly improved. It is proved that by designing the silica cylindrical structure on the silica substrate, the infrared absorption rate in the center c...

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Abstract

The present invention proposes a transmissive radiation cooling inorganic material, including N-layer micro-nano structure and substrate; the transmissive radiation cooling inorganic material adopts a new structural composition, so that the material can maintain a high visible transmittance At the same time, it achieves extremely high mid-infrared absorption, and then realizes the effect of radiation cooling. Wherein, the substrate material is also silicon dioxide, and the N-layer micro-nano structures on the substrate are silicon dioxide structures with different duty ratios. Through the different N-layer silica micro-nano structures, the impedance matching of the material in the mid-infrared band can be enhanced, and the defect of the single-layer silica material in the mid-infrared band due to the impedance mismatch is reduced. While maintaining the high transmittance of visible light, it can greatly improve the absorption rate of mid-infrared. The invention has the advantages of simple material composition, good stability, strong practicability, etc., and can be widely used in the fields of cooling solar cells, enhancing the effect of radiation refrigerators, radiation cooling glass and the like.

Description

technical field [0001] The invention relates to the technical field of radiation refrigeration, in particular to a transmissive radiation refrigeration inorganic material. Background technique [0002] Radiation cooling is a kind of passive cooling. By increasing the emissivity of materials in the 8-13 micron band, this technology can use the atmospheric window to emit thermal radiation to the cold source of the universe to achieve the effect of cooling. The difference between radiant refrigeration and traditional refrigeration methods is that it does not need to consume power resources, and can greatly reduce energy consumption. It is an energy-saving and emission-reducing, green and environmentally friendly refrigeration method. Radiation refrigeration technology has made very good achievements in recent years. A large number of studies have shown that a good radiation refrigeration effect can be achieved by using a structural material composed of a metal and an inorganic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 罗先刚李雄马晓亮蒲明博游鹏
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI