Passive radiation cooling composite film

A composite material film, radiation cooling technology, applied in the cooling field, can solve the problems of complex structure, unsuitable for batch industrial production and application, and achieve the effect of not consuming external energy and being environmentally friendly

Inactive Publication Date: 2021-03-09
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure can achieve a reflectivity of 95% in the solar spectrum band, and at the same time has a high infrared emissivity in the specific "atmospheric window" band with a wavelength of 8-13 μm, but the structure is complex and not suitable for mass industrial production and application

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0024] This embodiment provides a passive radiation cooling composite material film, its structure is as follows figure 1 shown. In this embodiment, the two-dimensional pyramid optical microstructure unit 3 is first prepared on a single crystal silicon substrate by chemical vapor deposition and ion etching techniques known in the art, and then obtained by nanoimprinting technology known in the art. Infrared light-emitting layer of methylsiloxane 2 . The optical microstructure unit 3 on the infrared light-emitting layer 2 is a two-dimensional pyramid optical microstructure unit 3. By adjusting the preparation process parameters, the period of the two-dimensional pyramid optical microstructure unit 3 is 8 μm, polydimethylsiloxane The thickness (H2) of the infrared light emitting layer 2 is 15 μm, the depth of the pyramid grooves (H3) is 5 μm, and the duty ratio of the pyramid optical microstructure unit 3 is 0.9. Then, a layer of planar metal reflector 1 with a thickness (H1) ...

Embodiment approach 2

[0026] This embodiment provides a passive radiation cooling composite material film, its structure is as follows image 3 shown. In this embodiment, firstly, the one-dimensional microcylindrical lens optical microstructure unit 3 is prepared on the photoresist by using the photolithography technology and hot melt technology known in the art, and then the nanoimprinting technology known in the art is used to obtain the The infrared light emitting layer 2 of methyl siloxane, at this time, the one-dimensional microcylindrical lens optical microstructure unit 3 provided on the upper surface of the infrared light emitting layer 2 is obtained by copying and transferring from the photoresist. By adjusting the preparation process parameters, the period of the optical microstructure unit 3 of the one-dimensional microcylindrical lens is 3 μm, the thickness (H2) of the infrared light emitting layer 2 of polydimethylsiloxane is 4.5 μm, and the groove depth of the microcylindrical lens ( ...

Embodiment approach 3

[0028] This embodiment provides a passive radiation cooling composite material film, its structure is as follows Figure 5 shown. In this embodiment, firstly, the two-dimensional rectangular columnar optical microstructure unit 3 is prepared on the surface of the photoresist by using the double-beam interference lithography technique known in the art. Then, the two-dimensional cuboid column optical microstructure unit 3 on the surface of the photoresist is replicated and transferred to polydimethylsiloxane by soft nanoimprint lithography technology, thereby preparing the infrared light emitting layer 2 . By adjusting the preparation process parameters, the period of the two-dimensional cuboid column optical microstructure unit 3 is 3 μm, the thickness (H2) of the infrared light emitting layer 2 is 13 μm, and the depth of the cuboid column groove (H3) is 8 μm. The cuboid column optical microstructure unit 3 has a duty cycle of 0.7. Finally, a layer of planar metal reflector / 1...

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Abstract

The invention relates to the technical field of cooling and discloses a passive radiation cooling composite film. The passive radiation cooling composite film comprises a planar metal reflecting layer(1) and an infrared light emitting layer (2) made of polydimethylsiloxane, and the planar metal reflecting layer and the infrared light emitting layer are sequentially arranged from bottom to top; and a one-dimensional or two-dimensional micron-scale optical microstructure unit (3) is arranged on the upper surface of the infrared light emitting layer (2). Compared with the prior art, in the filmdisclosed by the invention, when infrared light passes through the infrared light emitting layer, the infrared light emitting layer has relatively high infrared emissivity, so that heat can be radiated to an external cosmic space through an 'atmospheric window ' of a specific waveband of 8-13 microns as much as possible; and meanwhile, most of incident sunlight is reflected by the planar metal reflecting layer, so that the radiation cooling effect is achieved. The passive radiation cooling composite film has the advantages of flexibility, foldability, ultra-thinness, no consumption of externalenergy, environmental friendliness, green sustainable development and the like, and can be applied to electronic equipment, mechanical equipment and other occasions where active cooling means cannotbe adopted.

Description

technical field [0001] The invention relates to the technical field of cooling, in particular to a passive radiation cooling composite material film. Background technique [0002] For the earth, the outer space is a huge cold source, and its temperature is close to absolute zero. According to the classic second law of thermodynamics: heat is always spontaneously transferred from a higher temperature object to a lower temperature object, and this process is irreversible. Although the temperature of the outer space is much lower than that of the objects on the surface of the earth, when the objects dissipate heat outward, they will be hindered by the atmosphere. Water vapor, titanium dioxide, nitric oxide, etc. The infrared ray has a strong absorption effect, and will be retransmitted to the ground in the form of thermal radiation, hindering the radiative cooling process of surface objects to dissipate heat outward. But for some specific wavebands, the atmosphere basically d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B23/00
CPCF25B23/003
Inventor 梁智勇黄浩云周雷周广宏南峰于彦龙
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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