CN217226890U - Radiation refrigerating film - Google Patents
Radiation refrigerating film Download PDFInfo
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- CN217226890U CN217226890U CN202220971302.3U CN202220971302U CN217226890U CN 217226890 U CN217226890 U CN 217226890U CN 202220971302 U CN202220971302 U CN 202220971302U CN 217226890 U CN217226890 U CN 217226890U
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Abstract
The utility model discloses a radiation refrigeration film, including radiation refrigeration layer and porous layer, the range upon range of setting of porous layer is in the inboard on radiation refrigeration layer, the material of porous layer includes aerogel material. The utility model discloses set up the porous layer at the inboard (the one side towards the body that is cooled promptly) on radiation refrigeration layer, this porous layer adopts the aerogel to make, on the one hand, aerogel itself can see through infrared radiation to help the body that is cooled to space radiant heat; on the other hand, the high-porosity, high-specific surface area and low-density characteristics of the heat insulation material increase heat transfer paths, so that heat is difficult to reach a cooled body, external parasitic heat increment is effectively prevented from conducting heat conduction and convective heat transfer inwards, the heat is isolated from the outside, and the heat insulation effect is achieved. The refrigeration effect is improved by a composite refrigeration method of porous material heat insulation and passive radiation refrigeration.
Description
Technical Field
The utility model relates to a radiation refrigeration technology field, in particular to radiation refrigeration film.
Background
And (4) radiation refrigeration, namely, a heating object radiates heat outwards to a cold trap of the outside air through an infrared atmospheric window (8-13 microns) to achieve the effects of heat dissipation and temperature reduction. Passive radiative cooling may be used to reduce the amount of energy required to cool the body.
However, for radiation refrigeration in daytime, while heat is radiated to the outside, high emissivity of solar spectrum is required to avoid and reduce temperature rise caused by sunlight irradiation; and due to the temperature difference between the cooling body and the other surroundings, parasitic heat increments are generated, which exchange heat with the cooling body by heat conduction and heat convection, thereby counteracting the heat released by radiative cooling. At present, a common radiation refrigeration film on the market is often easily influenced by the external environment, so that the refrigeration effect is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a radiation refrigeration film, aim at solving current radiation refrigeration film and receive external environment heat transfer easily and lead to the poor problem of refrigeration effect.
In order to achieve the above object, the utility model provides a radiation refrigeration film, radiation refrigeration film includes:
a radiation refrigeration layer; and the number of the first and second groups,
and the porous layer is arranged on the inner side of the radiation refrigerating layer in a laminated mode, and the material of the porous layer comprises aerogel materials.
Optionally, the aerogel material has a porosity of 90-99%; and/or the presence of a gas in the gas,
in the aerogel material, the particle size of aerogel particles is 4-20 nm.
Optionally, the aerogel material comprises silica aerogel or indium tin oxide doped silica aerogel.
Optionally, the material of the radiation refrigerating layer includes a spectrally selective material doped with silicon dioxide.
Optionally, the spectrally selective material comprises any one of zinc sulfide, polyvinyl chloride, barium fluoride, and polyethylene.
Optionally, the radiation-cooling layer is laminated on the outer side of the radiation-cooling layer.
Optionally, the material of the reflective layer includes at least one of silver, aluminum, barium sulfate, calcium titanate, and silicon dioxide.
Optionally, the particle size of the preparation material of the reflecting layer is 0.2-0.5 μm.
Optionally, the porosity of the reflective layer is 50% to 30%.
Optionally, the thickness of the radiation refrigeration film is 2.5-10 mm.
In the technical scheme provided by the utility model, set up the porous layer at the inboard (the one side towards the body that is cooled promptly) on radiation refrigeration layer, this porous layer adopts the aerogel to make, on the one hand, the aerogel itself can see through infrared radiation to help being cooled the body to space radiant heat; on the other hand, the high-porosity, high-specific surface area and low-density characteristics of the heat insulation material increase heat transfer paths, so that heat is difficult to reach a cooled body, external parasitic heat increment is effectively prevented from conducting heat conduction and convective heat transfer inwards, the heat is isolated from the outside, and the heat insulation effect is achieved. The refrigeration effect is improved by a composite refrigeration method of porous material heat insulation and passive radiation refrigeration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a radiation refrigeration film provided by the present invention;
fig. 2 is a schematic structural diagram of another embodiment of a radiation refrigeration film provided by the present invention;
fig. 3 is a flow chart for optimizing the structure of the radiation refrigeration film provided by the present invention;
FIG. 4 is a graph comparing the infrared transmission at 2-20 μm for various spectrally selective materials.
The reference numbers indicate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
3 | |
| 2 | Radiation refrigerating |
4 | Cooled body |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
And (4) radiation refrigeration, namely, a heating object radiates heat outwards to a cold trap of the outside air through an infrared atmospheric window (8-13 microns) to achieve the effects of heat dissipation and temperature reduction. Passive radiative cooling may be used to reduce the amount of energy required to cool the body.
However, for radiation refrigeration in the daytime, while heat is radiated to the outside, high emissivity of the solar spectrum is required to avoid and reduce temperature rise caused by sunlight irradiation; and due to the temperature difference between the cooling body and the other surroundings, parasitic heat increments are generated, which exchange heat with the cooling body by heat conduction and heat convection, thereby counteracting the heat released by radiative cooling. At present, a common radiation refrigeration film on the market is often easily influenced by the external environment, so that the refrigeration effect is poor.
In view of this, the present invention provides a radiation refrigeration film, and fig. 1 to 2 show an embodiment of the radiation refrigeration film. The radiation refrigeration film has good refrigeration and heat insulation effects, is not easily influenced by external environment, and can efficiently solve the problems of large refrigeration energy consumption or incapability of adopting active refrigeration and the problem of refrigeration effect deterioration caused by heat transfer from environment and atmosphere to the refrigeration surface after refrigeration. The application range is wide, and the method can be applied to the fields of public buildings, electronic equipment cooling, base stations, low-temperature storage tank bodies, cold chain transportation and the like. It is to be understood that the cooled body 4 mentioned herein refers to any kind of component to be cooled or insulated, for example, when the present radiation refrigerating film is applied to an electronic device, the cooled body 4 may be the electronic device itself, or a housing of the electronic device, etc.
Referring to fig. 1 and 2, the radiation refrigerating film of the present invention includes a radiation refrigerating layer 2 and a porous layer 3. The radiation refrigeration layer 2 utilizes the characteristic that heat-carrying infrared radiation with specific wavelength can pass through the earth atmosphere unhindered to radiate to the outer space, and can convert the heat of the cooled body 4 into infrared radiation in a limited spectral range, so that the heat exchange with the outer space with extremely low temperature is realized, and the cooling is realized. For convenience of description, a state in which the present radiation refrigerating film is coated on the surface of the object to be cooled 4 is taken as an example, in this state, the side of the radiation refrigerating layer 2 facing the object to be cooled 4 is set as the inner side thereof, and the side of the radiation refrigerating layer 2 facing away from the object to be cooled 4 is set as the outer side thereof. In this embodiment, the porous layer 3 is stacked inside the radiation refrigerating layer 2, and the material of the porous layer 3 includes aerogel material; aerogel is a nano-scale porous solid material with high porosity, low density and high specific surface area.
In the technical scheme provided by the utility model, set up porous layer 3 in the inboard (i.e. towards the one side of cooled body 4) of radiation refrigeration layer 2, this porous layer 3 adopts the aerogel to make, on the one hand, aerogel itself can see through infrared radiation to help cooled body 4 to space radiant heat; on the other hand, the high porosity, the high specific surface area and the low density of the heat insulation material increase the heat transfer path, so that the heat is difficult to reach the cooled body 4, the external parasitic heat increment is effectively prevented from conducting heat and convecting heat inwards, the heat is isolated from the outside, and the heat insulation effect is achieved. The refrigeration effect is improved by a composite refrigeration method of porous material heat insulation and passive radiation refrigeration.
In addition, the radiation refrigeration film also comprises a reflecting layer 1, and the reflecting layer 1 is arranged on the outer side of the radiation refrigeration layer 2 in a laminated mode. The reflecting layer 1 can be made of any common reflecting material on the market, and the reflecting layer 1 can increase the reflectivity of sunlight so as to reduce the absorption of solar radiation.
Based on the film layer structure provided by the above embodiment, in practical application, the radiation refrigeration film can be further structurally optimized in terms of material selection, particle concentration (1-porosity), film thickness and the like. Referring to fig. 3, in the specific operation, different materials, particle concentrations and film thicknesses can be selected for simulation, after the simulation result is verified to be correct through comparison with the experimental result, whether the simulation result reaches the standard is judged according to the following standard, if the simulation result does not reach the standard, the combination is excluded, and if the simulation result reaches the standard, various parameters of the combination are recorded; and finally, screening out a better parameter selection range from the qualified multiple combinations. Wherein, the judgment standard is as follows: the radiation cooling power P of the radiation refrigeration film is larger than 0, the infrared emissivity is larger than 0.7, the solar reflectivity is larger than 0.9, and the transmittance is 90-95%.
Specifically, the porous layer 3 may be made of aerogel of any material. In some embodiments, the aerogel material preferably has a porosity of 90% to 99%, for example, the selected aerogel material may have a porosity of 90%, 91%, 92%, 95%, 96.3%, 97.2%, 98%, 98.5%, 99%, etc., and the porous layer 3 made of the aerogel material in this range has a lower thermal conductivity, can extend the heat transfer path approximately infinitely, and has a better effect of blocking external heat. In other embodiments, the aerogel material is adopted, wherein the particle size of the aerogel particles is 4-20 nm, so that the infrared radiation can be transmitted, and the radiation heat of the cooled body 4 to the space can be improved.
It can be understood that, as preferred, the porosity can be selected for use and is 90 ~ 99%, and the particle diameter of aerogel granule is aerogel material preparation porous layer 3 of 4 ~ 20nm, so, can improve by cooling body 4 to space radiant heat, can promote thermal-insulated effect again.
Specifically, the aerogel material can be silica aerogel, indium tin oxide doped silica aerogel, and compared with the prior art, the aerogel made of the two materials is not only easy to obtain, but also has better heat insulation performance and light transmittance, and can block external heat and be beneficial to the outward radiation of the cooled body 4.
During practical application, the metamaterial of arbitrary radiation refrigeration can be chooseed for use to the material of making of radiation refrigeration layer 2, for example, polyethylene terephthalate, polyvinyl fluoride etc. to this, the utility model discloses do not do the injeciton. In this embodiment, the radiation refrigerating layer 2 is a doped aerogel layer, and the material thereof includes a spectrally selective material doped with silica. The spectrally selective material is a material that selectively absorbs sunlight and transmits infrared radiation, and examples thereof include PEI (polyethyleneimine), PVC (polyvinyl chloride), PS (polystyrene), PMMA (polymethyl methacrylate), ZnS (zinc sulfide), PE (polyethylene), and BaF 2 (barium fluoride), BaSO 4 (barium sulfate), CaCO 3 (calcium carbonate), ITO (indium tin oxide), and the like. The spectrum selective material can transfer the heat inside (the cooled body 4) to the outside in the form of infrared radiation to exchange heat with space; meanwhile, the aerogel porous structure can play a roleGood heat insulation effect; in addition, the silicon dioxide has higher infrared emissivity, and the doping of the silicon dioxide in the spectrum selective material can further enhance the infrared emission and the sunlight reflection and enhance the radiation refrigeration performance. This embodiment radiation cooling layer had both had high cooling power, still possessed low thermal conductivity simultaneously, and the radiation cooling is effectual.
Further, the spectrally selective material comprises any one of zinc sulfide, polyvinyl chloride, barium fluoride, and polyethylene. The material with the particle size of 50nm is prepared into a film layer with the porosity of 95% and the thickness of 5mm, and then infrared transmittance detection is carried out, and the result is shown in fig. 4, zinc sulfide, polyvinyl chloride, barium fluoride and polyethylene show better infrared transmittance at 2-20 μm, on the basis that the spectrum selective material is preferably any one of zinc sulfide, polyvinyl chloride, barium fluoride and polyethylene, and the cooling effect of the radiation refrigeration film can be further improved.
The material of the reflective layer 1 is preferably silver, aluminum, barium sulfate, calcium titanate (CaTiO) 3 ) And at least one of silicon dioxide, the material has high solar reflectivity, and the cooling effect of the film is further improved.
In addition, in view of the fact that the larger the particle size, the stronger the scattering effect, resulting in the smaller the reflection intensity at short wavelengths, in some embodiments, the particle size of the preparation material of the reflective layer 1 is 0.2 to 0.5 μm, within which the reflective layer 1 has the best reflection effect. Further, the particle diameter of the preparation material of the reflective layer 1 is preferably 0.4 μm.
In some embodiments, the porosity of the reflective layer 1 is 50% to 30%, i.e. the particle concentration (corresponding to 1-porosity) of the reflective layer 1 is 50% to 70%. Further, the particle concentration of the reflecting layer 1 is preferably 60%, so that the reflectivity of sunlight can reach more than 90%, and the internal small hole structure can realize high reverse heat dissipation on direct irradiation and scattering of sunlight, so that the cooled body 4 is prevented from being heated by solar radiation heat, and the cooling effect of the film is further improved.
In addition, the thickness of the radiation refrigeration film is 2.5-10 mm, for example, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm and the like. Considering that the infrared emissivity of material can reach the saturation along with the increase of thickness, in this embodiment, the thickness of radiation refrigeration film is 2.5 ~ 10mm, so, can improve infrared emissivity, improve the heat-proof quality, can avoid extravagant material again, increase cost.
The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereby, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A radiation chilling membrane, comprising:
a radiation refrigeration layer; and (c) a second step of,
and the porous layer is arranged on the inner side of the radiation refrigerating layer in a laminated mode, and the material of the porous layer comprises aerogel materials.
2. The radiation-cooled film of claim 1, wherein the aerogel material has a porosity of 90% to 99%; and/or the presence of a gas in the gas,
in the aerogel material, the particle size of aerogel particles is 4-20 nm.
3. A radiation-cooled film according to claim 1, wherein the aerogel material comprises silica aerogel or indium tin oxide doped silica aerogel.
4. The radiation chilling film of claim 1, wherein the material of the radiation chilling layer comprises a spectrally selective material doped silica.
5. A radiation chilling film according to claim 4, wherein said spectrally selective material comprises any one of zinc sulfide, polyvinyl chloride, barium fluoride and polyethylene.
6. A radiation refrigerating film according to claim 1 further comprising a reflective layer disposed in a stack on the outside of said radiation refrigerating layer.
7. A radiation refrigerating film as recited in claim 6, wherein a material of said reflecting layer includes at least one of silver, aluminum, barium sulfate, calcium titanate, and silica.
8. A radiation refrigerating film according to claim 6, wherein said reflecting layer is made of a material having a particle size of 0.2 to 0.5 μm.
9. A radiation chilling film according to claim 6, wherein said reflective layer has a porosity of 50% to 30%.
10. A radiation refrigerating film as recited in claim 1, wherein said radiation refrigerating film has a thickness of 2.5 to 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220971302.3U CN217226890U (en) | 2022-04-25 | 2022-04-25 | Radiation refrigerating film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220971302.3U CN217226890U (en) | 2022-04-25 | 2022-04-25 | Radiation refrigerating film |
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| Publication Number | Publication Date |
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| CN217226890U true CN217226890U (en) | 2022-08-19 |
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| CN202220971302.3U Active CN217226890U (en) | 2022-04-25 | 2022-04-25 | Radiation refrigerating film |
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