CN112460836A - Passive radiation cooling composite material film - Google Patents
Passive radiation cooling composite material film Download PDFInfo
- Publication number
- CN112460836A CN112460836A CN202011287551.2A CN202011287551A CN112460836A CN 112460836 A CN112460836 A CN 112460836A CN 202011287551 A CN202011287551 A CN 202011287551A CN 112460836 A CN112460836 A CN 112460836A
- Authority
- CN
- China
- Prior art keywords
- infrared light
- light emitting
- emitting layer
- passive
- radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
- F25B23/003—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect using selective radiation effect
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of cooling, and discloses a passive radiation cooling composite material film which comprises a planar metal reflecting layer (1) and an infrared light emitting layer (2) made of polydimethylsiloxane, wherein the planar metal reflecting layer and the infrared light emitting layer are sequentially arranged from bottom to top, and one-dimensional or two-dimensional micrometer-scale optical microstructure units (3) are arranged on the upper surface of the infrared light emitting layer (2). Compared with the prior art, in the film, when infrared light passes through the infrared light emitting layer, the infrared light emitting layer has higher infrared emissivity, so that heat can be radiated to external space through an 'atmospheric window' with a specific waveband of 8-13 mu m as much as possible, and meanwhile, most incident sunlight is reflected by the planar metal reflecting layer, thereby achieving the effect of radiation cooling. The invention has the advantages of flexibility, winding and folding, ultra-thinness, no consumption of external energy, environmental protection, green sustainable development and the like, and can be applied to occasions such as electronic equipment, mechanical equipment and the like which can not adopt active cooling means.
Description
Technical Field
The invention relates to the technical field of cooling, in particular to a passive radiation cooling composite material film.
Background
External cosmonautic space is a huge cold source to the earth, with temperatures near absolute zero. According to the second law of thermodynamics: heat is always transferred spontaneously from the object at a higher temperature to the object at a lower temperature, and the process is irreversible. Although the temperature of the external space is far lower than that of the objects on the earth surface, when the objects radiate heat outwards, the objects are hindered by the atmosphere, and water vapor, titanium dioxide, nitric oxide and the like in the atmosphere have a strong absorption effect on infrared rays emitted by the objects on the earth surface after radiating heat outwards, and the infrared rays are transmitted to the ground again in a heat radiation mode, so that the radiation cooling process of radiating heat outwards by the objects on the earth surface is hindered. However, for certain specific wavebands, the atmosphere is substantially non-absorbing, that is, infrared light can be mostly transmitted without absorption, which is beneficial for the ground object to dissipate heat to the outer space. Among them, the infrared ray in a specific wavelength band of 8-13 μm has the strongest transmittance, and most of the infrared ray in the wavelength band can directly transmit the atmosphere without being absorbed by the atmosphere, and the specific wavelength band is called as an "atmospheric window". Meanwhile, the solar spectrum can be absorbed by the earth surface objects in the wave band of 0.3-2.5 μm to generate heat. Therefore, to achieve passive radiative cooling, the object must have a high ir emissivity in the specific 8-13 μm band, while also requiring a high reflection of the solar spectrum in order to achieve passive radiative cooling. Compared with traditional active cooling such as air conditioning and electric fan cooling, passive radiation cooling does not consume external energy, is environment-friendly, and has the advantages of green sustainable development and the like.
Chinese patent of invention (CN 109631409A) "passive radiation cooling structure and cooling method with high temperature resistance and high infrared emission" discloses a passive cooling structure composed of heat transfer material, cooling material layer, heat insulation wall layer and cover layer. The patent can realize passive radiation cooling, but the cooling material layer of the planar structure of the patent utilizes the absorption characteristic of the material, does not relate to resonance absorption of the optical microstructure appearance, and the composition and the structural appearance of the composite material are completely different from those of the invention.
The scientific and technical literature "ultra broadband structures to achieve high-performance and reactive chemical co-firing" (Nano Letters, 2013, 13(4): 1457-. The structure can realize the reflectivity of 95% of a solar spectrum waveband, and has higher infrared emissivity in a specific 'atmospheric window' waveband with the wavelength of 8-13 mu m, but the structure is complex and is not suitable for batch industrial production and application.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a passive radiation cooling composite material film, which realizes passive radiation cooling.
The technical scheme is as follows: the invention provides a passive radiation cooling composite material film, which is characterized in that: the infrared light emitting device comprises a planar metal reflecting layer and an infrared light emitting layer made of polydimethylsiloxane, wherein the planar metal reflecting layer and the infrared light emitting layer are sequentially arranged from bottom to top, and one-dimensional or two-dimensional micrometer-scale optical microstructure units are arranged on the upper surface of the infrared light emitting layer.
Furthermore, the planar metal reflecting layer is made of Al, Ag or Ni.
Further, the thickness H of the planar metal reflecting layer1Is 100-200 nm.
Further, the thickness H of the infrared light emitting layer2Is 5-15 μm.
Further, the arrangement mode of the optical microstructure units is periodic arrangement or quasi-periodic arrangement.
Further, the shape of the optical microstructure unit is a two-dimensional micron pyramid, a two-dimensional micron cylinder, a two-dimensional micron hemisphere, a two-dimensional rectangular column, a one-dimensional micron triangular prism or a one-dimensional micron rectangular column.
Further, the period of the optical microstructure unit is 3-8 μm, and the groove depth H33-10 μm, and duty ratio of 0.5-0.9.
The invention principle is as follows: the composite material film is contacted with an object to be cooled, the plane metal reflecting layer of the composite material film transfers heat to the infrared light emitting layer, meanwhile, the plane reflecting layer reflects incident sunlight back to prevent the cooled object from being heated by solar spectrum, the infrared light emitting layer synchronously emits the heat in a specific waveband of 8-13 mu m, and the heat enters external space through an atmospheric window without being shielded, so that the cooling effect is realized.
Has the advantages that: compared with the prior art, in the passive radiation cooling composite film, when infrared light passes through the infrared light emitting layer, the infrared light emitting layer has higher infrared emissivity, so that heat can be radiated to an external space through an atmospheric window with a specific waveband of 8-13 microns as much as possible, and meanwhile, most incident sunlight is reflected by the planar metal reflecting layer, so that the radiation cooling effect is achieved.
The passive radiation cooling composite material film has the advantages of flexibility, winding and folding, ultrathin property, no consumption of external energy, environmental friendliness, green sustainable development and the like, and can be applied to occasions such as buildings, electronic equipment, mechanical equipment and the like which cannot adopt an active cooling means.
Drawings
FIG. 1 is a schematic view of a passive radiation-cooled composite film structure according to embodiment 1;
FIG. 2 is an infrared emissivity curve of embodiment 1;
FIG. 3 is a schematic view of a passive radiation-cooled composite film structure of embodiment 2;
FIG. 4 is an infrared emissivity curve of embodiment 2;
FIG. 5 is a schematic view of a passive radiation-cooled composite film structure of embodiment 3;
fig. 6 is an infrared emissivity curve of embodiment 3.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Embodiment 1:
the present embodiment provides a passive radiation-cooled composite film, which is structured as shown in fig. 1. In this embodiment, first, a two-dimensional pyramid optical microstructure unit 3 is prepared on a single-crystal silicon substrate by using chemical vapor deposition and ion etching techniques known in the art, and then an infrared light emitting layer 2 made of polydimethylsiloxane is obtained by using a nanoimprint technique known in the art. The optical microstructure units 3 on the infrared light emitting layer 2 are two-dimensional pyramid optical microstructure units 3, and the period of the two-dimensional pyramid optical microstructure units 3 is 8 μm, the thickness (H2) of the infrared light emitting layer 2 of polydimethylsiloxane is 15 μm, the depth (H3) of the pyramid groove is 5 μm, and the duty ratio of the pyramid optical microstructure units 3 is 0.9 by regulating and controlling preparation process parameters. Then, a layer of planar metal reflection 1 with a thickness (H1) of 100 nm and made of metal Al is deposited on the bottom of the infrared light emitting layer 2 by a thermal evaporation method known in the art. When infrared light passes through the infrared light emitting layer 2, since the infrared light emitting layer 2 has a high infrared emissivity (as shown in fig. 2, the average infrared emissivity in a specific wavelength band of 8-13 μm is 85.6%), heat can be radiated outwards through an "atmospheric window" of the specific wavelength band as much as possible, and meanwhile, most incident sunlight is reflected by the planar metal reflecting layer 1, thereby achieving the effect of radiation cooling.
Embodiment 2:
the present embodiment provides a passive radiation-cooled composite film, the structure of which is shown in fig. 3. In this embodiment, a one-dimensional micro-cylindrical lens optical microstructure unit 3 is first prepared on a photoresist by using a photolithography technique and a hot-melt technique known in the art, and then an infrared light emitting layer 2 made of polydimethylsiloxane is obtained by using a nanoimprint technique known in the art, at this time, the one-dimensional micro-cylindrical lens optical microstructure unit 3 disposed on the upper surface of the infrared light emitting layer 2 is obtained by copying and transferring from the photoresist. By regulating and controlling preparation process parameters, the period of the one-dimensional micro-cylindrical lens optical microstructure unit 3 is 3 microns, the thickness (H2) of the infrared light emitting layer 2 of polydimethylsiloxane is 4.5 microns, the groove depth (H3) of the micro-cylindrical lens is 1.5 microns, and the duty ratio of the micro-cylindrical lens optical microstructure unit 3 is 0.6. Then, a planar metal reflecting layer 1 with the thickness of 200 nm and made of metal Ag is deposited at the bottom of the infrared light emitting layer 2 by a magnetron sputtering method known in the art. Also, when infrared light passes through the infrared light emitting layer 2, since the infrared light emitting layer 2 has a high infrared emissivity (as shown in fig. 4, the average infrared emissivity in a specific wavelength band of 8 to 13 μm is 88.7%), a radiation cooling effect is achieved.
Embodiment 3:
the present embodiment provides a passive radiation-cooled composite film, the structure of which is shown in fig. 5. In the present embodiment, a two-dimensional rectangular prism optical microstructure unit 3 is first prepared on the surface of a photoresist by using a two-beam interference lithography technique known in the art. Then, the two-dimensional rectangular prism optical microstructure units 3 on the surface of the photoresist are copied and transferred to polydimethylsiloxane through a soft nano-imprint lithography technology, so that the infrared light emitting layer 2 is prepared. By regulating and controlling preparation process parameters, the period of the two-dimensional rectangular prism optical microstructure unit 3 is 3 micrometers, the thickness (H2) of the infrared light emitting layer 2 is 13 micrometers, the groove depth (H3) of the rectangular prism is 8 micrometers, and the duty ratio of the rectangular prism optical microstructure unit 3 is 0.7. Finally, a layer of planar metal reflection/1 with the thickness of 150 nm and the material of metal Ni is deposited at the bottom of the infrared light emitting layer 2 by a magnetron sputtering method known in the art. In this example, as shown in FIG. 6, the average emissivity in the infrared is 88.2% at the "atmospheric window" of a specific wavelength band of 8-13 μm, and the radiative cooling effect is also achieved.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A passive radiation cooled composite film characterized by: the infrared light emitting device comprises a planar metal reflecting layer (1) and an infrared light emitting layer (2) made of polydimethylsiloxane, wherein the planar metal reflecting layer (1) and the infrared light emitting layer (2) are sequentially arranged from bottom to top, and one-dimensional or two-dimensional micrometer-scale optical microstructure units (3) are arranged on the upper surface of the infrared light emitting layer (2).
2. The passive, radiation-cooled composite film of claim 1, wherein: the planar metal reflecting layer (1) is made of aluminum Al, silver Ag or nickel Ni.
3. The passive, radiation-cooled composite film of claim 1, wherein: thickness H of the planar metal reflective layer (1)1Is 100-200 nm.
4. A passive, radiation-cooled composite film according to claim 1, wherein: thickness H of the infrared light emitting layer2Is 5-15 μm.
5. A passive, radiation-cooled composite film according to claim 1, wherein: the arrangement mode of the optical microstructure units (3) is periodic arrangement or quasi-periodic arrangement.
6. A passive, radiation-cooled composite film according to claim 1, wherein: the optical microstructure unit (3) is in the shape of a two-dimensional micron pyramid, a two-dimensional micron cylinder, a two-dimensional micron hemisphere, a two-dimensional micron cuboid column, a one-dimensional micron triangular prism or a one-dimensional micron cuboid column.
7. The passive, radiation-cooled composite film of claim 1, wherein: the period of the optical microstructure unit (3) is 3-8 μm.
8. The passive, radiation-cooled composite film of claim 1, wherein: the groove depth H of the optical microstructure unit (3)3Is 3-10 μm.
9. The passive, radiation-cooled composite film of claim 1, wherein: the duty ratio of the optical microstructure unit (3) is 0.5-0.9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011287551.2A CN112460836A (en) | 2020-11-17 | 2020-11-17 | Passive radiation cooling composite material film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011287551.2A CN112460836A (en) | 2020-11-17 | 2020-11-17 | Passive radiation cooling composite material film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112460836A true CN112460836A (en) | 2021-03-09 |
Family
ID=74836467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011287551.2A Withdrawn CN112460836A (en) | 2020-11-17 | 2020-11-17 | Passive radiation cooling composite material film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112460836A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984858A (en) * | 2021-03-18 | 2021-06-18 | 哈尔滨工业大学 | Preparation method and application of microstructure radiation refrigeration device |
| CN113063240A (en) * | 2021-03-19 | 2021-07-02 | 大连理工大学 | Composite structure surface in field of radiation-enhanced refrigeration |
| CN113527740A (en) * | 2021-07-15 | 2021-10-22 | 伊诺福科光学技术有限公司 | Radiation refrigeration film with surface periodic micro-nano structure and preparation method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160362807A1 (en) * | 2015-06-15 | 2016-12-15 | Palo Alto Research Center Incorporated | Producing Passive Radiative Cooling Panels And Modules |
| CN107923718A (en) * | 2015-06-18 | 2018-04-17 | 纽约市哥伦比亚大学理事会 | System and method for radiating cooling and heating |
| CN108710169A (en) * | 2018-08-03 | 2018-10-26 | 浙江大学 | Radiation refrigeration optical filter and its preparation method and application |
| CN109084610A (en) * | 2018-07-18 | 2018-12-25 | 华中科技大学 | It is a kind of for the transparent flexible thin-film material of radiation refrigeration on daytime and application |
| CN109631409A (en) * | 2019-01-19 | 2019-04-16 | 天津大学 | The passive type radiation-cooled structure and cooling means of high temperature resistant high IR transmitting |
| CN110567188A (en) * | 2019-09-17 | 2019-12-13 | 天津大学 | Winter and summer temperature adjusting device based on radiation cooling and solar energy utilization and construction method |
| CN110972467A (en) * | 2019-05-31 | 2020-04-07 | 宁波瑞凌新能源科技有限公司 | Composite radiation refrigeration film, composite radiation refrigeration film material and application thereof |
| CN111718584A (en) * | 2020-06-18 | 2020-09-29 | 上海交通大学 | Radiation cooling film, preparation method and application thereof |
-
2020
- 2020-11-17 CN CN202011287551.2A patent/CN112460836A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160362807A1 (en) * | 2015-06-15 | 2016-12-15 | Palo Alto Research Center Incorporated | Producing Passive Radiative Cooling Panels And Modules |
| CN107923718A (en) * | 2015-06-18 | 2018-04-17 | 纽约市哥伦比亚大学理事会 | System and method for radiating cooling and heating |
| CN109084610A (en) * | 2018-07-18 | 2018-12-25 | 华中科技大学 | It is a kind of for the transparent flexible thin-film material of radiation refrigeration on daytime and application |
| CN108710169A (en) * | 2018-08-03 | 2018-10-26 | 浙江大学 | Radiation refrigeration optical filter and its preparation method and application |
| CN109631409A (en) * | 2019-01-19 | 2019-04-16 | 天津大学 | The passive type radiation-cooled structure and cooling means of high temperature resistant high IR transmitting |
| CN110972467A (en) * | 2019-05-31 | 2020-04-07 | 宁波瑞凌新能源科技有限公司 | Composite radiation refrigeration film, composite radiation refrigeration film material and application thereof |
| CN110567188A (en) * | 2019-09-17 | 2019-12-13 | 天津大学 | Winter and summer temperature adjusting device based on radiation cooling and solar energy utilization and construction method |
| CN111718584A (en) * | 2020-06-18 | 2020-09-29 | 上海交通大学 | Radiation cooling film, preparation method and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984858A (en) * | 2021-03-18 | 2021-06-18 | 哈尔滨工业大学 | Preparation method and application of microstructure radiation refrigeration device |
| CN112984858B (en) * | 2021-03-18 | 2022-07-26 | 哈尔滨工业大学 | Preparation method and application of microstructure radiation refrigeration device |
| CN113063240A (en) * | 2021-03-19 | 2021-07-02 | 大连理工大学 | Composite structure surface in field of radiation-enhanced refrigeration |
| CN113063240B (en) * | 2021-03-19 | 2022-04-12 | 大连理工大学 | Composite structure surface in field of radiation-enhanced refrigeration |
| CN113527740A (en) * | 2021-07-15 | 2021-10-22 | 伊诺福科光学技术有限公司 | Radiation refrigeration film with surface periodic micro-nano structure and preparation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112460836A (en) | Passive radiation cooling composite material film | |
| Kim et al. | Switchable diurnal radiative cooling by doped VO 2 | |
| Kou et al. | Daytime radiative cooling using near-black infrared emitters | |
| US9923111B2 (en) | Illumination and radiative cooling | |
| US20170297750A1 (en) | Radiative Cooling Panels For Spacecraft | |
| CN110274326B (en) | Daytime radiation refrigerator and preparation method thereof | |
| CN109341137A (en) | Passive refrigeration structure based on photonic crystal | |
| Dai et al. | Radiative cooling with multilayered periodic grating under sunlight | |
| Du et al. | VO2-based intelligent thermal control coating for spacecraft by regulating infrared emittance | |
| CN110462464B (en) | Radiation cooling device and radiation cooling method | |
| CN110109204B (en) | Color radiation cooler based on Tamu structure | |
| Zhang et al. | Photonics empowered passive radiative cooling | |
| Zhang et al. | Cost effective 24-h radiative cooler with multiphase interface enhanced solar scattering and thermal emission | |
| CN106206830B (en) | A kind of infrared detector based on graphene interlayers formula infrared absorption layer | |
| Chowdhary et al. | Selective thermal emitters for high-performance all-day radiative cooling | |
| KR102225804B1 (en) | Radiative cooling device utilizing optical properties of substrate | |
| JP2021044239A (en) | Radiant device | |
| JP7004597B2 (en) | Radiative cooling device | |
| CN114114485A (en) | Novel radiation refrigeration device based on super-structure surface broadband absorber | |
| Ling et al. | Doped semiconductor nanoparticles for possible daytime radiative cooling applications | |
| Zhi-chang et al. | A multilayer film based on thin-film interference and impedance matching for dual-laser and infrared stealth as well as thermal management | |
| CN115220221A (en) | Setting and manufacturing method of asymmetric photonic mirror enhanced radiation heat management device | |
| CN112503654A (en) | Single-channel night passive radiation cooling film | |
| Pradhan et al. | Thin nanoporous anodic alumina film on aluminium for passive radiative cooling | |
| Zhou et al. | Enhancing radiative cooling performance for bifacial photovoltaic module using two kinds of polycarbonate films |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210309 |