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Radiation refrigeration and sweating cooling combined composite film

A technology of sweating cooling and radiation cooling, which is applied in refrigeration and liquefaction, refrigerators, lighting and heating equipment, etc. It can solve the problems of not having high reflectivity, etc., and achieve the effect of simple structure, good flexibility, and enhanced cooling effect

Pending Publication Date: 2020-08-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A typical radiator used in radiative cooling is a near-black body radiator, which has high emissivity in almost all wavelength ranges. This radiator has a relatively high cooling capacity, but in the solar radiation wavelength range Do not have high reflectivity inside, thus limiting the application of most near black body radiators in daytime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Provides a composite film combining radiative cooling and sweat cooling with an area of ​​100×60mm 2 , is a three-layer structure, from top to bottom are the protective layer, radiation cooling layer and sweating cooling layer, in which:

[0028] The protective layer is a porous polyethylene-silicon dioxide film with a thickness of 100 μm. By placing silicon dioxide in a hot polyethylene melt, a white porous polyethylene-silicon dioxide film is obtained after cooling; because porous polyethylene -Silicon dioxide film is white, has strong scattering ability to visible light, and has good hydrophobicity, which can be used as a protective material;

[0029] The radiation cooling layer is PDMS with a thickness of 140μm and an infrared emissivity of 0.91, which can exert the effect of radiation cooling;

[0030] The sweating cooling layer is AAM hydrogel containing lithium bromide salt solution inside, with a thickness of 200 μm, which can absorb and lose water according to...

Embodiment 2

[0034] Provides a composite film combining radiative cooling and sweat cooling with an area of ​​80×60mm 2 , is a two-layer structure, the upper layer is a protective layer, which also has a radiation cooling effect, and the lower layer is a sweating cooling layer; where:

[0035] The protective layer is PDMS with a thickness of 140 μm, good hydrophobicity, high visible light transmittance (greater than 90%), and infrared emissivity of 0.91. The protective layer also has a radiation cooling effect;

[0036] The sweating cooling layer is AAM hydrogel containing lithium bromide solution inside, with a thickness of 500 μm and high visible light transmittance (greater than 90%). It can absorb and lose water according to changes in ambient temperature and humidity, thereby cooling down. ;

[0037] The composite film has a micron through hole array, and the micron through hole array is obtained by laser drilling.

[0038] The composite film combined with radiative cooling and swea...

Embodiment 3

[0040] Provide a composite film combining radiative cooling and sweat cooling, which has a two-layer structure, the upper layer is a protective layer, the lower layer is a sweat cooling layer, and has a radiation cooling effect; wherein:

[0041] The protective layer is a porous hydrophobic PET film with a thickness of 16 μm, which is a porous film with high visible light transmittance (greater than 90%) and good hydrophobicity;

[0042] The sweating cooling layer is a porous AMM hydrogel containing lithium bromide solution inside, with a thickness of 200 μm, high visible light transmittance (greater than 90%), infrared emissivity of 0.95, and radiation cooling effect.

[0043] The composite film combined with radiative cooling and sweat cooling obtained in this example, after testing, the temperature drop can always be maintained at 15°C when the ambient temperature is 25-40°C during the day, and the temperature drop can always be maintained at 15-25°C at night. Keep at 3-10°...

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Abstract

The invention discloses a radiation refrigeration and sweating cooling combined composite film which is of a two-layer or three-layer structure and comprises a protective layer and a sweating coolinglayer, the protective layer is the uppermost layer, and the sweating cooling layer is the lowermost layer. The protective layer is made of a porous flexible material with hydrophobicity, the sweatingcooling layer is made of a hydrophilic porous flexible material containing a salt solution inside, the radiation refrigeration and sweating cooling combined composite film also comprises a radiation refrigeration layer, the radiation refrigeration layer is made of a porous flexible material and has high infrared emissivity, the infrared emissivity is 0.5-1.0, and the radiation refrigeration layeris the protective layer or the sweating cooling layer or is located between the protective layer and the sweating cooling layer. The composite film is cooled mainly through sweating in the daytime andcooled through radiation refrigeration at night, meanwhile, the daytime evaporation water amount of the sweating cooling layer is supplemented, cyclic utilization is achieved, the cooling effect is greatly enhanced by combining the two refrigeration modes of radiation refrigeration and sweating cooling, and universality is achieved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a composite film combined with radiation refrigeration and sweat cooling. Background technique [0002] Refrigeration technology refers to the use of artificial methods to reduce the temperature of an object below the ambient temperature within a certain time and space. It has important applications in food preservation, cold chain transportation, internal environment regulation of buildings, and clothing design. [0003] Radiation refrigeration technology, as a kind of refrigeration technology, its basic principle is the principle of thermal radiation. In the wavelength range of the transparent window of the atmosphere of 8-13μm, the atmosphere is highly transparent to thermal radiation. This atmospheric window coincides with the peak wavelength of thermal radiation from terrestrial objects at typical ambient temperatures, and terrestrial objects with high emi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/20B32B3/24B32B27/06B32B27/36B32B9/00B32B9/04B32B7/023B32B33/00F25B23/00
CPCB32B3/266B32B9/00B32B9/045B32B27/06B32B27/20B32B27/32B32B27/36B32B33/00B32B7/023F25B23/003
Inventor 刘抗毛铭冉傅佳王晨逸刘辉东冯春早廖雨田
Owner WUHAN UNIV
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