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Selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration

A technology of solar heat collection and radiant cooling, applied in solar thermal power generation, combination of heating and cooling, solar thermal devices, etc. Differences, good prospects and promotion implications, effects on meeting heating and cooling needs

Active Publication Date: 2015-05-13
裴刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the spectral selectivity of solar heat collection is very different from that of radiation cooling, if the solar heat collection absorption coating is used to collect heat, the radiation cooling function at night will be affected. Similarly, if the radiation cooling emission coating is used for cooling, the solar heat collection during the day affected
Since the contradiction between solar thermal collection and radiative cooling in terms of spectrum selection has not been resolved, so far no breakthroughs have been made in the research on the combined use of solar thermal collection during the day and radiative cooling at night.

Method used

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  • Selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration
  • Selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration
  • Selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration

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Embodiment 1

[0020] see figure 1 , the selective absorption emission composite material satisfying solar heat collection and radiation cooling includes a substrate 3, and the material of the substrate 3 is an aluminum plate. A selective absorption layer 2 is plated on the substrate 3, the selective absorption layer 2 is a vacuum magnetron sputtering cermet (CERMET) coating tape, and the selective absorption layer 2 has an absorptivity of 0.97 in the solar radiation spectral region below a wavelength of 3 μm , the emissivity is as low as 0.05 in the middle and far infrared spectral regions. A selective emission layer 1 is coated on the selective absorption layer 2, and the material of the selective emission layer 1 is a polytetrafluoroethylene film, which has an emissivity above 0.60 in the spectral region of space radiation refrigeration with a wavelength of 8-13 μm, and in other The spectral region has a transmittance of 0.60 or more.

Embodiment 2

[0022] When analyzing the performance of absorbing solar radiation and radiation cooling of selective absorption emission composite materials that meet solar heat collection and radiation cooling, in order to analyze the radiation characteristics of the surface of the composite material, a layer of light transmittance is added to the surface of the composite material A good cover plate 4 (such as ultra-white textured tempered glass cover plate or polyethylene film) can prevent the convective heat loss between the surface of the composite material and the surrounding environment, and its structure is as follows figure 2 shown.

[0023] The substrate 3 is a thin aluminum plate with good thermal conductivity, with a thickness of 1 mm; the selective absorption layer 2 is a black chrome coating, the absorption rate in the band below 3 μm is 0.90, and the emissivity in the mid-far infrared band is 0.15; the selective emission layer 1 The material is polyvinyl fluoride film, which h...

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Abstract

The invention relates to a selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration. The selective absorption emission composite material comprises a substrate, wherein a selective absorption layer and a selective emission layer are sequentially arranged on the substrate; the selective absorption layer has high absorption rate in a solar radiation spectral region with a wavelength of below 3 microns; the selective emission layer has high emission rate in a space radiation refrigeration spectral region with a wavelength of 8-13 microns. The selective absorption emission composite material has the high absorption rate in a spectral region with strong solar radiation in daytime, the low emission rate in medium-far infrared spectral regions, the high emission rate in a spectral region with space radiation refrigeration at night, and the low emission rate in other medium-far infrared spectral regions, thereby obtaining heat by absorbing solar radiation in daytime, obtaining cool energy through space radiation at night, reducing the radiation heat (cold) loss with ground and atmosphere during heat collection in daytime and refrigeration at night, and being capable of efficiently realizing two functions of solar heat collection and radiation refrigeration.

Description

technical field [0001] The patent of the invention relates to the application of solar heat collection and space radiation cooling, and belongs to the field of energy utilization technology. Background technique [0002] Devices that use solar radiation to collect heat during the day have been widely used, such as solar water heaters, solar air collectors and solar double-effect collectors. But these solar heat collecting devices can only be utilized under the situation that solar radiation is arranged during the day, and these heat collecting devices are all in idle state at night. If these heat collecting devices are used to obtain cold energy in space radiation cooling at night, the dual effects of solar heat collection during the day and radiation cooling at night can be realized. However, since the spectral selectivity of solar heat collection is very different from that of radiation cooling, if the solar heat collection absorption coating is used to collect heat, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B15/20B32B27/06F24J2/46F25B29/00
CPCY02E10/40F24S70/225F24S70/30
Inventor 裴刚张龙灿郑仁春
Owner 裴刚
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