Spectral adaptive coating material capable of achieving solar heat collection in daytime and radiation refrigeration in nighttime

A technology of solar heat collection and coating materials, applied in the direction of solar thermal power generation, coating, etc., can solve the problems of low thermal efficiency, large radiation heat loss, etc., and achieve the effect of reducing radiation heat loss and reducing the complexity of the structure

Active Publication Date: 2019-07-19
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Such coating materials have the same spectral characteristics regardless of daytime and nighttime, so that in the daytime solar heat collection mode, due to the high absorption (emission) rate of the coating material in the "atmospheric window" band (8-13 μm), there is a relatively high Large radiation heat loss, lower thermal efficiency compared to traditional solar selective absorbing coating materials

Method used

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  • Spectral adaptive coating material capable of achieving solar heat collection in daytime and radiation refrigeration in nighttime
  • Spectral adaptive coating material capable of achieving solar heat collection in daytime and radiation refrigeration in nighttime
  • Spectral adaptive coating material capable of achieving solar heat collection in daytime and radiation refrigeration in nighttime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 2 , a spectrally adaptive coating material for solar heat collection during the day and radiative cooling at night includes a base layer 1 , an infrared emitting layer 2 , a phase change layer 3 and an anti-reflection layer 4 arranged in sequence from bottom to top.

[0041] The base layer 1 is aluminum with a thickness of 150 nm; the infrared emission layer 2 is quartz with a thickness of 500 μm; the phase change layer 3 is vanadium dioxide with a thickness of 200 nm; the anti-reflection layer 4 is aluminum oxide with a thickness of 86 nm. Its spectral emission (absorption) rate in the 0.3-25 μm band in the heat collection mode during the day and the radiative cooling mode at night is as follows: image 3 shown.

[0042] During the day, when the temperature of the coating material is higher than the transition temperature, the absorptivity of the coating material in the solar radiation band (0.3-3 μm) is 0.85, and the emissivity in the infrared band (3-25 ...

Embodiment 2

[0044] see figure 2 , a spectrally adaptive coating material for solar heat collection during the day and radiative cooling at night includes a base layer 1 , an infrared emitting layer 2 , a phase change layer 3 and an anti-reflection layer 4 arranged in sequence from bottom to top.

[0045] The base layer 1 is 200 nm thick tungsten; the infrared emission layer 2 is 500 μm thick aluminum oxide single crystal (also known as sapphire); the phase change layer 3 is 230 nm thick vanadium dioxide; the antireflection layer 4 is made of 176 nm thick Silicon dioxide (low refractive index material), 44 nm thick vanadium dioxide (high refractive index material) and 92 nm thick silicon dioxide (low refractive index material) are sequentially overlapped. Its spectral emission (absorption) rate in the 0.3-25 μm band in the heat collection mode during the day and the radiative cooling mode at night is as follows: Figure 4 shown.

[0046] During the day, when the temperature of the coati...

Embodiment 3

[0048] see figure 2 , a spectrally adaptive coating material for solar heat collection during the day and radiative cooling at night includes a base layer 1 , an infrared emitting layer 2 , a phase change layer 3 and an anti-reflection layer 4 arranged in sequence from bottom to top.

[0049] The base layer 1 is black chrome selective absorption coating; the infrared emission layer 2 is glass with a thickness of 1 mm; the phase change layer 3 is vanadium dioxide with a thickness of 160 nm; the anti-reflection layer 4 is aluminum oxide with a thickness of 50 nm. Its spectral emission (absorption) rate in the 0.3-25 μm band in the heat collection mode during the day and the radiative cooling mode at night is as follows: Figure 5 shown.

[0050] During the day, when the temperature of the coating material is higher than the transition temperature, the absorptivity of the coating material in the solar radiation band (0.3-3 μm) is 0.85, and the emissivity in the infrared band (3...

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Abstract

The invention relates to a spectral adaptive coating material capable of achieving solar heat collection in the daytime and radiation refrigeration in the nighttime. The spectral adaptive coating material comprises a substrate layer, an infrared emission layer, a phase-change layer and an antireflection layer which are sequentially arranged from bottom to top; the substrate layer is made of a material with solar radiation wave bands of 0.3-3 [mu]m and the high absorptivity or a metal material; the infrared emission layer is made of a material with 'atmospheric window' wave bands of 8-13 [mu]mand the high emissivity; the phase-change layer is made of a material with the thermal phase-change characteristic; and the antireflection layer is made of a single-layer material with the low refractive index or is of an alternately-overlapped structure constituted by a low-refractive-index material and a high-refractive-index material. According to the difference of solar radiation in the daytime and in the nighttime, the temperature of the coating material is spontaneously changed, thus the spectral characteristic of the coating material is changed, and the two functions of efficient solarheat collection in the daytime and radiation refrigeration in the nighttime are achieved; and the spectral adaptive coating material is simple in structure and easy to prepare, the application fieldsof a solar heat collection technology and a radiation refrigeration technology are widened, and great promotional value is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy utilization, and in particular relates to the comprehensive application of solar heat collection and radiation refrigeration with variable spectral selectivity. Background technique [0002] The sun is the largest heat source and light source for the earth. There are several forms of solar energy utilization, photoelectric utilization, photothermal utilization and photochemical utilization. Solar heat collection technology (photothermal utilization) is one of the most mature technologies for solar energy utilization. One of the research focuses of solar heat collection technology is to obtain high-quality solar selective absorption coating materials. Solar selective absorption coating materials have high absorption (emission) rates in the solar radiation band (0.3-3 μm). The infrared band has a low absorption (emission) rate. [0003] The temperature of space outside the earth's atmosphere is cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S70/225F24S70/25F24S70/30
CPCF24S70/225F24S70/25F24S70/30Y02E10/40
Inventor 裴刚敖显泽胡名科赵斌陈诺
Owner UNIV OF SCI & TECH OF CHINA
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