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A spectrally adaptive coating material for daytime solar heat collection and nighttime radiative cooling

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 large radiation heat loss and low thermal efficiency, and achieve the effect of reducing radiation heat loss and reducing the complexity of the structure

Active Publication Date: 2020-06-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A spectrally adaptive coating material for daytime solar heat collection and nighttime radiative cooling
  • A spectrally adaptive coating material for daytime solar heat collection and nighttime radiative cooling
  • A spectrally adaptive coating material for daytime solar heat collection and nighttime radiative cooling

Examples

Experimental program
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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 present application discloses a spectrum-adaptive coating material for solar heat collection during day and radiation cooling at night. The spectrum-adaptive coating material comprises, from bottom to top, a base layer, an infrared emission layer, a phase change layer, and an antireflection layer. The base layer is made from a material having high absorptivity at a solar radiation wave band of 0.3 to 3 μm, or is made from a metal material having high reflectivity at the solar radiation wave band of 0.3 to 3 μm. The infrared emission layer is made from a material having high emissivity at the "atmospheric window" wave band of 8 to 13 μm. The phase change layer is made from a material having thermally induced phase change characteristics. The antireflection layer is made from a single-layer material having low refractive index, or is made from a material formed by stacking a material having low refractive index and a material having high refractive index. According to the invention, the difference in solar radiation between day and night causes the the temperature of the coating material to change spontaneously, changing spectral characteristics of the coating material, and thereby performing efficient solar heat collection during day and radiation cooling at night. The invention thus has high potential for widespread use.

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 Patents(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