Day and night dual-effect radiation cooler and preparation method thereof

A cooler and high-efficiency technology, applied in the field of heat radiation, can solve the problems of insufficient absorption selectivity, poor selective radiation ability, and inability to realize large-scale production, and achieve the effect of simple preparation method and efficient self-radiation cooling

Active Publication Date: 2019-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the radiation cooler under the condition of no light at night has been realized, but the high-performance radiation cooler that meets the practical performance requirements under the daylight condition has not yet appeared.
The existing publicly reported radiation coolers mainly include the following methods: one is to construct a nanostructured radiation cooler through photo-etching technology and nano-plasma deposition technology. The cost of photon radiation coolers with this structure is high, and it is impossible to achieve large-scale Large-scale production, and the photon radiation cooler has low structural strength, easy damage, and poor long-term stability
The other is to bond inorganic functional substances such as titanium dioxide and glass microspheres with polymers to a highly reflec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment discloses a day and night double-effect radiation cooler and its preparation method, including the following steps:

[0024] (1) According to the stoichiometric ratio of rare earth lanthanum silicate compound SiO 2 -La 2 o 3 -0.5Na 2 O, accurately weigh a certain amount of nano-silica, lanthanum nitrate and sodium nitrate, dissolve them in a mixed solution of ethanol and water, evaporate the solvent in a water bath with stirring at 70°C to obtain a gel, and heat treat at 150°C for 3 hours to obtain rare earth silicic acid Lanthanum calcined powder, heat treatment at 850°C for 6 hours to obtain rare earth lanthanum silicate powder with an average particle size of 125nm.

[0025] (2) According to the stoichiometric ratio of calcium molybdate, accurately weigh the required Ca(NO 3 ) 2 and ammonium molybdate, dissolved in deionized water. Prepare 8% citric acid solution, add a small amount to the above solution drop by drop, stir vigorously while addin...

Embodiment 2

[0030]This embodiment discloses a day and night double-effect radiation cooler and its preparation method, including the following steps:

[0031] (1) According to the stoichiometric SiO of the rare earth samarium silicate compound 2 -1.5Sm 2 o 3 -0.25Na 2 O, accurately weigh a certain amount of nano-silica, samarium nitrate and sodium nitrate, dissolve them in a mixed solution of ethanol and water, evaporate the solvent in a water bath with stirring at 80°C to obtain a gel, and heat treat at 150°C for 4 hours to obtain rare earth silicic acid Samarium calcined powder, heat treatment at 750°C for 9 hours to obtain rare earth samarium silicate powder with an average particle size of 110nm.

[0032] (2) According to the stoichiometric ratio of magnesium molybdate, accurately weigh the required Mg(NO 3 ) 2 and ammonium molybdate, dissolved in deionized water. Prepare 10% citric acid solution, add it dropwise to the above solution, stir vigorously while adding, adjust the pH...

Embodiment 3

[0037] This embodiment discloses a day and night double-effect radiation cooler and its preparation method, including the following steps:

[0038] (1) According to the stoichiometric ratio of rare earth lanthanum silicate SiO 2 -La 2 o 3 -0.8Na 2 O, accurately weigh a certain amount of nano-silica, lanthanum nitrate and sodium nitrate, dissolve them in a volumetric ethanol-water mixed solution, evaporate the solvent in a water bath with stirring at 70°C to obtain a gel, and heat treat at 130°C for 6 hours to obtain rare earth silicon Lanthanum acid calcined powder, heat treatment at 650°C for 12 hours to obtain rare earth lanthanum silicate powder with an average particle size of 104nm.

[0039] (2) According to the stoichiometric ratio of barium molybdate, accurately weigh the required raw material Ba(NO 3 ) 2 and ammonium molybdate, dissolved in deionized water. Configure 10% citric acid solution, add it dropwise to the above solution, stir vigorously while adding, ad...

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Abstract

The invention discloses a day and night dual-effect radiation cooler and a preparation method thereof. The cooler is composed of a broad-spectrum strong-reflection metal substrate and a 8-14 [mu]m infrared strong-selectivity radiation coating smeared on the surface of the substrate, wherein the 8-14 [mu]m infrared strong-selectivity radiation coating consists of a visible-infrared transparent polymer and a 8-14 [mu]m infrared strong-selectivity radiation active nano functional composition, a mass content of the visible-infrared transparent polymer is 10%-80%, and the 8-14 [mu]m infrared strong-selectivity radiation active nano functional composition is composed of nano silica, a rare earth silicate compound and a molybdate compound according to a mass ratio of 1:(0.5-2):(0.5-2). The radiation cooler has excellent solar reflection and 8-14 [mu]m high radiation characteristics, so that the radiation cooler can exert an efficient self-cooling function under conditions of both sunlight irradiation and no sunlight irradiation, can be used for temperature-lowering and cooling with zero energy consumption of facilities and apparatuses such as buildings, grain and oil storage, high-power electronic equipment, and refrigerated bags, and has potential huge energy-saving effects.

Description

technical field [0001] The invention belongs to the technical field of heat radiation, and in particular relates to a day and night double-effect radiation cooler and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the problem of energy crisis has become increasingly prominent. Air-conditioning cooling accounts for a considerable proportion of energy consumption. The development of efficient radiation cooling technology is of great significance for reducing power consumption and protecting the environment. Radiation cooling refers to the process that objects on the earth transfer heat to outer space through infrared atmospheric windows. Radiation cooling materials are materials with spontaneous cooling functions prepared based on this principle. In the process of heat transmission, the atmosphere is the main transmission medium of infrared radiation. Although the atmosphere is transparent to visible light, a large...

Claims

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Application Information

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IPC IPC(8): C09D123/20C09D123/06C09D5/32C09D7/61
CPCC09D123/20C09D123/06C09D5/32C09D7/61C08K2201/011C08K3/34C08K3/24C08K3/36Y02P20/10C09D123/04C09D5/004C08K2201/014C08K2003/2255C08K3/28
Inventor 陆春华房正刚倪亚茹陶爽刘一苇方亮许仲梓
Owner NANJING UNIV OF TECH
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