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A kind of ultra-thin solar heater and preparation method thereof

A solar and heater technology, applied in the field of solar energy technology and application, can solve the problems of unfavorable solar energy collection, narrow short-band absorption bandwidth, low heat collection and conversion efficiency, and achieve flexible structure design, easy preparation, and low cost low effect

Active Publication Date: 2018-11-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its absorption bandwidth in the short-wave band is too narrow, which is not conducive to the collection of solar energy. Even if there is no energy radiation in the long-wave band, the heat collection and conversion efficiency is not high.

Method used

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  • A kind of ultra-thin solar heater and preparation method thereof
  • A kind of ultra-thin solar heater and preparation method thereof
  • A kind of ultra-thin solar heater and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The metal substrate 1 is set to be tantalum, and its thickness is thick enough so that no light can pass through; the metal bowl-shaped nanostructure 2 is tantalum, and the thickness is determined by the process; the lossy dielectric film 3 is germanium, and the thickness is 10 nm; the lossless dielectric film 4 is Silicon dioxide, thickness 80nm. The structure can be prepared by the following steps: self-assemble on a metal tantalum substrate to generate a single layer of densely arranged polystyrene nanosphere arrays with a diameter of 800 nm; sputter a 100 nm thick metal tantalum film on the nanosphere array and In the gap between the nano-spheres; the polystyrene nano-spheres and the metal tantalum film covering them were ultrasonically removed in tetrahydrofuran, and a metal tantalum bowl-shaped nanostructure was formed on the surface of the metal tantalum substrate; sequentially sputtering 10 nm thick loss Dielectric film and 80 nm thick lossless dielectric film t...

Embodiment 2

[0037] The metal substrate 1 is set to be tungsten, which is thick enough that no light can pass through; the metal bowl-shaped nanostructure 2 is made of tungsten, and the thickness is determined by the process; the lossy dielectric film 3 is made of silicon, and the thickness is less than 1 / 4 of the wavelength of light propagating in it. ; The lossless dielectric film 4 is silicon dioxide, with a thickness of about 1 / 4 nm of the wavelength of light propagating therein. The structure can be prepared by the following steps: self-assemble on a metal tungsten substrate to generate a single layer of densely arranged PS nanosphere arrays with a diameter of 300-1000 nm; sputter metal tungsten film on the nanosphere array and nanospheres In the gap between them; ultrasonically remove PS nanospheres and the metal tungsten film covering them in tetrahydrofuran, and form metal tungsten bowl-shaped nanostructures on the surface of the metal tungsten substrate; sequentially sputter lossy ...

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Abstract

The invention discloses an ultra-thin sunlight heater and a preparation method therefor. The ultra-thin sunlight heater comprises a metal base, a metal bowl-shaped nanostructure, a loss dielectric thin film and a loss-less dielectric thin film, wherein the metal bowl-shaped nanostructure is prepared on the surface of the metal base, and the metal bowl-shaped nanostructure is uniformly covered with the ultra-thin loss dielectric thin film; and the loss-less dielectric thin film uniformly covers the ultra-thin loss dielectric thin film. According to the ultra-thin sunlight heater, a strong light interference effect is introduced to the ultra-thin loss dielectric based on a phase difference between metal and loss dielectric; meanwhile, the absorption of the ultra-thin loss dielectric is reinforced based on the metal bowl-shaped nanostructure, and the absorption bandwidth is expanded through the loss-less dielectric thin film on the top layer while long waveband absorption / radiation is not increased, and a high balance temperature is obtained; the absorption bandwidth and cut-off wavelength can be regulated and controlled flexibly, and spectrum is selectively regulated and controlled; single-layer densely-arranged nanometer sphere arrays are generated by a self-assembling method; and therefore, large-area sample preparation can be realized easily, and the cost is low.

Description

technical field [0001] The invention belongs to the field of solar technology and application, and in particular relates to an ultra-thin solar heater applicable to a solar thermal system and a preparation method. Background technique [0002] Solar heaters are used to collect and convert sunlight into heat energy, and are the core components of solar water heaters, solar thermal power generation systems, and solar thermal photovoltaic systems. The higher the conversion efficiency of the solar heater, the more heat generated by the same sunlight irradiation, and the higher the efficiency of the system for generating hot water and generating electricity. Currently, black paint is a widely used solar light absorbing material in commercial solar thermal systems, and its absorption spectrum covers the 0.4-25 μm band. According to Kirchhoff's law, under thermal equilibrium conditions, the absorption efficiency of an object is equal to its radiation efficiency. Therefore, the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/052H01L31/18
CPCH01L31/0547H01L31/18Y02E10/52Y02P70/50
Inventor 杨柳迟克群何赛灵
Owner ZHEJIANG UNIV