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Transparent heat mirror of solar photothermal conversion heat collector and manufacturing method of transparent heat mirror

A light-to-heat conversion and solar energy technology, applied in the direction of solar thermal power generation, solar thermal devices, chemical instruments and methods, etc., can solve the problem of loss of sunlight transmittance and other issues

Active Publication Date: 2014-06-25
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the transparent conductive oxide film of the transparent hot mirror still absorbs the solar spectrum and is related to its film thickness (inversely proportional to the emissivity), the transparent hot mirror made of a single-layer transparent conductive oxide film will lose part of the sunlight Transmittance

Method used

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  • Transparent heat mirror of solar photothermal conversion heat collector and manufacturing method of transparent heat mirror
  • Transparent heat mirror of solar photothermal conversion heat collector and manufacturing method of transparent heat mirror
  • Transparent heat mirror of solar photothermal conversion heat collector and manufacturing method of transparent heat mirror

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1 Solar light-to-heat conversion heat collector transparent thermal mirror and its preparation

[0077] The membrane structure of this example is:

[0078] (where K is a multiple of 1 / 4 central wavelength λ=480nm, and d is the physical thickness of each layer of film) The preparation steps of the transparent hot mirror are described in detail below:

[0079] 1) Glass is 1mm borate low-iron glass (plane size: 300×300mm). The glass substrate processing method is the same as the aforementioned 1.1.

[0080] 2) D1 is the material A1 introduced in Section 2.1 2 o 3 , 81nm, the coating process is the same as 1.3; the substrate movement speed: 0.4m / min; the substrate moves back and forth 24 times.

[0081] 3) The ITO layer is 121nm, in A1 2 o 3 Deposit ITO on the layer, the coating process is the same as 1.2, the substrate movement speed: 0.4m / min; the substrate moves back and forth twice.

[0082] 4) D2 material is SiO 2 , 90nm, deposited SiO on the ITO la...

Embodiment 2

[0090] Example 2 Transparent thermal mirror of solar light-to-heat conversion collector and its preparation

[0091] In this example, the film structure transparent hot mirror is:

[0092]

[0093] (K is a multiple of 1 / 4 central wavelength λ=480nm, d is the physical thickness of each film) here:

[0094] D1 is the high refractive index material TiO introduced in Section 2.2 2 and low refractive index material SiO 2 Alternate, the number of times of alternation n=1; the materials of the remaining layers are the same as in Example 1), K and d are designed according to the above-mentioned values ​​in this example.

[0095] In this example, steps 1), 3)-5) in the preparation are the same as in Example 1, except that step 2) has changed: TiO in step 2) 2 Deposited on a glass substrate, the coating process is the same as 1.4, the substrate movement rate: 0.4m / min; the substrate moves back and forth 3 times; SiO 2 TiO deposited on D1 2 On the layer, the coating process is th...

Embodiment 3

[0097] Example 3 Solar-light-to-heat conversion heat collector transparent thermal mirror and its preparation

[0098] In this example, the film structure transparent hot mirror is:

[0099]

[0100] (K is a multiple of 1 / 4 central wavelength λ=550nm, d is the physical thickness of each film) here:

[0101] D1 is the (high refractive index / low refractive index) n introduced in Section 2.2, n=2, where the high refractive index material is ITO, and the low refractive index material is SiO 2 All the other layer materials are identical with embodiment 1), K and d are by the above-mentioned design value of this example.

[0102] In this example, the method of processing the glass substrate in step 1) of the preparation is the same as that in Example 1.

[0103] In this example, step 2 in the preparation) prepares D1 (ITO / SiO 2 ) 2 In the magnetron sputtering coating process parameters, n is the stage of 1, when the ITO film with a thickness of about 21nm is prepared on the...

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Abstract

The invention discloses a transparent heat mirror of a solar photothermal conversion heat collector and a manufacturing method of the transparent heat mirror. The transparent heat mirror comprises a GLASS / D1 / ITO / D2 or Porous-SiO2 / GLASS / D1 / ITO / D2 / Porous-SiO2 or GLASS / ITO / D2 / D1 film system structure. An ITO film is not only an infrared heat reflection function layer, and is matched with a high-low-refractivity antireflection film system from the perspective of optical design, so that spectral selectivity of the transparent heat mirror is higher than that of a single-layer transparent heat mirror, and solar spectrum (300-2500nm) transmissivity of the transparent heat mirror is improved by 10% when compared with that of a single-layer TCO-film transparent heat mirror with identical radiance and manufactured under the conditions of a same transparent substrate and same processes.

Description

Technical field: [0001] The invention belongs to the field of nano-film materials in solar light and heat utilization, and relates to a structure of a transparent thermal mirror used as a solar heat collector, a coating material and a preparation method thereof. technical background: [0002] Solar energy is one of the most important renewable energy sources. The ways to utilize solar energy mainly include two forms: photothermal and photovoltaic. The solar collector is a key component in the utilization of light and heat, and its basic working principle can be found in Figure 4 . Sunlight is irradiated on the heat absorber placed in the solar collector and coated with light absorbing material on the surface, most of which are absorbed and converted into heat energy which is output and utilized by the heat transfer medium; at the same time, the heat absorber at the working temperature The body also dissipates heat to the surroundings through conduction, convection, and ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/50B32B17/06B32B9/04
CPCF24S80/52Y02E10/40
Inventor 刘静汪洪
Owner CHINA BUILDING MATERIALS ACAD
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