CN1084466C - Solar selective absorbing coating capable of controling emissivity - Google Patents
Solar selective absorbing coating capable of controling emissivity Download PDFInfo
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- CN1084466C CN1084466C CN 96120413 CN96120413A CN1084466C CN 1084466 C CN1084466 C CN 1084466C CN 96120413 CN96120413 CN 96120413 CN 96120413 A CN96120413 A CN 96120413A CN 1084466 C CN1084466 C CN 1084466C
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- solar
- solar selective
- absorbing coating
- selective absorbing
- emissivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Physical Vapour Deposition (AREA)
Abstract
The present invention relates to a solar selective absorption coating layer capable of controlling heat emissivity and a manufacturing method of the solar selective absorption coating layer, which belongs to the technical field of solar energy utilization. The present invention is adapted to light-heat conversion and is particularly suitable for a solar water heater. The present invention has the technical scheme that the solar selective absorption coating layer adopts a metal bottom layer which is subtransparent or fully transparent to visible light and infrared light and changes the thickness of the metal bottom layer and the thickness of a composite material film of the bottom layer of an adjacent metal bottom layer to control the emissivity, and the purpose of inhibition of the empty solarization temperature of a heat collection pipe is achieved. The present invention has the advantages of good effect and simple method.
Description
The present invention relates to a kind of solar selective absorbing coating of controlled thermal emissivity, belong to the solar energy utilization technique field.Be applicable to light-heat conversion, be specially adapted to solar heat collector.
The solar selective absorbing coating that metal-medium composite material film and high reflective bottom layer are formed develops rapidly, is widely used.Disclosed patent US3952724, US3960136, US4016860, US4018215, US4033327 and GB1566522 etc. prepare with vacuum evaporation technique; And GB1558440, GB1570044, DT2725914, CA1075108, CA1083452, US4339484 and ZL85100142 etc. prepare with magnetron sputtering technique.Above-mentioned solar selective absorbing coating all has higher solar absorptance and lower thermal emissivity, wherein the disclosed solar selective absorbing coating of US4339484 comprises containing metal-carbide absorbed layer and infrared high reflective copper bottom, solar absorptance α ≈ 0.82, emissivity ≈ 0.03 (room temperature).The disclosed solar selective absorbing coating of ZL85100142 comprises that the high anti-aluminium film that thickness is not less than 100nm is a bottom, the aluminium nitrogen compound absorbing material of thickness 80nm-250nm, the composition of absorbing material is gradual change with thickness, solar absorptance α ≈ 0.93, emissivity 0.06 (100 ℃) (" sputtered coating absorbing solar energy selectively and manufacture method " specification walks to the 4th page of the 16th row for the 1st page the 3rd).Coating structure as shown in Figure 1, the 1st, the high reflecting metal bottom, the 2nd, metal-medium composite absorbed layer, A is a carrier.The complete glass vacuum sun thermal-collecting tube made from this coating is the solar water heater that heat collecting element is formed, because it is long, not influenced by ambient temperature to have a collecting efficiency height, life-span, plurality of advantages such as all moves throughout the year, receives praises from customers.But, because above-mentioned solar selective absorbing coating absorptivity height, and all has an opaque high reflecting metal bottom, emissivity almost is a definite value, therefore, it is just very high that sky with thermal-collecting tube of this class solar selective absorbing coating shines temperature, for example has the complete glass vacuum sun thermal-collecting tube of the disclosed solar selective absorbing coating of ZL85100142, when solar irradiance is 750W/m
2The time, the sky of complete glass vacuum sun thermal-collecting tube shines temperature can be up to more than 230 ℃.If when adopting the disclosed solar energy selective coating of US4339484, solar irradiation is 800W/m
2, the sky of thermal-collecting tube shines temperature can reach 250 ℃.Vacuum solar collector tubes is used to obtain the solar water heater of domestic water so efficiently, if have a power failure, cut off the water or careless manipulation will make troubles: 1. the high-altitude is shone temperature to quicken potted component (as cushion rubber) aging, causes water heater or hot-water heating system to leak; 2. enter cold water suddenly, increase the glass internal stress at thermal-collecting tube loop seal place easily and cause breaking; 3. in the U-shaped tubular type collector, high sky shines the outer surface oxidation that temperature also can make the metal tube of union pipe, even decortication, so that reduces collecting efficiency.Therefore, high efficiency when how to keep the thermal-collecting tube low-temperature working and suitably reduce its empty temperature of shining and caused this area scientific and technical personnel's very big concern, for example the S.J of University of Sydney, Australia west difficult to understand and R.E Collins have carried out exploratory development to this problem, they fill in vacuum heat collection pipe with special organic gas, when low-temperature working, special gas is attracted to the solar selective absorbing coating surface, when temperature raises in the pipe, gas discharges gradually, make gas pressure intensity rising in the thermal-collecting tube, increase conductive heat loss, to reach purpose (" heat conducting experimental study in thin polyatomic gas " S.J of University of Sydney, Australia west difficult to understand and R.E Collins nineteen ninety (the S.J Oshea and R.E Collins that suppresses high-altitude solarization temperature, An Experimental Study of Conduction Heat Transfer in Ravefied Polya tomic Gases University of Sydney, Australia, 1990)).This method preparation technology is very complicated.
The objective of the invention is to propose a kind of solar selective absorbing coating of controlled thermal emissivity, suppress high sky when keeping high-absorbility when being implemented in low-temperature working and shine temperature.
Technical essential of the present invention be on glass, pottery, macromolecular material or carriers such as metal, alloy cube matherial with for visible and near-infrared is semi-transparent and even the metal film of full impregnated is a bottom, promptly metal back layer thickness is 0-100nm.
Adopt vacuum evaporation or magnetron sputtering to reduce the thickness of metal back layer, or the thickness of the composite material film of increasing adjacent metal bottom, strengthen the method for the composite material film thickness of adjacent metal bottom when perhaps reducing metal back layer thickness, reduce the empty temperature of shining when can both obtain high solar absorptance.
Can suppress high sky when advantage of the present invention is the absorptivity that can keep high and shine temperature, thereby it is aging that heat collector potted component when low-temperature working is difficult for, thermal-collecting tube is difficult for bursting, and metal is difficult for oxidation damage in the union pipe.And has the easy advantage of preparation method.
Description of drawings:
Accompanying drawing is the solar selective absorbing coating structural representation.
Embodiment;
When making complete glass vacuum sun thermal-collecting tube, adopt patent of invention ZL95100142 to prepare solar selective absorbing coating, the thickness of deposition of aluminum bottom is 40nm, aluminium-nitrogen absorbing material layer thickness 180nm, this solar selective absorbing coating, after vacuum bakeout was handled, average solar absorptance was 0.927 (AM
2), normal emittance is 0.10 (80 ℃), when solar irradiance is 750W/m
2, the empty solarization of vacuum heat collection pipe temperature is 185 ℃.
When making complete glass vacuum sun thermal-collecting tube, under argon pressure, non-reaction magnetocontrol sputtering copper substrate, thickness 25nm, reactive sputtering stainless steel in argon and acetylene gas mixture-carbon composite absorbs bed thickness 160nm, this solar selective absorbing coating, behind vacuum bakeout, average solar absorptance is 0.921 (AM
2), normal emittance 0.09 (80 ℃) is when solar irradiance is 800W/m
2, it is 190 ℃ that the sky of vacuum heat collection pipe shines temperature.
Claims (5)
1, a kind of solar selective absorbing coating of controlled thermal emissivity, constitute by metal back layer, metal-medium composite absorbed layer, the composition of composite is gradual change, it is characterized in that said metal back layer is semi-transparent and even full impregnated for visible and near-infrared.
2, according to the solar selective absorbing coating of the said controlled thermal emissivity of claim 1, it is characterized in that said metal-medium composite is stainless steel-carbon, said for visible and near-infrared is semi-transparent and even the metal back layer of full impregnated is a copper film, thickness is 0-100nm.
3,, it is characterized in that said copper film thickness is 25nm according to the solar selective absorbing coating of claim 1 or 2 said controlled thermal emissivity.
4, according to the solar selective absorbing coating of the said controlled thermal emissivity of claim 1, when it is characterized in that said metal-medium composite is an aluminium-nitrogen, said for visible and near-infrared is semi-transparent and even the metal back layer of full impregnated is the aluminium film, thickness is 0-100nm.
5,, it is characterized in that said aluminium film thickness is 40nm according to the solar selective absorbing coating of the said controlled thermal emissivity of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120413 CN1084466C (en) | 1996-10-25 | 1996-10-25 | Solar selective absorbing coating capable of controling emissivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120413 CN1084466C (en) | 1996-10-25 | 1996-10-25 | Solar selective absorbing coating capable of controling emissivity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1180822A CN1180822A (en) | 1998-05-06 |
| CN1084466C true CN1084466C (en) | 2002-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96120413 Expired - Fee Related CN1084466C (en) | 1996-10-25 | 1996-10-25 | Solar selective absorbing coating capable of controling emissivity |
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| Country | Link |
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| CN (1) | CN1084466C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186491B (en) * | 2021-05-10 | 2022-11-08 | 清华大学 | Composite layer with continuously adjustable infrared emissivity and application thereof |
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1996
- 1996-10-25 CN CN 96120413 patent/CN1084466C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1180822A (en) | 1998-05-06 |
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| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Qinghua Yangguang Energy Development Co., Ltd., Beijing Applicant before: Solar Energy Electronic Factory, Beijing Qinghua Univ. |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SOLAR ENERGY ELECTRONIC FACTORY OF QINGHUA UNIV., BEIJING TO: BEIJING TSINGHUA SUNSHINE ENERGY DEVELOPMENT CO. |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |