CN1181489A - Solar diffuse reflector - Google Patents
Solar diffuse reflector Download PDFInfo
- Publication number
- CN1181489A CN1181489A CN96120442A CN96120442A CN1181489A CN 1181489 A CN1181489 A CN 1181489A CN 96120442 A CN96120442 A CN 96120442A CN 96120442 A CN96120442 A CN 96120442A CN 1181489 A CN1181489 A CN 1181489A
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- CN
- China
- Prior art keywords
- solar
- diffuse reflector
- aluminium sheet
- solar diffuse
- reflectivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
- F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
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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
- Y02E10/44—Heat exchange systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
A solar energy diffuse-reflector suitable for solar heat collector using vacuum heat-collecting tubes and solar water heater using inserted vacuum tubes technically features that it is made up of aluminium plate with rolled pattern and optional productive film of alumina. Its advantages are high diffuse reflectivity (50%), increasing total duffuse reflectivity by 11%, and not decreasing reflectivity after using it for a long time.
Description
The present invention relates to a kind of solar diffuse reflector, belong to the solar energy utilization technique field, be applicable to solar vacuum tube collector, direct insertion vacuum tube solar water-heater.
Usually solar vacuum tube collector is made up of vacuum solar collector tubes 1-1, union pipe 1-2, diffuse reflector 1-3, tailstock 1-4, support 1-5, as shown in Figure 1.Direct insertion vacuum tube solar water-heater then is made up of vacuum solar collector tubes 2-1, water tank 2-2, diffuse reflector 2-3, tailstock 1-4, support 1-5, as shown in Figure 2.No matter be vacuum solar heat collector or direct insertion vacuum solar water heater, diffuse reflector all is one of important building block, and the height of the reflectivity of diffuse reflector is one of key factor that influences heat collector, water heater collecting efficiency, therefore, those skilled in the art of the present technique develop the diffuse reflector of different shape for the reflectivity that improves diffuse reflector, as flat, curved face type or folding face (
Deng) formula or the like.From the selection of diffuse reflector, a large amount of explorations and research have also been carried out, as adopt and be coated with the shoe white paint on the metallic plate, the reflector that this material is made is often because the metallic plate preservative treatment is bad, left and right sides metallic plate will corrosion cause white paint to come off in 1 year, and reflectivity is sharply descended; Adopt the corrosion resistant plate of polishing to make diffuse reflector, not only total reflectivity is lower, and price is higher.Present more employing aluminium sheet is made diffuse reflector, and its diffuse reflectance is 0.4, and total reflectivity is 0.7, but slowly corrosion and the oxidation of its surface reduces its total reflectivity; Also have abroad and adopt the steel plate of going up white glaze, its total reflectivity is 0.74.
The objective of the invention is to adopt a kind of new material to make diffuse reflector, improve reflectivity.
Technical essential of the present invention is to adopt the cotton ginning aluminium sheet to make diffuse reflector.
Said cotton ginning aluminium sheet is meant that the surface manifests the aluminium sheet of rough impression pattern through after rolling processing.
The unidirectional degree of depth t 〉=0.01mm of said rough impression pattern, as shown in Figure 3.
Said aluminium sheet comprises commercial-purity aluminium and aluminium alloy.
The original thickness d of aluminium sheet is preferably 0.4mm～1.5mm, thickness d less than 0.4mm or greater than 1.5mm also can, as long as can make the cotton ginning aluminium sheet that meets above-mentioned requirements, light thermal property is unaffected, can use, just the too thin diffuse reflector intensity difference of aluminium sheet in the same old way; Too thick materials are many, the cost height.
The cotton ginning surface of aluminum plate also can have one deck alumina protective layer, to prevent and to subtract the corrosion of sewing the cotton ginning aluminium sheet, makes reflector keep having over a long time high reflecting properties.
The thickness of alumina layer is not more than 10 μ m, is preferably 1-3 μ m.
Advantage of the present invention is 1. reflectivity height: diffuse reflectance is 0.6 (AM
2) exceeding 50% than the diffuse reflectance 0.4 of general industry pure aluminum plate, total reflectivity is 0.78, exceeds 11% than general industry pure aluminum plate 0.7; 2. the life-span is long; 3. attractive in appearance.
Description of drawings:
Accompanying drawing 1 is the solar vacuum tube collector structure chart.
Accompanying drawing 2 is direct insertion vacuum tube solar water-heater structure charts.
Accompanying drawing 3 is the unidirectional degree of depth schematic diagrames of the rough impression pattern of cotton ginning aluminium sheet.
Embodiment
Condition: the all-glass vacuum thermal-collecting tube length of Solar Energy ﹠ Electronic Factory, Qinghua Univ production is 1.2 meters, and the diameter of cover glass tube is 47mm, and the diameter of inner glass tube is 37mm.Fill water in the pipe, place in the north-south, and the sun is bordering on vertical incidence, 10 ℃～11 ℃ of environment temperatures, and on the same day, the behind of test set heat pipe is an ordinary aluminum plate, and the behind of test set heat pipe is the cotton ginning aluminium sheet.
The irradiation of record water temperature sun when 25 ℃ rise to 60 ℃:
| Diffuse reflector | Temperature rise needs solar irradiation amount (W.h/) m2 for 35 ℃ | |
| ????1 | ????2 | |
| Ordinary aluminum plate | ????911.8 | ????943.2 |
| The cotton ginning aluminium sheet | ????802.5 | ????849.0 |
As calculated, the cotton ginning aluminium sheet solar irradiation amount more required than ordinary aluminum plate lacked about 12 percentage points.
Embodiment 2,
Condition: four blocks of series connection all-glass vacuum solar thermal-arrest plates, every thermal-arrest plate daylighting area is 0.76m * 1.14m, 12 of all-glass vacuum thermal-collecting tubes, the union pipe of the employing U type pipe racks aluminium wing, water tank capacity is 340 liters.Relatively diffuse reflector is respectively under ordinary aluminum plate and the cotton ginning aluminium sheet situation, and the water tank water temperature is from 15 ℃ of collecting efficiencies that rise to 45 ℃ of said system.
The result: ordinary aluminum plate is done diffuse reflector, and system's collecting efficiency is 55.1%.
The cotton ginning aluminium sheet is done diffuse reflector, and system's collecting efficiency is 58.8%.
System effectiveness has improved 3.7 percentage points.
Claims (10)
1, a kind of solar diffuse reflector is characterized in that adopting the cotton ginning aluminium sheet to make.
2,, it is characterized in that said cotton ginning aluminium sheet is meant aluminium sheet after rolling processing, has manifested rough impression pattern on its surface according to the said solar diffuse reflector of claim 1.
3,, it is characterized in that the unidirectional degree of depth t 〉=0.01mm of said rough impression pattern according to the said solar diffuse reflector of claim 2.
4,, it is characterized in that said aluminium sheet comprises commercial-purity aluminium and aluminium alloy according to the said solar diffuse reflector of claim 2.
5,, it is characterized in that said aluminium sheet original thickness d is preferably 0.4mm～1.5mm according to claim 2 and 4 said solar diffuse reflectors.
6,, it is characterized in that said aluminium sheet original thickness d also can be less than 0.4mm according to claim 2 and 4 said solar diffuse reflectors.
7,, it is characterized in that said aluminium sheet original thickness d also can be greater than 1.5mm according to claim 2 and 4 said solar diffuse reflectors.
8,, it is characterized in that said cotton ginning surface of aluminum plate can have one deck alumina protective layer according to the said solar diffuse reflector of claim 1.
9,, it is characterized in that the thickness of said alumina protective layer is not more than 10 μ m according to the said solar diffuse reflector of claim 8.
10,, it is characterized in that the thickness of said alumina protective layer is preferably 1-3 μ m according to the said solar diffuse reflector of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120442A CN1075624C (en) | 1996-11-01 | 1996-11-01 | Solar diffuse reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120442A CN1075624C (en) | 1996-11-01 | 1996-11-01 | Solar diffuse reflector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1181489A true CN1181489A (en) | 1998-05-13 |
| CN1075624C CN1075624C (en) | 2001-11-28 |
Family
ID=5126333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96120442A Expired - Fee Related CN1075624C (en) | 1996-11-01 | 1996-11-01 | Solar diffuse reflector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1075624C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273238B (en) * | 2005-08-02 | 2010-04-07 | 桑斯翠普有限公司 | Nickel-alumina coated solar absorbers |
| CN108330449A (en) * | 2018-01-04 | 2018-07-27 | 苏州市唯嘉光学有限公司 | High diffusing reflection aluminium film on frosting and preparation method thereof |
-
1996
- 1996-11-01 CN CN96120442A patent/CN1075624C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273238B (en) * | 2005-08-02 | 2010-04-07 | 桑斯翠普有限公司 | Nickel-alumina coated solar absorbers |
| CN108330449A (en) * | 2018-01-04 | 2018-07-27 | 苏州市唯嘉光学有限公司 | High diffusing reflection aluminium film on frosting and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1075624C (en) | 2001-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| 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. |
|
| 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. |
|
| 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 |