CN102486341A - Fresnel solar collector and light condensation unit thereof - Google Patents
Fresnel solar collector and light condensation unit thereof Download PDFInfo
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- CN102486341A CN102486341A CN2010105005662A CN201010500566A CN102486341A CN 102486341 A CN102486341 A CN 102486341A CN 2010105005662 A CN2010105005662 A CN 2010105005662A CN 201010500566 A CN201010500566 A CN 201010500566A CN 102486341 A CN102486341 A CN 102486341A
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- receiver
- solar collector
- fresnel solar
- light condensation
- focusing unit
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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
Abstract
The invention provides a Fresnel solar collector and a light condensation unit thereof. The Fresnel solar collector comprises a receiver and a light condensation module, the light condensation module is used for reflecting sunlight to the receiver, the receiver is arranged on the light condensation module through a bracket, the light condensation module comprises a plurality of light condensation units, each light condensation unit comprises a plurality of plane mirrors, and the plane mirrors are arranged in parallel to form an arc-shaped light condensation surface. Since the plane mirrors are used as the light condensation module, the cost can be saved. The defect of non-uniform heating of heat transfer fluid in the heat absorption pipe of the existing receiver can be overcome, and the improvement of the heat absorption efficiency can be facilitated.
Description
Technical field
The present invention relates to a kind of solar thermal collector and light focusing unit thereof, and be particularly related to a kind of Fresnel solar collector and light focusing unit thereof.
Background technology
Fresnel solar collector mainly comprises a linear Fresnel reflector (Linear Fresnel Reflector; LFR) system and a receiver; This linear Fresnel reflector system comprises a linear reflective device field; This linear reflective device field is made up of a plurality of reflectors that laterally arrange side by side, and these reflectors can drive to follow the tracks of sun's motion through a tracking means simultaneously.The sunshine of these reflector reflects is concentrated directive to be arranged in the receiver of these reflector tops, converts solar energy into heat energy through this receiver.A common receiver can be arranged between a plurality of reflectors, so that receive the sunshine of these a plurality of reflector reflects.This relevant prior art can be consulted the PCT patent application that publication number is WO2009/023063; The absorber of the Fresnel solar collector that this patent application disclosed is provided with a plurality of endothermic tubes parallel with the speculum of reflector in the centre; And reflecting element is set in the side of this absorber; So a part exposes on the endothermic tube after the sunshine of reflector reflects can pass through this reflected again, and the weak point of this kind structure is because of endothermic tube runs through whole receiver, and the part endothermic tube possibly make its inner heat-transfer fluid heating because raying is concentrated fully; Thereby can absorb the heat energy of heap(ed) capacity; And the endothermic tube that is in the edge makes the heat-transfer fluid heating in it insufficient because of raying is less, thereby fails to make full use of the heat absorption capacity of heat-transfer fluid, thereby is unfavorable for improving heat absorption efficiency.Moreover because the raying of part endothermic tube is concentrated, temperature is higher, and corresponding thermal deformation is bigger; The endothermic tube at edge then is out of shape less, and consider this kind situation when so needing design and do corresponding processing in system, thus the complexity that the increase system designs; When particularly if endothermic tube is longer, the uneven situation of this kind thermal deformation will be more serious, in addition; The speculum of solar thermal collector adopts the arc like reflection mirror mostly at present, and cost is higher, is unfavorable for reducing cost.
Summary of the invention
The object of the present invention is to provide a kind of cost low and help improving the heat collector and the light focusing unit thereof of heat absorption efficiency, solve the too high problem of light focusing unit expense that exists in the prior art.
To achieve these goals, the invention provides a kind of light focusing unit of Fresnel solar collector, said light focusing unit is made up of a plurality of level crossings, and said a plurality of level crossings are each other side by side placed, and forms a circular-arc caustic surface jointly.
To achieve these goals, the present invention also provides a kind of Fresnel solar collector, comprises receiver and concentration module; Wherein said this concentration module is in order to reflex to sunshine said receiver; And this receiver is through being set up in the top of concentration module, and said concentration module comprises a plurality of light focusing unit, and each said light focusing unit is formed by a plurality of level crossings; Said a plurality of level crossing is each other side by side placed, and forms a circular-arc caustic surface jointly.
Optional, said receiver is divided into several sections, connects through a transfer tube between every section, and every section endothermic tubes that include a series of extensions that are parallel to each other of said receiver, the two ends of said endothermic tube all are connected with the transfer tube at this section receiver two ends.
Optional, said endothermic tube surface is coated with semiconductor absorption layer and protective oxide film successively.
Optional; A series of common cavitys that form of said endothermic tube that are parallel to each other and extend of every section said receiver; And said cavity is provided with an opening in the face of an end of concentration module, and the sunshine that focuses on from concentration module gets into cavity from opening, and in cavity, repeatedly reflects and be absorbed.
Optional, the cavity of said receiver is arch or horseshoe-shaped structure.
Optional, every section said receiver two ends are provided with mounting flange, are provided with splitter box between the mounting flange, and this splitter box one end is connected with transfer tube, and the other end is connected with all endothermic tube ports.
Owing to adopted technique scheme; Compared with prior art; The present invention has the following advantages: Fresnel solar collector of the present invention and light focusing unit thereof can overcome in the existing receiver endothermic tube heat-transfer fluid uneven defective of being heated; Thereby be more conducive to improve heat absorption efficiency, also can overcome the uneven defective of endothermic tube temperature distortion simultaneously; Utilize a plurality of level crossings to form circular-arc caustic surface, reach the colleague of spotlight effect, reduced cost.
Description of drawings
Fig. 1 is the light focusing unit structural representation of Fresnel solar collector of the present invention and light focusing unit thereof.
Fig. 2 is the light focusing unit vertical view of Fresnel solar collector of the present invention and light focusing unit thereof.
Fig. 3 is the collector structure sketch map of Fresnel solar collector of the present invention and light focusing unit thereof.
The specific embodiment
Do detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
At first; Please refer to Fig. 1 and Fig. 2, Fig. 1 is the light focusing unit structural representation of Fresnel solar collector of the present invention and light focusing unit thereof, and Fig. 2 is the light focusing unit vertical view of Fresnel solar collector of the present invention and light focusing unit thereof; Said light focusing unit 11 is made up of a plurality of level crossings 12; Said a plurality of level crossing 12 is placed each other side by side, forms a circular-arc caustic surface jointly, and sun directional light is mapped to and is reflected onto heat collector 14 on the level crossing.Because the cost that uses level crossing is far below circular-arc condenser, therefore, this structure greatly reduces cost under the prerequisite that guarantees spotlight effect.
Then, please refer to Fig. 3, Fig. 3 comprises concentration module 100 and receiver 20 for the collector structure sketch map of Fresnel solar collector of the present invention and light focusing unit thereof, this Fresnel solar collector.Concentration module 100 usefulness supports 20 support; Wherein said this concentration module 100 is in order to reflex to sunshine said receiver 20; And this receiver 20 is through being set up in the top of concentration module 100, and said concentration module 100 comprises a plurality of light focusing unit, and each said light focusing unit is formed by a plurality of level crossings; Said a plurality of level crossing is each other side by side placed, and forms a circular-arc caustic surface jointly.This solar tracking structure has description in the prior art, no longer specifies here.
Said receiver 20 is divided into several sections, connects through a transfer tube between every section, and every section endothermic tubes that include a series of extensions that are parallel to each other of said receiver 20, the two ends of said endothermic tube all are connected with the transfer tube at this section receiver 20 two ends.Said endothermic tube surface is coated with semiconductor absorption layer and protective oxide film successively.A series of common cavitys that form of said endothermic tube that are parallel to each other and extend of every section said receiver 20; And said cavity is provided with an opening in the face of an end of concentration module 100; The sunshine that focuses on from concentration module 100 gets into cavity from opening, and in cavity, repeatedly reflects and be absorbed.The cavity of said receiver 20 is arch or horseshoe-shaped structure.Every section said receiver 20 two ends are provided with mounting flange, are provided with splitter box between the mounting flange, and this splitter box one end is connected with transfer tube, and the other end is connected with all endothermic tube ports.
Owing to the solar radiation energy that reaches 45% mainly concentrates in the spectral region of wavelength for the visible light of (0.3-0.7 μ m); Therefore can be coated with coated semiconductor and protective oxide film successively on the endothermic tube surface; This coated semiconductor is as coating for selective absorption; In field of solar energy utilization, desirable selectivity absorbing material is the visible light part absorption fully to sunshine, and promptly the light absorption to visible light wave range is high; And infrared band is had very high reflectivity; Simultaneously also utilize the low infrared emissivity of base metal material (metal heat absorption tube) and improve the infrared reflectivity of whole endothermic tube, promptly reduce the emissivity of region of ultra-red as far as possible, to reduce the black body radiation of receiver.Owing to have energy gap Eg in the semi-conducting material; It can only absorb the wavelength of energy greater than Eg; So there is a cutoff wavelength λ c (λ c (μ m)=1.24/Eg (eV)), promptly have only visible, the ultraviolet light of wavelength X＜λ c etc., can make just that electronics generation transition gets into conduction band in the semiconductor; Cause particle collision in electronics and the lattice, luminous energy is converted into heat energy; And see through this coated semiconductor because of low not being absorbed of energy for the infrared light of wavelength X＞λ c, and utilize the high reflection characteristic of metal heat absorption tube (being generally copper or iron) to reflect out, thus constituted the spectral selection absorption of coated semiconductor.Usually the energy gap of Ge, Si, GaAs at room temperature is respectively 0.66eV, 1.12eV, 1.42eV; Be that its corresponding cutoff wavelength λ c (μ m) should be 1.88,1.11,0.87 mutually, so wavelength is that the visible light of (0.3-0.7 μ m) all can well be absorbed by the coating of above-mentioned semi-conducting material.
And this protective oxide film mainly is the very little dielectric of extinction coefficient, like Al
2O
3, SiO
2Deng; Thickness normally in 1/4th visible wavelength ranges, can play the effect of anti-reflection visible light, and this protective oxide film has stronger resistance to corrosion and heat endurance simultaneously; Thereby also can protect coated semiconductor and metal heat absorption tube, anti-oxidation and corrosion.
Compared with prior art, the present invention connects through a transfer tube between every section through receiver is divided into several sections; And every section endothermic tubes that include a series of extensions that are parallel to each other of receiver; The two ends of these endothermic tubes all are connected with the transfer tube at this section receiver two ends, and through setting like this, the heat-transfer fluid that flows out from the endothermic tube of every section receiver flows into the transfer tube mixes; Heat-shift; Flow into again in next section receiver afterwards and absorb heat, so can make full use of the heat absorption capacity of heat-exchange fluid, and overcome in the existing receiver endothermic tube heat-transfer fluid uneven defective of being heated; Thereby be more conducive to improve heat absorption and heat transfer efficiency, also can overcome the uneven defective of endothermic tube temperature distortion simultaneously.Simultaneously transparent cover body and sealing are made as vacuum between the lid, thereby can effectively reduce the convection heat losses, improve the heat absorption efficiency of receiver; And through coated semiconductor and protective oxide film being set on the endothermic tube surface; Can be also with better absorption sunshine, and external irradiating infrared light, thereby make the thermal equilibrium temperature of this receiver cavity less; With black body radiation and the raising luminous energy-thermal energy conversion efficiency that reduces receiver; Utilize protective oxide film can make coated semiconductor and metal heat absorption tube and air insulated simultaneously, thereby avoid coated semiconductor and metal heat absorption tube oxidation, thus the service life of increase receiver.
Though oneself discloses the present invention as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art are not breaking away from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (7)
1. the light focusing unit of a Fresnel solar collector, it is characterized in that: said light focusing unit is made up of a plurality of level crossings, and said a plurality of level crossings are placed each other side by side, form a circular-arc caustic surface jointly.
2. Fresnel solar collector; Comprise receiver and concentration module, wherein said this concentration module is in order to reflexing to sunshine said receiver, and this receiver is through being set up in the top of concentration module; It is characterized in that: said concentration module comprises a plurality of light focusing unit; Each said light focusing unit is formed by a plurality of level crossings, and said a plurality of level crossings are each other side by side placed, and forms a circular-arc caustic surface jointly.
3. Fresnel solar collector as claimed in claim 2; It is characterized in that: said receiver is divided into several sections; Connect through a transfer tube between every section; And every section of said receiver includes a series of endothermic tubes that are parallel to each other and extend, and the two ends of said endothermic tube all are connected with the transfer tube at this section receiver two ends.
4. Fresnel solar collector as claimed in claim 3 is characterized in that: said endothermic tube surface is coated with semiconductor absorption layer and protective oxide film successively.
5. Fresnel solar collector as claimed in claim 3; It is characterized in that: a series of common cavitys that form of said endothermic tube that are parallel to each other and extend of every section said receiver; And said cavity is provided with an opening in the face of an end of concentration module; The sunshine that focuses on from concentration module gets into cavity from opening, and in cavity, repeatedly reflects and be absorbed.
6. Fresnel solar collector as claimed in claim 2 is characterized in that: the cavity of said receiver is arch or horseshoe-shaped structure.
7. Fresnel solar collector as claimed in claim 2 is characterized in that: every section said receiver two ends are provided with mounting flange, are provided with splitter box between the mounting flange, and this splitter box one end is connected with transfer tube, and the other end is connected with all endothermic tube ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105005662A CN102486341A (en) | 2010-12-06 | 2010-12-06 | Fresnel solar collector and light condensation unit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105005662A CN102486341A (en) | 2010-12-06 | 2010-12-06 | Fresnel solar collector and light condensation unit thereof |
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| CN102486341A true CN102486341A (en) | 2012-06-06 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156502A (en) * | 1994-07-19 | 1997-08-06 | 阿努泰克Pty有限公司 | Improved solar collector |
| CN2553309Y (en) * | 2002-03-20 | 2003-05-28 | 西北轻工业学院 | Solar condenser with parabolic reflector |
| CN101546033A (en) * | 2009-01-11 | 2009-09-30 | 冯益安 | Compound plane slot-type optical collector |
| CN101655287A (en) * | 2009-09-07 | 2010-02-24 | 东南大学 | Optical collector with multi-section circular arc |
| CN101846402A (en) * | 2010-05-28 | 2010-09-29 | 益科博能源科技（上海）有限公司 | Fresnel solar collector |
| CN201652857U (en) * | 2010-02-09 | 2010-11-24 | 李忠孝 | Large-scale solar energy heat-collecting device |
-
2010
- 2010-12-06 CN CN2010105005662A patent/CN102486341A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156502A (en) * | 1994-07-19 | 1997-08-06 | 阿努泰克Pty有限公司 | Improved solar collector |
| CN2553309Y (en) * | 2002-03-20 | 2003-05-28 | 西北轻工业学院 | Solar condenser with parabolic reflector |
| CN101546033A (en) * | 2009-01-11 | 2009-09-30 | 冯益安 | Compound plane slot-type optical collector |
| CN101655287A (en) * | 2009-09-07 | 2010-02-24 | 东南大学 | Optical collector with multi-section circular arc |
| CN201652857U (en) * | 2010-02-09 | 2010-11-24 | 李忠孝 | Large-scale solar energy heat-collecting device |
| CN101846402A (en) * | 2010-05-28 | 2010-09-29 | 益科博能源科技（上海）有限公司 | Fresnel solar collector |
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Application publication date: 20120606 |