CN101697032B - Compound paraboloid condenser - Google Patents
Compound paraboloid condenser Download PDFInfo
- Publication number
- CN101697032B CN101697032B CN2009100352705A CN200910035270A CN101697032B CN 101697032 B CN101697032 B CN 101697032B CN 2009100352705 A CN2009100352705 A CN 2009100352705A CN 200910035270 A CN200910035270 A CN 200910035270A CN 101697032 B CN101697032 B CN 101697032B
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- cpc
- condenser
- reflecting surface
- curve
- angle
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000013256 coordination polymer Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 241001424688 Enceliopsis Species 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000001932 seasonal effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000005466 cherenkov radiation Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
Abstract
The invention relates to a compound paraboloid condenser which belongs to the field of solar energy utilization. An ordinary CPC curve is rotated by 2-5 degrees towards the central line of the condenser around an upper edge point of the CPC curve to form a new CPC curve, wherein the best rotating angle is 3 degrees; and dielectric media are filled between the new curve and the original curve to form a novel CPC condenser. The outer surface of the condenser can achieve sunlight reflection by adopting a metal reflecting plane or a reflecting coating. The novel CPC condenser can achieve the CPC optical efficiency of the same concentrating ratio and increase the receiving half-angle of the compound paraboloid condenser to solar rays.
Description
Affiliated technical field
The present invention relates to a kind of beam condensing unit of non-imaging, belong to field of solar energy utilization.
Background technology
Compound parabolic concentrator (CPC), in high-energy physics experiment, faint Cherenkov radiation succeeds in developing in order to detect by the Winston of Univ Chicago USA professor (Winston).Be a kind of non-imaging condenser, given reception can be collected on the receiver by desirable optically focused ratio the incident ray in the scope according to the design of edge optical principle.It is made up of two grooved parabolic mirrors, and absorber is installed in the bottom, and its accessible optically focused ratio is generally below 10.The incident sunray arrives receiving plane by reflection several times in CPC, it is less to run off, and also can effectively collect the sunshine of oblique incidence.This condenser optically focused and not imaging, thereby when work, only need do seasonal adjustment, need not Continuous Tracking.When optically focused than 3 when following, can be used as the fixedly condenser that must not adjust.CPC not only can receive the direct projection solar radiation, can also well receive scattered radiation.To caustic surface type requirement on machining accuracy is not very strict, again need not follower, and prospect is commonly employed.
In the latter stage seventies, research work has remarkable progress, and content comprises the design studies of combining of CPC and multi-form receiver and CPC, analysis and research that optical property and the thermal behavior of CPC are carried out system etc.But in these researchs, the receiver major part of CPC is dull and stereotyped receiver, has only a small amount of antivacuum pipe receiver and few vacuum pipe receiver, and based on little optically focused ratio, be mainly used in solar water heater or hot-water heating system, economy and practicality are not strong.The research emphasis of CPC is tubular type (comprising antivacuum pipe and vacuum tube) over nearly 10 years, and purpose is in order to obtain the thermal barrier of higher temperature, or even obtains steam.For example Yuan of University Of Xiangtan triumph waits to mention with solar heat pipe collector and combines with the CPC system, and production employing geometric concentrating ratio is 5 CPC system, 160 ℃ of saturated steams that finally obtain.Another focus that CPC is studied is combined by CPC and photovoltaic cell and forms concentration photovoltaic system (CPC-PV) now.The Shu Yuan of Xi'an Communications University etc. have carried out numerical simulation calculation to the performance of an asymmetric CPC-PV system, draw the output power that adopts the CPC condenser not only can improve photovoltaic cell, can also the balance photovoltaic cell in the power output in summer in winter.
The main part of common CP C is two parabolic reflecting plate, profile such as accompanying drawing 1.AD and BC are para-curve among the figure, about the central shaft symmetry; AC and BD are the incident restraining line of CPC, respectively with parabolical spindle parallel (or being the main shaft of CPC); (length is d to AB
1) be the opening of CPC, (length is d to CD
2) be its receiving plane; Incident restraining line and axis of symmetry angle are called reception half-angle (representing with θ).When the angle of incidence of light from the incident of CPC upper end open is less than or equal to θ, can be directly or penetrate through the lower ending opening of the final CPC of reflection and to be utilized, and when incident angle during greater than θ, light through repeatedly reflect from the upper port ejaculation can not be utilized.So θ is the parameter of a key in CPC, its size has directly determined the geometric concentrating ratio C of CPC:
C＝1/sinθ
The reflecting surface parabolic equation:
Y＝X
2/4f
Wherein f is a focal length:
f＝d
2(sinθ+1)/2
There is a very important defective in such CPC, and promptly along with the increase of optically focused ratio, the reception half-angle of CPC reduces gradually, and the sunray that CPC receives reduces gradually, and optical efficiency decreases.
Summary of the invention
The object of the present invention is to provide that a kind of that sunshine is received half-angle is bigger, and do not lose the compound parabolic concentrator of its optical efficiency.
A kind of compound parabolic concentrator, the parabolic equation of its reflecting surface is determined by optically focused ratio and bottom surface length, it is characterized in that: have dielectric layer in reflecting surface inside, and dielectric layer shape and thickness by the parabola of reflecting surface around its coboundary point inwardly rotation 2-5 degree form.
The parabola of above-mentioned reflecting surface around its coboundary point inwardly the angle of rotation be 3 the bests when spending, both increased the reception half-angle of CPC to sunshine this moment, do not lose its optical efficiency again.
Above-mentioned reflecting surface can be metallic reflection face.The perhaps reflective coating that is covered with for the dielectric layer outside surface.
The present invention has overcome when CPC optically focused ratio increases, and receives half-angle and reduces, and condenser optics efficient reduces, and need make the defective that seasonal form is adjusted, and has enlarged the reception half-angle of CPC to sunshine, and has not lost its optical efficiency.
Description of drawings
Fig. 1 is the profile structural drawing of common CP C.
Fig. 2 is the paraboloidal structural drawing of NEW TYPE OF COMPOSITE of the present invention.
Number in the figure title, 1. para-curve reflecting surface, 2. receiving plane, 3. dielectric.
Embodiment
The technical solution adopted for the present invention to solve the technical problems is: two curves of common CP C are formed a new CPC curve around its coboundary point to CPC centerline direction rotation 2-5 degree respectively.Filling dielectric material between new and old two CPC curves, be covered with reflective coating (coating should be selected the high material of reflectance such as the adiabatic enamel coating of space, AP-35 etc.) at the dielectric outside surface, perhaps, so just formed a novel CPC condenser at metal (as aluminium, the iron etc.) reflecting surface of additional one of dielectric outside surface.When passing through a series of refractions and reflection when injecting condenser after, sunray (in the range of receiving) injects the receiving plane of condenser bottom.
Above-mentioned dielectric substance answers selective transmittance and refractive index higher, and general transmissivity requires greater than 0.9, and refractive index is considered the material cost problem simultaneously greater than 1.4.Because transmissivity is high more, light losing is few more; Refractive index is high more, and is big more to the reception half-angle of sunshine.Optionally material have acrylic acid, glass, etc.
As shown in Figure 2, the present invention mainly is made up of two reflection paraboloids and inner one deck dielectric (acrylic acid) thereof.Sunshine (in range of receiving) is injected condenser, through cavity, in dielectric 3, reflect, being reflected property coating or metallic surface 1 reflection then, through a series of like this refraction and reflection, light is finally injected the receiving plane 2 of CPC bottom, wherein because dielectric existence has effectively enlarged the reception half-angle of condenser to sunshine.
Common CP C optically focused ratio is 4 o'clock, and it receives half-angle:
θ=arcsin (1/C)=arcsin (1/4) ≈ 14.5 (degree)
Ray trace software RADIANCE simulation by a kind of pin-point accuracy draws when adopting acrylic acid (transmissivity is 0.93, and refractive index is 1.5) to be dielectric substance, and reflecting surface is aluminium (reflectivity 0.9), and intensity of solar radiation is 800W/m
2The time, the present invention (corresponding common optically focused is than the CPC that is 4) anglec of rotation is 3 to receive half-angle when spending and reached 25 degree, its optical concentration ratio is about 6; When the anglec of rotation is 2 when spending, it receives half-angle is 21 degree, and the optically focused ratio is about 5.3; When the anglec of rotation is 5 when spending, receives half-angle and reach 28 degree, but optically focused is 6 than still that as seen its optical efficiency is lost and required dielectric substance increases, and has increased material cost.So the invention has the beneficial effects as follows and enlarge the reception half-angle of CPC to sunshine, thereby avoid it is made seasonal orientation adjustment, and when the anglec of rotation is 3 to be optimal case when spending, and has not only effectively enlarged this moment the reception half-angle of sunshine but also does not lose its optical efficiency.
Claims (4)
1. compound parabolic concentrator, the parabolic equation of its reflecting surface is determined by optically focused ratio and bottom lengths, it is characterized in that: have dielectric layer in reflecting surface inside, and dielectric layer shape and thickness by the parabola of reflecting surface around its coboundary point inwardly rotation 2-5 degree form; The material therefor transmissivity of above-mentioned dielectric layer is greater than 0.9, and refractive index is greater than 1.4.
2. compound parabolic concentrator according to claim 1 is characterized in that: the angle that the parabola of above-mentioned reflecting surface inwardly rotates around its coboundary point is 3 degree.
3. compound parabolic concentrator according to claim 1 is characterized in that: above-mentioned reflecting surface is a metallic reflection face.
4. compound parabolic concentrator according to claim 1 is characterized in that: the reflective coating that above-mentioned reflecting surface is covered with for the dielectric layer outside surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100352705A CN101697032B (en) | 2009-09-23 | 2009-09-23 | Compound paraboloid condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100352705A CN101697032B (en) | 2009-09-23 | 2009-09-23 | Compound paraboloid condenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101697032A CN101697032A (en) | 2010-04-21 |
| CN101697032B true CN101697032B (en) | 2011-11-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100352705A Expired - Fee Related CN101697032B (en) | 2009-09-23 | 2009-09-23 | Compound paraboloid condenser |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887165B (en) * | 2010-06-30 | 2012-04-25 | 徐国彬 | Super paraboloid solar energy concentrator |
| CN102081224B (en) * | 2010-10-13 | 2012-05-23 | 徐诵舜 | Solar photovoltaic A type condenser |
| CN102779885A (en) * | 2012-07-02 | 2012-11-14 | 西安交通大学 | Solar energy concentrating frequency dividing photovoltaic photo-thermal cogeneration device |
| CN103792650A (en) * | 2014-02-28 | 2014-05-14 | 陕西师范大学 | Funnel-shaped optical energy current density multiplier |
| CN104601096B (en) * | 2015-01-26 | 2016-08-17 | 西安交通大学 | A kind of slot type uniform condensing uniaxiality tracking solar energy photovoltaic generator |
| CN105116528B (en) * | 2015-08-28 | 2017-11-10 | 中国科学技术大学先进技术研究院 | A kind of scatter-type fire smog detector and its concentrator |
| CN105890189B (en) * | 2016-04-07 | 2017-12-01 | 中国华能集团清洁能源技术研究院有限公司 | The photo-thermal joint modeling method of compound parabolic concentrator |
| CN108131263A (en) * | 2018-01-19 | 2018-06-08 | 中国科学院光电技术研究所 | Tower type solar thermal power generation system with compound parabolic condenser |
| CN115598816B (en) * | 2022-12-07 | 2023-04-21 | 昆明理工大学 | Non-imaging condenser with separated surface and construction method of mathematical model of non-imaging condenser |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193747A (en) * | 1998-04-24 | 1998-09-23 | 清华大学 | Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror |
| CN201594157U (en) * | 2009-09-23 | 2010-09-29 | 南京航空航天大学 | Composite parabolic condenser |
-
2009
- 2009-09-23 CN CN2009100352705A patent/CN101697032B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193747A (en) * | 1998-04-24 | 1998-09-23 | 清华大学 | Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror |
| CN201594157U (en) * | 2009-09-23 | 2010-09-29 | 南京航空航天大学 | Composite parabolic condenser |
Non-Patent Citations (1)
| Title |
|---|
| 袁胜利等.用于发电的太阳能聚光热管集热器.《节能》.2002,(第241期),14-17. * |
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| CN101697032A (en) | 2010-04-21 |
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