CN1060857C - Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror - Google Patents
Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror Download PDFInfo
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- CN1060857C CN1060857C CN98101632A CN98101632A CN1060857C CN 1060857 C CN1060857 C CN 1060857C CN 98101632 A CN98101632 A CN 98101632A CN 98101632 A CN98101632 A CN 98101632A CN 1060857 C CN1060857 C CN 1060857C
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- compound parabolic
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 102
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 230000007704 transition Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- SUBPBOVIYZLZKW-SSDOTTSWSA-N (2r)-4-(3-carboxypropyl)piperazine-2-carboxylic acid Chemical compound OC(=O)CCCN1CCN[C@@H](C(O)=O)C1 SUBPBOVIYZLZKW-SSDOTTSWSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/80—Arrangements for concentrating solar-rays for solar heat collectors with reflectors having discontinuous faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S2023/83—Other shapes
- F24S2023/834—Other shapes trough-shaped
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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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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- Optical Elements Other Than Lenses (AREA)
Abstract
The present invention belongs to the technical field of solar light collection. A double-grade compound parabolic lens comprises an upper grade compound object lens and a lower grade compound parabolic lens, wherein an acceptance semi-angle of phi a is formed between the upper grade compound parabolic lens and a compound parabola which is axisymmetric with a light collector; an acceptance semi-angle of phi b is formed between the lower grade compound parabolic lens and the compound parabola. A transitional grade Fresnel reflector is based on a pair of parallel lines being connected with the absorption end of the upper grade compound parabolic lens and the opening end of the lower grade compound parabolic lens. A steering reflector is arranged on the connecting position between the Fresnel reflector and the absorption end of the upper grade compound parabolic lens. The present invention overcomes the mutual restriction contradiction of the two primary functions of concentration ratio enhancement and the enlargement of an acceptance angle range of a single-grade compound parabolic lens and has the advantages of efficiency enhancement and cost reduction.
Description
The invention belongs to the Salar light-gathering technical field.
Heliotechnics popularize the economy will depend primarily on it, in view of sun power high-grade, low-density feature, the subject matter that causes influencing the heliotechnics economy be improve focus on than and high tracking cost between contradiction.
Focus on the contradiction that compares with high tracking cost in order to solve to improve, the Hinterberger of the U.S. and Winston (1996) have invented compound parabolic mirror condenser (Compound ParabolicConcentrators:CPC).It is holded up the parabolic mirror 11,12 that comes relatively by two and forms, its symmetrical section as shown in Figure 1, it makes the ray of openend (upper port), be collected to absorption edge (lower port) surface, the mirror on the left side and the right belongs to the para-curve of relative tilt, (θ a) receives half-angle, and focus is respectively A, B separately for left and right parabolic lens axis 13,14 and the condenser axis of symmetry 15 formation+θ a.Follow the trail of several rays and show that this covering device has following inclination angle absorption characteristic: all incident angles | θ | the ray that enters openend of＜θ a, to arrive at absorption edge through primary event, as shown in Figure 2: and all inclination angles | θ | the ray of＞θ a will come back reflective repeatedly and finally to flee from openend between two catoptrons, as shown in Figure 3.
The ratio H/A of compound parabolic mirror height H and its A/F A when different reception half-angle θ a with focusing on as shown in Figure 4 than the variation of C.As seen, when the focusing of compound parabolic mirror is 14 than C, receives half-angle θ a and only be 4 ° among the figure, this just needs the constantly inclination angle of adjustment CPC, promptly follows the tracks of the variation at light inclination angle; And when getting 36 ° bigger reception half-angle θ a, it focuses on than only is 1.5; Therefore this compound parabolic mirror technology can't solve to improve at all and focus on the contradiction of following the tracks of with deduction and exemption, and the ratio of performance to price is low, therefore is extensive use of in industrial being difficult to.
The objective of the invention is for overcoming the weak point of prior art, a kind of twin-stage compound parabolic mirror condenser (Double stages CPC:D-CPC) that is connected by the Fresnel reflecting mirror transition is provided, solve single-stage compound parabolic mirror and improve the contradiction that focuses on ratio and enlarge these two major function mutual restriction of acceptance angle scope, raise the efficiency, reduce cost, thereby be implemented in industrial application.
The twin-stage compound parabolic mirror condenser by Fresnel reflecting mirror transition connection of the present invention's design, comprise that two groups of higher level's compound parabolic mirror and reception half-angles that are θ a with axisymmetric reception half-angle are subordinate's compound parabolic mirror of θ b, the transstage Fresnel reflecting mirror of forming by the absorption edge that connects said higher level's compound parabolic mirror and the reflecting surface of one group of angle that changes irregularly of the openend of subordinate's compound parabolic mirror, there is a deviation mirror that becomes θ a/2 inclination angle with the condenser axle this Fresnel reflecting mirror and higher level's compound parabolic mirror absorption edge junction, on the open end width and Fresnel reflecting mirror of the absorption edge width of said higher level's compound parabolic mirror and subordinate's compound parabolic mirror, the width of lower end equates.Transstage length and wide ratio are the cotangent ctg θ b that subordinate's compound parabolic mirror receives half-angle.Higher level's compound parabolic mirror absorption edge end points downwards institute's unspecified angle ray of doing and transstage intersects, and the twice of the included angle of this intersection point place Fresnel reflecting mirror reflecting surface and condenser axis equals 90 ° with angle ω and subordinate's compound parabolic mirror reception half-angle θ b sum on institute's ray of doing and this absorption edge plane.Said twin-stage compound parabolic mirror is made of the twin-stage flute profile compound parabolic mirror solar concentrator of two-dimension focusing said para-curve and Fresnel reflection line segment.Said twin-stage compound parabolic mirror also is made of the twin-stage rotary body compound parabolic mirror solar concentrator of three-dimensional focal said para-curve and Fresnel reflection line segment.
Principle of the present invention is described as follows in conjunction with Fig. 5～7: the twin-stage compound parabolic mirror that the present invention connects for the Fresnel reflecting mirror transition, form by higher level's compound parabolic mirror 51, subordinate's compound parabolic mirror 53 and the Fresnel reflecting mirror transstage 52 that is connected both, as shown in Figure 5.Wherein the function of higher level's compound parabolic mirror is to enlarge the acceptance angle scope as far as possible, can increase the reception to the considerable part diffusion light of the sun like this, and the incident angle of going back the tolerable direct light changes, thereby reduces the tilt adjustment number of times; The function of subordinate's compound parabolic mirror is to increase to focus on ratio as far as possible, to improve the grade of institute's energy collecting.Transstage between the two-stage compound parabolic mirror is provided with two parallel relative Fresnel reflecting mirrors 52, from 54 incidents of higher level's compound parabolic mirror openend, compile and turn to the light of dispersing out, be reflected into the parallel rays that receives half-angle θ b less than subordinate's compound parabolic mirror again through deviation mirror 58 through higher level's compound parabolic mirror 51 reflection.The present invention can avoid single-stage compound parabolic mirror to enlarge acceptance angle and increase the contradiction that focuses between the ratio.
Higher level's compound parabolic mirror receives desirable 9 ° to 36 ° of half-angle θ a, desirable 9 ° to 36 ° of the reception half-angle θ b of subordinate's compound parabolic mirror, and subordinate's compound parabolic mirror openend 56 width and higher level's compound parabolic mirror absorption edge 55 width equate.The focusing of twin-stage compound parabolic mirror is compared amassing than focusing on for upper and lower two-stage compound parabolic mirror.
The purpose of design of transstage deviation mirror 58 is to make to the right the light beam that compiles under (left side) transfer left the light beam of dispersing under (right side) to, and angle ω circle on arbitrary light and higher level's compound parabolic mirror absorption edge plane is between a to 90 ° of θ in the divergent beams.Fig. 6 equals the critical condition of θ a for the sunshine projectional angle.The ratio of transstage length and width is the cotangent ctg θ b that subordinate's compound parabolic mirror receives half-angle θ b.In the light beam that higher level's compound parabolic mirror absorption edge end points is dispersed under (right side) left, angle in every interval (for example 10 °) make its corresponding ray and and limit, a transstage left side (right side) straight line crossing, do a Fresnel reflection face 52 at each intersection point place, the included angle of its plane and condenser axis satisfies following relationship:
2 φ+ω+θ b=90 ° wherein θ b be the reception half-angle of subordinate's compound parabolic mirror.Through the Fresnel reflecting mirror of like this design just can be left (right side) down divergent beams transfer to the right parallel beam under (left side) to, and projectional angle equals the reception half-angle θ b of subordinate's compound parabolic mirror just.
Fig. 7 is 0 ° for projectional angle, i.e. another critical condition when incident beam and condenser parallel axes.Two parabolic lens will throw near parallel beam reflection the becoming absorption edge divergent beams the end points separately on it respectively about higher level's compound parabolic mirror, and the angle on this light beam upper sideline and absorption edge plane also is θ a just, the angle of all the other light increases successively, the Fresnel reflecting mirror of positive good utilisation symmetric design can transfer divergent beams to projectional angle and equal the parallel beam that subordinate's compound parabolic mirror receives half-angle θ b, similar with a last critical condition, once turn to reflection but reduce, only need triple reflection just can finish twice focusing.
Because under above-mentioned two kinds of critical conditions, higher level's compound parabolic mirror (and deviation mirror) all can transfer parallel beam to the downward divergent beams of its absorption edge end points; And during all the other situations, divergence point is between two-end-point, in this moment divergent beams arbitrary light for the projectional angle of Fresnel reflecting mirror than reducing to some extent under the critical condition, therefore light reflected promptly receives half-angle less than it with respect to the also inevitable θ b when critical of the projectional angle of subordinate's compound parabolic mirror.So just guarantee twin-stage compound parabolic mirror in the whole acceptance angle scopes of higher level's compound parabolic mirror continually varying, the parallel sun light beam that is received, its all light can both arrive at the absorption edge of subordinate's compound parabolic mirror.
The present invention has the following advantages:
1, saves reflecting mirror material and expansion acceptance angle scope.
Found and calculate and can be got by accompanying drawing 4, twin-stage compound parabolic mirror of the present invention is when realizing 10 focusing ratios and 21 ° of reception half-angles, and overall height is 4.034 times of higher level's compound parabolic mirror open end width; And single-stage compound parabolic mirror wants to realize 10 focusing ratio, and depth-width ratio then is 5.60, and it receives half-angle and has only 5.7 °, and promptly material therefor increases closely 1/3rd, and the acceptance angle scope is but dwindled 3.68 times.Therefore say twin-stage compound parabolic mirror owing to fully combine focus type compound parabolic mirror and reception type compound parabolic mirror advantage separately, thereby realize its function combinations satisfactoryly.
2, solve the contradiction that focuses on than raising and high tracking cost
The present invention is in order to avoid the cost of following the tracks of realizes the high technology that focuses on ratio, this just makes and utilizes low-density sun power to remove to provide the industrial heat of extensive market, finally become possibility economically, thereby make that solar thermal utilization not merely is a kind of energy technology deposit at future, also, injected new vitality for it adds and the striving unexpectedly of traditional energy technology.And the realization of all these just is being based on high focus on ratio and the final solution of following the tracks of this deep technical contradiction of cost.
Description of drawings:
Fig. 1 is a prior art compound parabolic mirror principle schematic.
Fig. 2 is the reflection characteristic synoptic diagram when to be incident angle less than the compound parabolic mirror receive half-angle θ a.
Fig. 3 is the reflection characteristic synoptic diagram when to be incident angle greater than it receive half-angle θ a.
Fig. 4 is that compound parabolic mirror depth-width ratio H/A is as the funtcional relationship synoptic diagram that focuses on than C and reception half-angle θ a.
Fig. 5 is a structural representation of the present invention.
When Fig. 6 equals to receive half-angle θ a for projectional angle, the index path of twin-stage compound parabolic mirror.
Fig. 7 is incident light when parallel with the condenser axle, the index path of higher level's compound parabolic mirror.
Fig. 8 is the embodiment of the invention one a twin-stage rotary body compound parabolic mirror structural representation.
Fig. 9 is the embodiment of the invention two twin-stage flute profile compound parabolic mirror structural representations.
The present invention designs the embodiment of two kinds of structures, and accompanying drawings is as follows:
Embodiment one:
Embodiments of the invention one are twin-stage rotary body compound parabolic mirrors, its structure as shown in Figure 8, wherein the reception half-angle of higher level's compound parabolic mirror 81 is 21 °, absorption edge 85 diameters are 400mm, openend is clipped one section, and to make its depth-width ratio be 1, actual focusing than being 2.4, and openend 84 width are 960mm, highly be 960mm, transstage 82 length are 400/tg15 °=1493mm; Wherein subordinate's compound parabolic mirror 83 reception half-angles are 15 °, and its openend 86 is clipped one section, and making its depth-width ratio is 1.5, actual focusing than being 3.5, and absorption edge 87 diameters are 114mm, highly are 600mm; The focusing of twin-stage compound parabolic mirror is than being (960/114)
2=71, highly be 3053mm, depth-width ratio is 3.18.When twin-stage compound parabolic mirror absorption edge is settled photovoltaic cell module and constituted photovoltaic generating system, exempting to follow the tracks of under the prerequisite, can save 71 times photovoltaic cell module, thereby reduce the cost of photovoltaic generating system.
Embodiments of the invention two are twin-stage flute profile compound parabolic mirrors, its structure as shown in Figure 9, its upper and lower level compound parabolic mirror 91,93 is two blocks of column parabolical plates of symmetry, and transstage 92 is two parallel Fresnel reflecting mirrors of symmetry, and other dimensional parameters and embodiment one are roughly the same.
Claims (6)
1, a kind of twin-stage compound parabolic mirror condenser that connects by the Fresnel reflecting mirror transition, it is characterized in that, comprising higher level's compound parabolic mirror that two groups of axisymmetric reception half-angles are θ a and receiving half-angle is subordinate's compound parabolic mirror of θ b, the transstage Fresnel reflecting mirror of forming by the absorption edge that connects said higher level's compound parabolic mirror and the reflecting surface of one group of angle that changes irregularly of the openend of subordinate's compound parabolic mirror, there is a steering reflection mirror that becomes θ a/2 inclination angle with the condenser axle this Fresnel reflecting mirror and said higher level's compound parabolic mirror absorption edge junction, on the open end width and Fresnel reflecting mirror of the absorption edge width of said higher level's compound parabolic mirror and subordinate's compound parabolic mirror, the width of lower end equates.
2, condenser as claimed in claim 1 is characterized in that transstage length and wide ratio are the cotangent ctg θ b that subordinate's compound parabolic mirror receives half-angle.
3, condenser as claimed in claim 1, it is characterized in that from higher level's compound parabolic mirror absorption edge end points downwards institute's arbitrary ray of doing and transstage parallel lines have an intersection point, the twice of this intersection point place Fresnel reflection face and condenser axis angle φ equals 90 ° with angle ω and subordinate's compound parabolic mirror reception half-angle θ b sum on institute's ray of doing and higher level's compound parabolic mirror absorption edge plane.
4, condenser as claimed in claim 1, the angle that it is characterized in that steering reflection mirror and condenser axis are that higher level's compound parabolic mirror receives half of half-angle, i.e. θ a/2.
5, condenser as claimed in claim 1 is characterized in that said twin-stage compound parabolic mirror is made of the twin-stage flute profile compound parabolic mirror solar concentrator of two-dimension focusing said compound parabolic and Fresnel reflection line segment.
6, condenser as claimed in claim 1 is characterized in that said twin-stage compound parabolic mirror is made of the twin-stage rotary body compound parabolic mirror solar concentrator of three-dimensional focal said compound parabolic and Fresnel reflection line segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98101632A CN1060857C (en) | 1998-04-24 | 1998-04-24 | Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98101632A CN1060857C (en) | 1998-04-24 | 1998-04-24 | Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1193747A CN1193747A (en) | 1998-09-23 |
| CN1060857C true CN1060857C (en) | 2001-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN98101632A Expired - Fee Related CN1060857C (en) | 1998-04-24 | 1998-04-24 | Condenser transiently connected by Fresnel reflecting mirror of double stage compound paraboloid mirror |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2927154A1 (en) * | 2007-03-05 | 2009-08-07 | R & D Ind Sarl | Solar energy collector, has convergent lens defining one of walls of casing, and mobile receptor held inside beams or in position intersecting beams by motor unit that controls movement of receptor with movement of beams |
| CN101697032B (en) * | 2009-09-23 | 2011-11-16 | 南京航空航天大学 | Compound paraboloid condenser |
| CN101968268B (en) * | 2010-09-30 | 2012-04-04 | 北京印刷学院 | Secondary reflection sphere lighting solar water heating and power generation device of closed optical-energy receiver |
| CN101957076B (en) * | 2010-10-25 | 2012-05-23 | 北京印刷学院 | Secondary-reflection spherical closed cavity lighting solar water heater |
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1998
- 1998-04-24 CN CN98101632A patent/CN1060857C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1193747A (en) | 1998-09-23 |
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