CN101118296B - Solar light gathering baffle-board - Google Patents

Solar light gathering baffle-board Download PDF

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Publication number
CN101118296B
CN101118296B CN200710131202XA CN200710131202A CN101118296B CN 101118296 B CN101118296 B CN 101118296B CN 200710131202X A CN200710131202X A CN 200710131202XA CN 200710131202 A CN200710131202 A CN 200710131202A CN 101118296 B CN101118296 B CN 101118296B
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curve
para
angle
transversal
axle
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CN101118296A (en
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黄永年
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Jiangsu New Qicai Energy Saving Co ltd
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黄鑫
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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 present invention discloses a solar concentration and reflection board in the field of solar thermal collecting devices. The shape of the reflection surface of the concentration and reflection board is a space curved surface, the transversal of the space curved surface is the symmetrical curve whose symmetrical axis is the perpendicular of the polar axis passing the polar point in the plane polar coordinate, the transversal at one side of the symmetrical axis is composed of more than three parabolas connected with each other in sequence, and each parabola corresponds to an optimum solar reflection value in a period of time. The unity thereof can achieve the best concentration effect and enhance the thermal efficiency; the present invention can be used as the concentration and reflection board for various nontracking solar thermal collecting devices, the concentration and reflection board in collector tubes, and the concentration and reflection board for nontracking solar ovens and so on.

Description

Solar light gathering baffle-board
Technical field
The present invention relates to solar energy utilization technique.
Background technology
Utilize light gathering baffle-board with more large-area sunlight reflected to heat collection device, to strengthen Heat-collecting effect, improve the temperature of medium in the heat collection device, the existing many people of this problem obtain achievement in research, the employing V-arrangement reflector that has, the employing transversal that has is the barrel-shaped reflector of circular arc, and adopting transversal in addition is the curved reflector that the circular arc of different curvature radius is formed by connecting, and the employing transversal that also has is reflector of the involute urve of circle or the like.
As non-tracking mode light gathering baffle-board in the middle of one day since the solar angle degree change greatly, the sunlight that can not reflex on the heat collection device is still many, still can not reach satisfied spotlight effect, allow a part of high light run away often and some weak light have been captured.
Summary of the invention
The objective of the invention is to design a kind of solar light gathering baffle-board, make it to greatest extent the light that arrives reflecting plate be reflexed to the heat collection device surface.
The object of the present invention is achieved like this: solar light gathering baffle-board, the reflector shape of described light gathering baffle-board is a space curved surface, the transversal of this space curved surface is that the vertical line with the pole axis of crossing limit is the symmetrical curve of axis of symmetry in the polar coordinate system in the plane, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections 0, L 1, L 2L iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L iEstablish an equation under satisfying:
Figure GSB00000618515500011
Wherein, i=0,1,2,3,4,5......;
ρ is that the some distance to the extreme on the para-curve is utmost point footpath;
P iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;
θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;
The deflection angle of parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;
L 1With L 0Intersection point A 1(ρ 1, θ 1)
L 2With L 1Intersection point A 2(ρ 2, θ 2)
L iWith L I-1Intersection point A i(ρ i, θ i)
Para-curve L 0The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L 0Not rotation, rotation angle
Figure GSB00000618515500022
Be 0;
Para-curve L 1The relative L of axle 0The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is
Figure GSB00000618515500023
Claim deflection angle to be
Figure GSB00000618515500024
θ 1Corresponding Because the point of arrival (ρ 1, θ 1) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line with the between perpendiculars angle of the pole axis of crossing limit is
Figure GSB00000618515500026
In other words
Figure GSB00000618515500027
Determine by physical parameter; Deflection angle
Figure GSB00000618515500028
The rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit 0Axle;
Para-curve L 2Deflection angle is
Figure GSB00000618515500029
Para-curve L iDeflection angle is
Figure GSB000006185155000210
Adjacent parabolical burnt parameter P value establishes an equation under satisfying:
Figure GSB000006185155000211
Wherein: i=0,1,2,3
Figure GSB000006185155000212
Figure GSB000006185155000213
The present invention adopts plurality of sections para-curve to continue to form the reflective surface transversal of a light gathering baffle-board, with any solar incident ray that the parabolic bobbin parallels, all can converge to corresponding parabolic focus, because being arranged on limit place (also being each para-curve focus place) heat collecting element itself has certain volume, the angle of event and corresponding parabolic bobbin all can be reflexed on the heat collecting element by this parabolic segment reflective surface less than the solar incident ray of certain value, this light gathering baffle-board converges incident ray strong relatively in the back before midday certain hour scope to obtain the spotlight effect with respect to other shape optically focused reflective surface the best, each parabolic segment is because different at a distance of the distance of focus, so the time length and the zero-time of the sunshine after converging before midday in the certain hour scope are different, and the solar incident ray that is arrived on each parabolic segment reflective surface strong relatively that of its sunlight strength in whole period all reflection converge to the heat collecting element surface, its collecting efficiency is higher, the unnecessary tracking means that costliness is set.With space curved surface of the present invention as reflective caustic surface owing to be non-tracking, in fact also have in one day a certain amount of weak relatively sunray can not optically focused to heat collecting element, but has best spotlight effect in theory as the reflective caustic surface of Nontracking with space curved surface of the present invention, because any one section curved surface of space curved surface of the present invention in theory all can accomplish the solar incident ray that is arrived on this section reflective surface strong relatively that of its sunlight strength in whole period all reflection converge to the heat collecting element surface, and the reflective caustic surface reflection of other shape to converge its light of solar incident ray in a period of time of same length be not light in that a period of time the strongest in one day.The present invention can be used as light gathering baffle-board, the concentration inverse light panel in the thermal-collecting tube of various Nontracking solar heat collectors, light gathering baffle-board of Nontracking solar kitchen range etc.
Above-mentioned space curved surface can have following two kinds of structures, and one is, to be described transversal along the vertical direction on its plane, place stretch space curved surface forms.The focus of each transversal stretches in line, along this straight line solar energy heat collection pipe can be set, and makes the Nontracking solar heat collector.It two is, described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry of described transversal.Each transversal has a public focus (limit), can heat collecting element be set on focus, makes the Nontracking solar kitchen range.
Description of drawings
Fig. 1 is principle of the invention figure;
Fig. 2 is the transversal synoptic diagram of reflective surface;
Embodiment
Embodiment 1
As Fig. 1, be a kind of solar light gathering baffle-board, the reflective surface of described light gathering baffle-board is shaped as a space curved surface, and the transversal of this space curved surface is the symmetrical curve of axis of symmetry for the pole axis vertical line with mistake limit in the polar coordinate system in the plane, the para-curve L that three sections orders of the transversal of described axis of symmetry one side link to each other 0, L 1, L 2L iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L iEstablish an equation under satisfying:
Figure GSB00000618515500041
Wherein, i=0,1,2,3;
ρ is that the some distance to the extreme on the para-curve is utmost point footpath;
P iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;
θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;
The deflection angle of parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;
L 1With L 0Intersection point A 1(ρ 1, θ 1)
L 2With L 1Intersection point A 2(ρ 2, θ 2)
L 3With L 2Intersection point A 3(ρ 3, θ 3)
Para-curve L 0The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L 0Not rotation, rotation angle
Figure GSB00000618515500043
Be 0;
L 0Mathematic(al) representation:
ρ = P 0 [ 1 + Sinθ ] Cos 2 θ
For the light gathering baffle-board in qualification is installed on transparent Circular glass pipe, generally can be with para-curve L 0The chord length B of overfocus and the string vertical with the parabolic bobbin 1B 2As the breadth extreme of the incident ray family that wants to assemble, get B 1B 2=2P 0, P 0Also equal para-curve L 0The summit to two times of focal length; For the light gathering baffle-board of unqualified space condition, the breadth extreme of the incident ray family that wants to assemble can be greater than 2P 0
L 1Mathematic(al) representation:
Figure GSB00000618515500045
Para-curve L 1The relative L of axle 0The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is
Figure GSB00000618515500046
Claim deflection angle to be
Figure GSB00000618515500047
θ 1Corresponding
Figure GSB00000618515500051
Because the point of arrival (ρ 1, θ 1) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line with the between perpendiculars angle of the pole axis of crossing limit is
Figure GSB00000618515500052
In other words
Figure GSB00000618515500053
Determine by physical parameter; Deflection angle
Figure GSB00000618515500054
The rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit 0Axle;
Para-curve L 2Deflection angle is
Figure GSB00000618515500055
Para-curve L iDeflection angle is
Figure GSB00000618515500056
Adjacent parabolical burnt parameter P value establishes an equation under satisfying:
Wherein: i=0,1,2,3
Figure GSB00000618515500058
To be described transversal along the vertical direction on its plane, place stretch described space curved surface forms.
At para-curve L 0Last A 1Point is ∠ PA for the subtended angle of heat collector 1R=α, and arrive A 1The incident ray of point is distributed in the β angular region, and β＞α establishes A 1M is parallel to para-curve L 0Axle, heat collector can only receive and arrive A 1Point is established ∠ PA smaller or equal to the incident ray in the α angular region 1This is to arrive A among one day for Q=α 1Point is no more than the strongest light of angle α scope, A 1N is ∠ PA 1The angular bisector of Q, order
Figure GSB000006185155000510
Figure GSB000006185155000511
Arrive A in other words 1The average incident angle of light the strongest in the middle of one day that point may be received by heat collector is by being parallel to straight line A 1The incident ray representative of N.
If we will be through A 1A certain parabolical P value of point changes, focus still at O point and parabolical rotate The angle so just can make ∠ PA 1Incident ray in the Q scope reflexes to ∠ PA like clockwork 1The R scope.With the O point is the center rotation
Figure GSB000006185155000513
The new para-curve at angle is L 1Para-curve.
A on para-curve 1Point is each point left, and the average incident angle of the incident ray that is arrived all is to be parallel to para-curve L 0The axle incident ray be representative, so A 1Point is L left 0Para-curve is best, needn't rotate.
A on para-curve 1Point is crossed A to the right 2New para-curve of point still is the focus rotation with O
Figure GSB000006185155000514
The angle, its burnt parameter P changes into P 2, new para-curve is L 2, same reason also can guarantee to arrive A in one day 2The strongest light on the point and the heat collector that can be reflected to the certain space size that satisfies the requirements does not converge to the heat collector surface with not omitting in theory.
By that analogy, when transversal is made up of the para-curve more than three sections, the para-curve of corresponding some the bests of some spots.A 1Point is at L 1On the para-curve, A 2Point is at L 2On the para-curve, A iPoint is at L iOn the para-curve, if the enough big following new curve of i just can accurately assemble sunlight as much as possible to the heat collector until reaching best in theory convergent effect.
New curve is continued by following point and following para-curve and forms:
L 0-A 1(point)-L 1-A 2-L 2-A 3-...-A i-L i
If the i value is enough big, what the new curve of above-mentioned new curve and following expression just do not have respectively:
L 0-A 1(point)-A 2-A 3-A i
Like this, the transversal of this curved surface reflector can be made up of the plurality of sections parabolic segment, crossing the vertical line of initial point perpendicular to pole axis is that each section transversal line of Y-axis both sides is symmetrical, as shown in Figure 2, the all corresponding the strongest incident ray of a period of time of each section reflector, the combination of its integral body can obtain best spotlight effect.To be described transversal along the vertical direction on its plane, place stretch described space curved surface forms, the focus of each transversal of this curved surface reflector (being the parabolical public focus of each section) stretches in line, along this straight line solar energy heat collection pipe can be set, can be made into the Nontracking solar heat collector.
Embodiment 2
Another solar light gathering baffle-board, the reflective surface of described light gathering baffle-board is shaped as a space curved surface, the transversal of this space curved surface is the symmetrical curve of axis of symmetry for the pole axis vertical line with mistake limit in the polar coordinate system in the plane, described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry Y-axis of described transversal; The transversal shape still can be as shown in Figure 2, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections 0, L 1, L 2L iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L iEstablish an equation under satisfying:
Figure GSB00000618515500061
Wherein, i=0,1,2,3,4,5......;
ρ is that the some distance to the extreme on the para-curve is utmost point footpath;
P iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;
θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;
The deflection angle of parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;
L 1With L 0Intersection point A 1(ρ 1, θ 1)
L 2With L 1Intersection point A 2(ρ 2, θ 2)
L iWith L I-1Intersection point A i(ρ i, θ i)
Para-curve L 0The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L 0Not rotation, rotation angle
Figure GSB00000618515500072
Be 0;
Para-curve L 1The relative L of axle 0The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is
Figure GSB00000618515500073
Claim deflection angle to be
Figure GSB00000618515500074
θ 1Corresponding
Figure GSB00000618515500075
Because the point of arrival (ρ 1, θ 1) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line with the between perpendiculars angle of the pole axis of crossing limit is
Figure GSB00000618515500076
In other words
Figure GSB00000618515500077
Determine by physical parameter; Cross the vertical line para-curve L just of the pole axis of limit 0Axle;
Para-curve L 2Deflection angle is
Figure GSB00000618515500078
Para-curve L iDeflection angle is
Figure GSB00000618515500079
Adjacent parabolical burnt parameter P value establishes an equation under satisfying:
Figure GSB000006185155000710
Wherein: i=0,1,2,3
Figure GSB000006185155000711
Figure GSB000006185155000712
Each transversal parabolic segment has a public focus (limit), can heat collecting element be set on focus, makes the Nontracking solar kitchen range.

Claims (3)

1. solar light gathering baffle-board, it is characterized in that: the reflector shape of described light gathering baffle-board is a space curved surface, the transversal of this space curved surface is the symmetrical curve of axis of symmetry for the vertical line with the pole axis of mistake limit in the polar coordinate system in the plane, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections 0, L 1, L 2L iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L iEstablish an equation under satisfying:
Figure FSB00000618515400011
Wherein, i=0,1,2,3,4,5......;
ρ is that the some distance to the extreme on the para-curve is utmost point footpath;
P iBe parabolical burnt parameter, be corresponding para-curve L iThe summit to two times of focal length;
θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;
Figure FSB00000618515400012
Be para-curve L iThe axle deflection angle, refer to para-curve L iAxle be the angle that the center rotates in the counterclockwise direction with the limit;
L 1With L 0Intersection point A 1(ρ 1, θ 1)
L 2With L 1Intersection point A 2(ρ 2, θ 2)
L iWith L I-1Intersection point A i(ρ i, θ i)
Para-curve L 0The between perpendiculars angle of axle and the pole axis of polar coordinate system in the plane be 0, at this moment, para-curve L 0Not rotation, rotation angle
Figure FSB00000618515400013
Be 0;
Para-curve L 1The relative L of axle 0The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is Claim deflection angle to be
Figure FSB00000618515400015
θ 1Corresponding Point of arrival A 1(ρ 1, θ 1) the average incident angle of locating strong relatively incident ray is representative with following straight line, this straight line with the between perpendiculars angle of the pole axis of crossing limit is
Figure FSB00000618515400017
Deflection angle
Figure FSB00000618515400018
The rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit 0Axle;
Para-curve L 2Deflection angle is
Figure FSB00000618515400019
Para-curve L iDeflection angle is
Figure FSB000006185154000110
Adjacent parabolical burnt parameter P value establishes an equation under satisfying:
Figure FSB00000618515400021
Wherein: i=1,2,3
Figure FSB00000618515400022
Figure FSB00000618515400023
2. solar light gathering baffle-board according to claim 1 is characterized in that: to be described transversal along the vertical direction on its plane, place stretch described space curved surface forms.
3. solar light gathering baffle-board according to claim 1 is characterized in that: described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry of described transversal.
CN200710131202XA 2007-08-23 2007-08-23 Solar light gathering baffle-board Expired - Fee Related CN101118296B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101603738B (en) * 2009-07-01 2012-06-06 山东力诺瑞特新能源有限公司 Moderate-temperature solar heat collector
CN101887165B (en) * 2010-06-30 2012-04-25 徐国彬 Super paraboloid solar energy concentrator
CN101963323B (en) * 2010-08-30 2012-05-23 长春希达电子技术有限公司 Reflector and LED packaging structure using same
CN102401500B (en) * 2010-09-07 2014-10-15 江苏奥莱佳太阳能科技有限公司 All-glass heat tube solar vacuum tube
CN102401485B (en) * 2010-09-07 2015-02-04 黄永立 Metal spiral pipe solar heat collector
CA2776680A1 (en) * 2012-05-14 2013-11-14 James Thomas Beck Light weight solar concentrator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730240A (en) * 1981-12-09 1988-03-08 U.S. Philips Corporation Reflector
CN1456903A (en) * 2003-05-08 2003-11-19 陈锡良 Parabolic deformed reflector
CN2828668Y (en) * 2005-11-18 2006-10-18 邝建设 Domestic hanging solar water heater
CN2864496Y (en) * 2005-12-15 2007-01-31 北京市太阳能研究所有限公司 Compound parabolic deflector plate solar energy water heater
CN201096909Y (en) * 2007-08-23 2008-08-06 黄鑫 A solar focusing reflective board

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730240A (en) * 1981-12-09 1988-03-08 U.S. Philips Corporation Reflector
CN1456903A (en) * 2003-05-08 2003-11-19 陈锡良 Parabolic deformed reflector
CN2828668Y (en) * 2005-11-18 2006-10-18 邝建设 Domestic hanging solar water heater
CN2864496Y (en) * 2005-12-15 2007-01-31 北京市太阳能研究所有限公司 Compound parabolic deflector plate solar energy water heater
CN201096909Y (en) * 2007-08-23 2008-08-06 黄鑫 A solar focusing reflective board

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