abstract final id: control id: title: …oa.upm.es/20928/1/inve_mem_2012_131144.pdf · 2014. 9....
TRANSCRIPT
-
Print
Submitted
on August 23, 10:54 AM
for energy12
Proof
ABSTRACT FINAL ID: SM2A.3
CONTROL ID: 1464611
TITLE: Free form Optics Applications in Photovoltaic Concentration
Abstract (35 Word Limit): Freeform surfaces are the key of the state-of-the-art nonimaging optics to solvethe challenges in concentration photovoltaics. Different families (FK, XR, FRXI) will be presented, based on theSMS 3D design method and Köhler homogenization.
AUTHORS/INSTITUTIONS: J.C. Minano, , Universidad Politecnica de Madrid, Madrid, SPAIN;
KEYWORDS: General: 000.0000, General: 000.0000.
ScholarOne Abstracts® (patent #7,257,767 and #7,263,655). © ScholarOne, Inc., 2012. All Rights Reserved.
ScholarOne Abstracts and ScholarOne are registered trademarks of ScholarOne, Inc.
Follow ScholarOne on Twitter
Terms and Conditions of Use
Product version number 4.0.0 (Build 66)
Build date Oct 16, 2012 11:54:50. Server tss1be0013
javascript:window.print()javascript:window.close()http://www.scholarone.com/http://www.twitter.com/ScholarOneNewshttp://energy12.abstractcentral.com/terms.jsp
-
SOLAR Optics for Solar Energy 11th-14th November 2012, Eindhoven
1/13
Juan C. Miñano, Pablo Benítez, Pablo Zamora, João Mendes-Lopes, Marina Buljan, Asunción Santamaría
Universidad Politécnica de Madrid (UPM), Spain
LPI , Altadena, California, USA
Freeform Optics Applications in Photovoltaic Concentration
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 2/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 3/46
PV technologies
Triple-junction III-V cells (C >>1)
III-V cells are very expensive (~$50,000/m2-$150,000/m2)!!!!!
Silicon cells (C = 1)
43.5%
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 4/46
HCPV optical specs
1. Geometrical concentration: 500-1,500
2. Low cost of optics ( ±1deg)
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 5/46
θ (degs)
100
75
50
25
0.5 1 1.5
T(θ) (%)
α
90%
α
Geometrical and chromatic aberrations
Angle at which transmission drops to 90% of maximum
Ideal lens
Real lens
Acceptance angle definition
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 6/46
Tolerance budget has to be shared among:
1. Sun’s angular extension ±0.27° 2. Optical components manufacturing
(shape and roughness) 3. Module assembling 4. Array assembling,
series connection mismatch 5. Tracker structure stiffness 6. Tracking accuracy
Tolerance budget The acceptance angle is a common basis to measure the tolerance of a design
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 7/46
Some Fresnel-based CPV systems
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 8/46
Concentration Acceptance Product
• CAP =
• CAP ≈ constant for a given architecture
• CAP is an important merit function
sinC α×
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 9/46
Classic homogenization scheme
Prism homogenizer
CAP~0.45 CAP~0.18
Refractive Truncated Pyramid (RTP)
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 10/46
Classical mirror based designs
Cell
Parabolic mirror Cassegrian aplanat
CAP~0.49 CAP~0.42
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 11/46
Cassegrian aplanat Parabolic mirror
Some mirror-based CPV systems
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 12/46
Why freeforms in CPV?
• Freeforms provide more freedom to improve performance and functionality
• Nonimaging freeforms are not more expensive than symmetric surfaces
• Symmetric optics cannot solve satisfactorily some asymmetric CPV problems
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 13/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 14/46
Solar cell
Homogenizing prism
Free-form primary
mirror (X) Free-form secondary lens (R)
Side view
• Light blocking is avoided • Wide space for heat-sink
The freeform XR concentrator
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 15/46
The SMS3D design method
• SMS3D is an advanced optical design method
• SMS3D is capable to design two freeform surfaces without optimization
• SMS3D deals with extended sources and receivers
Benítez, P., Miñano, J. C., Blen, J., Mohedano, R., Chaves, J., Dross, O., Hernández, M., Falicoff, W, Opt. Eng. 43(7), 1489–1502, (2004)
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 16/46
XR SMS 3D design
A. Cvetkovic et al. Proc. SPIE Vol. 7043-12, 2008
SMS ribs construction
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 17/46
XR SMS 3D design
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 18/46
XR SMS 3D design procedure
Final freeforms
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 19/46
* The XR700 module developed by BOEING Co. and LPI
(A.Plesniak et all. 34th IEEE PV Specialist Conference, 2010)
The freeform XR concentrator
33.2%
Freeform mirror
Freeform lens
A. Cvetkovic, M. Hernández, P. Benítez, J. C. Miñano, J. Schwartz, A. Plesniak, R. Jones, D. Whelan, Proc. SPIE Vol. 7043-12, 2008
C = 1,000x α=±1.8º
Glass cover
CAP~1
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 20/46
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 21/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 22/46
The simplest Köhler CPV design
L. W. James, Contractor Report SAND89–7029, (1989)
Images the Fresnel lens on the cell!
2.834511.87419
0.913859-0.0464674
-1.00679-1.967120
0.0000050.00001
0.0000150.00002
0.0000250.00003
0.000035
0.00004
-2.8
3451
-2.2
4593
-1.6
5734
-1.0
6875
-0.4
8016
30.
1084
240.
6970
111.
2856
1.87
419
2.46
277SILO (SIngle Lens secondary Optics)
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 23/46
LPI’s Köhler array concentrators
S
S'
T
T’
O
I
I’
O’ Mi Mo
This can de done in 2D or 3D (free-form surfaces).
The optical process is done in parallel channels that homogenize and concentrate at the same time!
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 24/46
The Fresnel-Köhler (FK) concentrator
P. Benítez, J.C. Miñano, P. Zamora, R. Mohedano, A. Cvetkovic, M. Buljan, J. Chaves, M. Hernández, Optics Express, Vol. 18, Issue S1 (Energy Express), April 2010
Free-form lens
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 25/46
0.0 0.2 0.4 0.6 0.8 1.0
0.59
0.450.36
0.30
0.28
0.18
3
5
7No SOE
Spherical dome
SILO
XTP
RTP
Fresnel Kohler (FK)
No SOE
Spherical dome
SILO
XTP
RTP
Fresnel Kohler (FK)
singCAP C α= ×
25
Comparison
Fresnel-RTP
0 5 10 2015 25-10 -5-15-25 -20
5
10
15
25
20
35
30
40
45
50
(mm)
55
Spherical Dome
FK concentrator
Fresnel-XTP
SILO
Fresnel (no SOE)Since (0.59/0.45)2=1.7, the FK 1,000x is equivalent to an 580x RTP!
APOE=625cm2 α = ±1º
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 26/46
Freeform secondary lens Fresnel lens
The FK concentrator
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 27/46
FK acceptance angle
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
-1.6 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 1.6
Isc (A
)
Tracker angle (º)
Measured = ±1.24o Simulated = ±1.25o
C = 625x
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 28/46
FK irradiance uniformity
-5
5
0
100
200
300
400
500
600
-5
5
-5
5
0
100
200
300
400
500
600
-5
5
Measured Peak irradiance = 595 suns
Simulated Peak irradiance = 575 suns
Suns
Suns
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 29/46
The VentanaTM Optical Train • A complete off-the-shelf optics solution by Evonik and LPI • Based on the best-in-class design: The FK concentrator
POE = primary optical element SOE = secondary optical element
6x6 Fresnel lens parquet
http://corporate.evonik.com/en
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 30/46
0
0.5
1
1.5
2
2.5
3
0 0.5 1 1.5 2 2.5 3
Curr
ent
(A)
Voltage (V)
LPI-Evonik VentanaTM optical train
Pm
Efficiency = 32.8%* Fill Factor = 83.6% Pm = 6.97 W Isc = 2.80 A Voc = 2.95 V Irradiance = 847 W/m2 Entry Aperture = 256 m2
*No AR coatings; @Tcell=25ºC C3MJ Spectrolab cell bin 39%
C = 1,024x α > ±1º
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 31/46
• Daido Steel present CPV system:
• UPM and Daido Steel are developing a new Köhler technology, DFK, within the NGCPV project
*Over illuminated cell area
CAP = Cg x sin α
• Cg* = 950 • α = ±0.92º
CAP = 0.49
• Higher concentration without compromising acceptance angle is desired.
• LPI, in collaboration with UPM, has developed high-performance Köhler freeform concentrators.
DFK
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 32/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 33/46
DFK optics • Cg = 1,234 • α > ±1.1º • Module efficiency > 35%
Daedo Steel module
& system technology
LPI Köhler optical
technology
CAP > 0.67
CAP = Cg x sin α
DFK
http://www.daido.co.jp/en/products/cpv/technology.html
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 34/46
POE (4 sectors Fresnel lens)
Flat FK (FK) Dome-shaped FK (DFK)
DFK
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 35/46
17.3
13.8
5.5
5
Cg=1,234x f/ 0.81 SOE material: B270-equiv. glass POE material: PMMA
cell side
design area side
0.25mm wide frame around the cell for assembly tolerances
All dimensions in mm
DFK design parameters
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 36/46
Irradiance uniformity
0
200
400
600
800
1000
1200
1400
suns
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3
Effi
cie
ncy
Angle (deg)
Transmission curve
1.18 deg
90%
AM1.5D spectrum, finite sun, EQE’s of 3J cell, Fresnel and absorption losses included in simulation
CAP=0.72 > 0.67 (spec)
DFK simulation results
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 37/46
AR coating on SOE
Optical efficiency
Acceptance angle
NO 85.6% ±1.18º
YES 87.5% ±1.18º
AR coating
50
55
60
65
70
75
80
85
90
95
100
300 500 700 900 1100 1300 1500 1700
Tran
smis
sion
(%)
Wavelength (nm)
α=0degα=10degα=20degα=30degα=40degα=50degα=60degα=70deg
DFK: AR coating on SOE
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 38/46
ISSUE FLAT FK DOME-SHAPED FK
Acc. angle (α) 1 ±1.03 deg ±1.18 deg
CAP 0.63 0.72
Optical efficiency2 86.5% 87.5%
Irr. uniformity Excellent Very good
F-number 1.07 0.81
1 Cg = 1,234x for both concentrators 2 With AR coating, no rounding of facet corners
Performance comparison
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 39/46
SILO
XTP
RTP
esnel Kohler (FK)
SILO
XTP
RTP
esnel Kohler (FK)
FK
r
r
0.63
DFK 0.72
SILO
XTP RTP
FK DFK
0.28
0.32
0.44
Performance comparison
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 40/46
Practical problems with RTP secondaries
Köhler SOE Classical SOE
Lost ray
Every surface is optically active
Total Internal
Reflection (TIR)
Silicone optical coupler
sealant
Only these surfaces are
optically active
Fixing features
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 41/46
POE mold has a 9-part molding die
3 different demolding movements
Only central part (red) needs positive draft angles
Daedo Steel advanced demolding technique
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 42/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 43/46
Conclusions
• Freeform optics is a proven technology for higher performance CPV designs
• Highly asymmetric CPV problems can optimally solved with freeforms, as the SMS3D XR design
• Köhler array concentrators, as the FK, solve practical issues and outperform classical designs
• Further advanced freeform concepts in progress
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 44/46
LEGAL NOTICE
Devices shown in this presentation are protected by the following US and International Patents and Patents Pending:
Patents Issued
HIGH EFFICIENY NON-IMAGING US 6,639,733 October 28, 2003 COMPACT FOLDED-OPTICS ILLUMINATION LENS US 6,896,381 May 24, 2005 COMPACT FOLDED-OPTICS ILLUMINATION LENS US 7,152,985 December 26, 2006 COMPACT FOLDED-OPTICS ILLUMINATION LENS US 7,181,378 February 20, 2007 DEVICE FOR CONCENTRATING OR COLLIMATING RADIANT ENERGY US 7,160,522 January 9, 2007 DISPOSITIVO CON LENTE DISCONTINUA DE REFLEXIÓN TOTAL INTERNA Y DIÓPTRICO ESFÉRICO PARA CONCENTRACIÓN O COLIMACIÓN DE ENERGÍA RADIANTE Spain ES P9902661 December 2, 1999 OPTICAL MANIFOLD FOR LIGHT-EMITTING DIODES US 7,380,962 OPTICAL MANIFOLD FOR LIGHT-EMITTING DIODES US 7,286,296 THREE-DIMENSIONAL SIMULTANEOUS MULTIPLE-SURFACE METHOD AND FREE-FORM ILLUMINATION-OPTICS DESIGNED THEREFROM US 7,460,985 December 2, 2008
Partial List of Patents Pending
DEVICE FOR CONCENTRATING OR COLLIMATING RADIANT ENERGY - a continuation of US 7,160,522 FREE-FORM LENTICULAR OPTICAL ELEMENTS AND THEIR APPLICATION TO CONDENSERS AND HEADLAMPS PCT/US2006/029464 July 28, 2006 MULTI-JUNCTION SOLAR CELLS WITH A HOMOGENIZER SYSTEM AND COUPLED NON-IMAGING LIGHT CONCENTRATOR PCT/US07/63522 March 7, 2007 OPTICAL CONCENTRATOR, ESPECIALLY FOR SOLAR PHOTOVOLTAICS PCT/US08/03439 Mar 14, 2008
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 45/46
• This work is under the NGCPV EU-Japan project, funded by EU Commission (ENERGY,2011,2,1-1 Grant agreement no. 283798) and Japanese NEDO.
• Devices shown in this presentation are protected under US patent 8,000,018 & International patent applications 0905286.3, 200980154626.5, 762MUMNP2011
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 46/46
Thank you!
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 47/46
0.76
0.77
0.78
0.79
0.8
0.81
0.82
0.83
0.84
0.85
0.86
0.87
0.88
0 10 20 30 40 50
Opt
ical
Effic
ienc
y
Edge Radius (μm)
Only Rounded Outer Corners
Equally Rounded Inner and Outer Corners Outer
corners Inner corners
Outer corners
LENS
LENS
No rounded corners
ciency drop due to teeth rounded edges
83.4%
87.5%
30μm
87.0%
0.78
0.79
0.8
0.81
0.82
0.83
0.84
0.85
0.86
0.87
0.88
0.90
0.89
DFK round corners losses
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 48/46
DFK with dimple DFK without dimple
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 49/46
Top view Bottom view
Central dimple enhanced POE design
-
SOLAR Optics for Solar Energy, 11th-14th November 2012, Eindhoven 50/46
Index
1. Introduction
2. Free-forms in asymmetric systems
3. Freeform Köhler array concentrators
The VENTANA optical train
Daido Steel’s DFK
4. Conclusions
Número de diapositiva 1IndexNúmero de diapositiva 3HCPV optical specsNúmero de diapositiva 5Número de diapositiva 6Some Fresnel-based CPV systemsNúmero de diapositiva 8Número de diapositiva 9Classical mirror based designsSome mirror-based CPV systemsWhy freeforms in CPV?IndexThe freeform XR concentrator The SMS3D design methodNúmero de diapositiva 16Número de diapositiva 17XR SMS 3D design procedureThe freeform XR concentrator Número de diapositiva 20IndexThe simplest Köhler CPV designLPI’s Köhler array concentratorsThe Fresnel-Köhler (FK) concentratorNúmero de diapositiva 25Número de diapositiva 26Número de diapositiva 27Número de diapositiva 28The VentanaTM Optical TrainNúmero de diapositiva 30Número de diapositiva 31IndexNúmero de diapositiva 33Número de diapositiva 34Número de diapositiva 35Número de diapositiva 36Número de diapositiva 37Número de diapositiva 38Número de diapositiva 39Número de diapositiva 40Número de diapositiva 41IndexNúmero de diapositiva 43Número de diapositiva 44Número de diapositiva 45Número de diapositiva 46Número de diapositiva 47Número de diapositiva 48Número de diapositiva 49Index