20130719 CDP Night LightningTalk "Internal Port Concentrator"
Prof. A. Steinfeld - SFERA - Solar Facilities for the...
Transcript of Prof. A. Steinfeld - SFERA - Solar Facilities for the...
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Prof. A. Steinfeld
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Prof. A. Steinfeld
OPTICS OF SOLAR CONCENTRATORS
Dr. Akiba Segal
Weizmann Institute of Science; Solar Research Facilities
Head of Solar Optics Design and Mathematical Modeling Unit
E-mail: [email protected]
Lecture at the First SFERA Summer School
PROMES-CNRS Laboratory, Font Romeu – Odeillo, France,
10-12 June 2010
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Prof. A. Steinfeld
►Not uniformly distributed on Earth: sunny South
vs. industrial North
►Cannot be stored and transported unless
converted into another form
►Form available today: electricity (but electricity
cannot be stored easily)
►Intermittent. Storage necessary: conversion into
chemical energy could be a solution
►Low concentration:MUST BE CONCENTRATED !
Characteristics of Solar Energy
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Prof. A. Steinfeld
Solar Concentrating Technologies
• Trough systems
• Tower systems
• Dish systems
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Prof. A. Steinfeld
Solar Radiation
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Prof. A. Steinfeld Why Concentrated Solar Power?
a, e
qsolar
qreradiation
T
quseful
C Tstagnation
1 364 K
10 648 K
100 1152
1000 2049 K
5000 3064 K
10000 3644 K
For:
I = 1 kW/m2 (1 sun)
= 5.67.10-8 W/m2K4
useful
For q 0
1a e
solar
q C I
0.25
stagnation
C IT
Thermal equilibrium:
a e
useful absorbed reradiation
4solar
q q q
q T
8 2 4
Stefan-Boltzmann constant
5.67051x10 W /(m K )
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Prof. A. Steinfeld Why Concentrated Solar Power?
0
500
1000
1500
2000
2500
3000
3500
4000
0 2000 4000 6000 8000 1 104
1.2 104
Tem
pera
ture
[K
]
Concentration Ratio
C Tstagnation
1 364 K
10 648 K
100 1152
1000 2049 K
5000 3064 K
10000 3644 K
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Prof. A. Steinfeld Maximum Thermodynamic Concentration
R
qsun
qorbit
SUND
8-1
11
R = 6.9599 10 m = sin R/D = 16' = 4.65 mrad
D = 1.505 10 m
C2D-max = 1/sinθ
C3D-max = 1/sin2θ
C3D-max = n2/sin2θ
a‟
2-Dqs= 2πRσ Ts
4 = σ Ts4 (2πR) / (2πD) a
q = σ T4a‟ ; T≤Ts ; qs = q → a‟ = a R/D → a‟ = asinθ
C2D-max = a/a‟=1/ sinθ
3-Dqs= 4πR2σ Ts
4 qA = σ Ts4 (4πR2) / (4πD2) A= σ T4 A‟
A/A‟=D2/R2=1/sin2θ; C3D-max=1/sin2θ
a
A‟
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Prof. A. Steinfeld
• Line focusing.
• C = 30 - 80.
• Unit 30 - 80 MW.
• Unidirectional
trough curvature.
• 1-axis tracking E-W.
Parabolic Trough System
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Prof. A. Steinfeld
Parabolic Trough technology bases its operation on
solar tracking and the concentration of solar rays on
receiving tubes with high thermal efficiency, located on
the focal line of the cylinder.
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Prof. A. Steinfeld
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Prof. A. Steinfeld
Heliostat Field
Tower
Receiver
• Point focusing.
• C = 200 - 1000.
• Unit 30 - 200 MW.
• 2-axis tracking heliostats:elements of different parabolas with
varying focal length.
Solar Tower System
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Prof. A. Steinfeld
Central Solar Plants: PS10, PS20
(Sanlúcar la Mayor, SPAIN)
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Prof. A. Steinfeld
• Point focusing.
• C = 1000 - 12,000.
• Unit 7.5 - 100 kW.
• 2-axis tracking parabolic dish.
• Modularity.
• Remote applications.
Solar Dish System
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Prof. A. Steinfeld
fD
High-Flux
PROMES Solar Furnace
@ Odellio
F
Solar Furnace
= =
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Prof. A. Steinfeld
In thermal equilibrium:
quseful = qabsorbed - qreradiation
quseful = aqsolar - eT4
Quseful = aQsolar - eAT4
a, e
qsolar
qreradiation
T
quseful
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Prof. A. Steinfeld
Qsolar
Solar Receiver
habsorption =[ ]
{
Solar Power Input
[ ] - [ ]
{Power absorbed {Power re-radiated
Qsolar
a Qsolar e A T4
a = e = 1
C =Qsolar
A.I
}
Qreradiation
C
Concentrated
Solar EnergyTI
h h h
4L
exergy,ideal absorption Carnot
TT1 1
C I T
h
4
absorption
T1
C I
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Prof. A. Steinfeld
For:
I = 1 kW/m2 (1 sun)
= 5.67.10-8 W/m2K4
C Tstagnation
1000 2049 K
5000 3064 K
10000 3644 K
Toptimal
1106 K
1507 K
1724 K
Carnot
1000
5,000
10,000
20,000
40,000
Fletcher and Moen, Science 197, 1050, 1977.
Toptimal
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Temperature [K]
0 500 1000 1500 2000 2500 3000 3500 4000
hexergy,ideal
h
5 4exergy L
optimal L optimal
T IC0 T 0.75T T 0
T 4
h
0.25
exergy stagnation
C I0 T
h h h
4L
exergy,ideal absorption Carnot
TT1 1
C I T
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Prof. A. Steinfeld
OPTICAL CONCENTRATOR
SOLAR
RECEIVER
Electricity
HEAT
ENGINE
Heat
Concentrated
Solar Radiation
Direct Solar Radiation
Rejected heat
Receiver losses
Concentration
losses
h h h h
h habsorption Carnot
solar to electrcity optics receiver heat to electricity
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Prof. A. Steinfeld
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Prof. A. Steinfeld
Imaging Optical Concentrators:
- Lens
- Parabolical / Spherical mirrors
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Prof. A. Steinfeld
C3D=(a/fθ)2
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Prof. A. Steinfeld
f
Фrim
θs = 16’ = 4.65 mrad
f.
ab
2.f.
(1+cosFrim)cosFrim
a =
2.f.
(1+cosFrim)b =
Flux
f.r
a
C =sin2(2Frim)/(4sin2s)s = 4.65 mrad
Frim = /4} C 11,500
Dish concentration:
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Prof. A. Steinfeld
Nonimaging Optical Concentrators:
Compound Parabolic / Elliptic
Concentrators (CPC / CEC)
Invented by Hinterberger & Winston
probably simultaneously with Baranov
(1965 published 1966)
References:
H. Hinterberger and R. Winston, Rev. Sci. Instrum. 37, 1094 (1966).
V. K. Baranov, Geliotekhnika 2, 11 (1966).
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Prof. A. Steinfeld
Edge ray principle
S
A
FS1
A1
S’
A’
L
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Prof. A. Steinfeld
Compound Parabolic Concentrator (CPC)
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Prof. A. Steinfeld
3D - CPC2D - CPC
CPC – Compound Parabolic Concentrator
Ref.: Winston R., Minano J. C., Benitez P (2005).
NONIMAGING OPTICS
E;lsevier Academic Press, Amsterdam, Boston,…
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Prof. A. Steinfeld
θ
a
a’
L=(a+a’)/tanθ
For =1:
Axis of
Parabola
C2D-CPC = a/a’= 1/sinθC3D-CPC =(a/a’)2 =1/sin2 θ
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Prof. A. Steinfeld
The CPC equations
θ
a
a’
L = (a+a’)/tanθ
r
z
a’ = a sinθ
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Prof. A. Steinfeld
2D-CPC
3D-CPC
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Prof. A. Steinfeldθ= 45°
a’= 1cm
a = a’/sinθ = 1.414cm
L = (a+a’) /tan θ = 3.414m
C = (a/a’)2 = 2
0.0
0.5
1.0
1.5
2.0
2.5
0 0.5 1 1.5 2 2.5
r [cm]
z [cm]
Example:
45°
a’
a
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Prof. A. Steinfeld
C3D,ideal= 33
C3D,ideal= 15
C3D,ideal= 8.5
C3D,ideal= 5.6
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Prof. A. Steinfeld
PP‟= 2a; QQ‟=2a‟
a’ = a sinθ/ sinθo L= (a + a’)/tanθ
CPC with exit angle less than /2
aa‟
CPC for θ= 20o, θo=70o, a’=0.2m
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Prof. A. Steinfeld
P0P0‟ arc of circle with center Q
A‟P0‟ parabola focus Q axis AQP0‟
Optimum concentrator for an edge-on fin: QQ‟
Optimum concentrator for transverse fin: QQ‟
Optimum concentrator for a cylindrical absorber
OP‟ arc of circle with center Q‟
P‟R‟ parabola focus Q‟ axis AQ‟P‟
R‟A‟ parabola focus Q axis ||AQ‟P‟
See next slide
Some particular types of 2D-Concentrators
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Prof. A. Steinfeld
XB the circle involute
BD the macrofocal parabola
Ideal 2D-concentrator with cylindrical absorber
„Classical‟ trough with cylindrical absorber
(including shading): C=1/π (C2D-ideal – 1)
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Prof. A. Steinfeld
Design of a circle involute
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Prof. A. Steinfeld
Macrofocal Parabola (MFP)
Parabola definition
FP+PQ=const & PQv1
MFP definition
AP+PQ=const & PQv2
A MFP reflects parallel rays to
became tangent to a circular MF
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Prof. A. Steinfeld
θ
r = 1 cm
θ = 45°
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
-5 -4 -3 -2 -1 0 1 2 3 4 5
x
y
Receiver
y
x
Example of 2D-CPC + involute:
r
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Prof. A. Steinfeld
x r[sin M() cos ]
y r[ cos M()sin ]
M( )
for 0
2 a
/ 2 a cos a
1 sin( a for
2 a
3
2 a
Equations of the 2-D CPC + involute
a CPC‘s half acceptance angle and is taken equal to the rim angle of
the primary parabolic concentrator.
r radius tubular receiver.
Tubular-Receiver
r
a
x
y
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Prof. A. Steinfeld
Nonimaging optical
concentrators with dielectrics
n >1
![Page 41: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/41.jpg)
Prof. A. Steinfeld
Refractive CPC
n1
n2
1
22,max
n
θ
F
F
1 1 2 2
-11,max 2,max 1 2
2D-CPC
23D-CPC
n sin = n sin
= 90° = sin (n /n )
C = n/sin
C = n /sin
n1sinθ1=n2sin θ2
θ1,max=/2θ2,max =arcsin(n1/n2)
C2D-CPC=n/sinθC3D-CPC=n2/sin2θ
![Page 42: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/42.jpg)
Prof. A. Steinfeld
Ref: Ning X.,O’Gallagher J.J.,Winston R,.Appl.Opt.,26, 300, (1987)
![Page 43: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/43.jpg)
Prof. A. Steinfeld
A dielectric-filled compound parabolic concentrator
Two stage ending in a dielectric of index n: first stage CPC mirror,
second stage: dielectric with total internal reflection
![Page 44: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/44.jpg)
Prof. A. Steinfeld
Two stage concentrator (built 1998).
Power absorbed in receiver 96kW;
concentration 10,000 suns
Reference: Ries H., Segal A., Karni J., Appl.Opt.,36,2829, (1997)
![Page 45: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/45.jpg)
Prof. A. Steinfeld
Cone concentrator
Transmission-angle curve for a cone with θmax = 10o
![Page 46: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/46.jpg)
Prof. A. Steinfeld
Compound Elliptic Concentrators
(CEC)
![Page 47: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/47.jpg)
Prof. A. Steinfeld
= 16’ = 4.65 mrad
f
θ
Two stage concentrator: stage 1 – dish,
stage 2 – CPC concentrator - (but…it is not the best solution !)
![Page 48: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/48.jpg)
Prof. A. Steinfeld
Concentrator suitable for a source AA‟ at a finite distance;
design of a new profile is based on edge ray principle
![Page 49: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/49.jpg)
Prof. A. Steinfeld
Compound Elliptic Concentrator (CEC)
concentrator for dishes
C= cos2Φrim / sin2θ
C=Cmax cos2Φrim
Φrim = <P1FO>
OΦrim
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Prof. A. Steinfeld
Compound Elliptic Concentrator(CEC)
concentrator for dishes
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Prof. A. Steinfeld
Using the optical concentrators
in the central solar plants
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Prof. A. Steinfeld
When is useful the receiver
concentrator (RC) in tower-top optics ?
800 1000 1200 1400 1600 1800
2500
3000
3500
4000
4500
5000
5500
Po
we
r a
bs
orb
ed
in
re
ce
ive
r (k
W)
Receiver working temperature (oC)
optimized receiver aperture without RC
receiver with optimized RC
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Prof. A. Steinfeld
Identification of best available correlation between the
CPC(s) adapted at receiver(s) used for central solar
plants and the field of heliostats
Rabl A., Solar Energy, 18, p.99,1976
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Prof. A. Steinfeld New concepts in designing the future central
solar plants when secondary concentrators are
providedSchmitz et.al.,
Solar Energy,80,p.111,2006
Segal and Epstein, Solar Energy, 65,p.206,1999
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Prof. A. Steinfeld
CPC approximated by truncated cones, truncated pyramids,
1-D curved facets
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Prof. A. Steinfeld
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
a
a
The optimum division: those points on the CPC profile satisfied the
condition that difference between consecutive slopes remains
constant.
Identification of best available
approximation of the mathematical profile of
CPC in truncated cones or pyramids
![Page 57: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/57.jpg)
Prof. A. Steinfeld
A new optical concept prevails
over the design of the solar
plants with central receiver:
the Beam-Down Optics
![Page 58: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/58.jpg)
Prof. A. Steinfeld
Cassegrain optics (17th century !!)
Cassegrain telescope (about 1850 !!)
BEAM-DOWN OPTICS
![Page 59: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/59.jpg)
Prof. A. Steinfeld
Secondary
concentrators
Second focal point
Aim-point First focal point
Heliostat fieldHeliostat field
Hyperboloidal mirror
Receiver
F1
F2
H
Principle of the Beam-Down Optics
![Page 60: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/60.jpg)
Prof. A. Steinfeld
Receiver
Tower Reflector
CPCCompound
Parabolic
Concentrator
Heliostat Field
Tower
• Heliostat field + Tower
Reflector (Cassegrainian).
• Beam-down on CPC.
• C = 5,000 - 10,000.
• Major hardware on ground
level.
![Page 61: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/61.jpg)
Prof. A. Steinfeld
(a)
cpc
Aim point
(b)
cpc
Aim point
Tower reflector optics two options are
available: hyperboloid and ellipsoid
![Page 62: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/62.jpg)
Prof. A. Steinfeld
0.0
0.4
0.8
1.2
AP
(a)
0.0
0.4
0.8
1.2(b)
AP
Smaller tower mirror, high flux on mirror,
larger image on the ground focal plane
Larger tower mirror, lower flux on mirror,
Smaller image on the ground focal plane
![Page 63: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/63.jpg)
Prof. A. Steinfeld
0.0
0.4
0.8
1.2
(c)
0.0
0.4
0.8
1.2
(d)
1000 2000 3000 4000 5000 6000
0
2000
4000
6000
8000
10000
12000
Hyperboloid mirrorEllipsoid mirror
Field of 66,240 m
2
reflective area.
Power collected by CPC 34.5 MW
Upper m
irror a
rea (
m2)
Concentration at the receiver entrance ( kW/m2)
Comparison hyperboloid ellipsoid:
= at the same concentration at the
receiver entrance, the ellipsoid area
is greater than the hyperboloid
area;
= at same area the hyperboloid
gives a higher concentration
Ref.: A.Segal and M.Epstein - “The Optics of the Solar Tower
Reflector” – Solar Energy 69 (Suppl.), pp. 229-241, 2000
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Prof. A. Steinfeld
0.5 0.6 0.7 0.8 0.9
5
10
15
20
AP - aimpoint ; LF - lower focus
HH - hyperboloid apex position
fh = ( HH - LF ) / ( AP - FI )
LF
HH
AP
fh
R, r (m
)
Collector radius, R (m)
Exit radius from concentrator, r (m)
10
20
30
40
50
60
(a)
*
Ac
ce
pta
nc
e a
ng
le
(
)
Acceptance angle,
Collector radius and acceptance angle
at various positions of the reflector (fh)
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Prof. A. Steinfeld
C - Central
receiver
P1-P6
Peripherals
C
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Prof. A. Steinfeld
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
0
500
1000
1500
Collector radius (entrance CPCs) (m)
Flu
x a
t R
C e
ntra
nc
e (k
W/m
2
)
Flux at CPCs entrance plane
0
2
4
6
peripheralscentral CPC radius
Po
we
r c
olle
cte
d (M
W)
Power collected
Flux and power vs. collector radius
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Prof. A. Steinfeld
Ray tracing at the entrance plane of
the ground concentrators
![Page 68: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/68.jpg)
Prof. A. Steinfeld
The World‟s biggest concentrator:
decagonal section; 10 segments;
H=5m,D=2.2m, d=0.45m, θ=11˚
![Page 69: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/69.jpg)
Prof. A. Steinfeld
WIS central concentrator with designed
peripheral concentrators
![Page 70: Prof. A. Steinfeld - SFERA - Solar Facilities for the …sfera.sollab.eu/.../Optics_of_Solar_Concentrators_Segal.pdfProf. A. Steinfeld Concentrator suitable for a source AA‟ at a](https://reader030.fdocument.pub/reader030/viewer/2022011801/5adcfe777f8b9a213e8c4baa/html5/thumbnails/70.jpg)
Prof. A. Steinfeld Application: Optical design for a
central solar plant for 10MW
Restrictions: the receiver(s) is/are provided with
window(s) having max. diameter 0.45m.
A cluster of 7 concentrators (accept.angle 30deg.) will
have an equivalent diameter of 2.2m
-100 -50 0 50 100
0
50
100
150
200
250
300
350
400
450
500
Y A
xis
Title
X Axis Title
-100 -50 0 50 100
0
50
100
150
200
250
300
350
400
450
500
Y Ax
is Ti
tle
X Axis Title
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Prof. A. Steinfeld
Stages in the field design
-100 -50 0 50 100
0
20
40
60
80
100
120
140
160
180
200
220
30o
-100 -50 0 50 100
0
100
200
300
400
500
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Prof. A. Steinfeld
-200 -150 -100 -50 0 50 100 150 200
0
50
100
150
200
North field
286 heliostats 25m2
East field
273 heliostats
West field
273 heliostats
Field 832 heliostats x 25m2 each
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Prof. A. Steinfeld
Existing software at W.I.S (1)
Design of CPC : CPCdesign.for
Input: -exit radius; acceptance angle; exit angle.
Output: -numerical CPC profile
Options for output:
- CPC truncation:
= given maximum entrance radius is calculated the
corresponding length or
= given maximum length is calculated the entrance
radius
- CPC approximated by „n‟ segments; options:
= equal segments
= non-equal segments;
= truncated height
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Prof. A. Steinfeld
exit radius(m) acceptance angle(grd) exit angle(grd) steps
0.20 20. 70. 10000
cpc dimensions:
acceptance angle (deg): 20.0
maximum exit angle (deg): 70.0
exit radius/diameter (m): 0.200 0.400
conic radius/diameter (m): 0.282 0.564
length of conic part (m): 0.175
CPC entrance radius/diam (m): 0.549 1.098
concentrator length (m): 2.059
CPC area (m2): 6.022
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Prof. A. Steinfeld
interpolations for truncated CPC :
- given radius calculate height - enter: 1 "radius (m)"
- given height calculate radius - enter: 2 "height (m)"
- for nonequal partitions - enter: 3 "number_of_partitions"
- for equal partitions - enter: 4 "number_of_partitions"
- to finish - enter: 0 0
1 0.55
radius greater than maximum possible: 0.549530
1 0.50
r= 0.500000 z= 1.068932
CPC dimensions (truncated):
truncated CPC entrance radius/diam (m): 0.5000 1.0000
truncated concentrator length (m): 1.0690
CPC area (m2): 2.6933
CPC entrance radius/diam (m): 0.549 1.098
concentrator length (m): 2.059
CPC area (m2): 6.022
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Prof. A. Steinfeld
2 1.07
z= 1.069000 r= 0.500008
cpc dimensions (truncated):
truncated CPC entrance radius/diam (m): 0.5000 1.0000
truncated concentrator length (m): 1.0693
CPC area (m2): 2.6942
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Prof. A. Steinfeld
3 4
Lmax
1.069
partition in 4 non-equal segments;Lmax= 1.0690
r z Δz grd. Δgrd.0.2000 0.0000
segm.1 0.2818 0.1754 0.1754 25.0
segm.2 0.3505 0.3475 0.1721 18.9 6.1
segm.3 0.4249 0.6146 0.2671 12.8 6.1
segm.5 0.5000 1.0693 0.4547 6.7 6.1
CPC dimensions (truncated):
truncated concentrator length(m): 1.0690
truncated CPC area (m2): 2.6933
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Prof. A. Steinfeld
4 4
Lmax
1.069
partition in 4 equal segments Lmax=1.069;
r z Δz0.2000 0.0000
segm.1 0.2828 0.1754 0.1754
segm.2 0.3893 0.4732 0.2978
segm.3 0.4565 0.7711 0.2979
segm.4 0.5000 1.0690 0.2979
CPC dimensions (truncated):
truncated concentrator length(m): 1.0690
truncated CPC area (m2): 2.6933
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Prof. A. Steinfeld
Existing software at W.I.S (2)
Transmission by CPC : ASsfera.for
Input is the output from CPCdesign.for
Options:
no=1; Only a circular aperture of given diameter;
no=2; CPC mathematical perfect;
no=3; CPC approximated by n cone segments;
no=4; CPC approximated by n pyramid segments;
having cross section regular polygons with m
sides;
no=5; CPC approximated as at previous point + CPC
peripherals (possible combinations m=3,p=6;
m=6, p=6; m=10, p=5)
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Prof. A. Steinfeld
-80 -60 -40 -20 0 20 40 60 80
0
20
40
60
80
100
120
140
160
Y A
xis
Title
X Axis Title
450
-80 -60 -40 -20 0 20 40 60 80
0
20
40
60
80
100
120
140
160
So
uth
- N
ort
h (
m)
West - East (m)
x xx
x
x x xx
x
xx x x x
x
xx
xx x
xx
x x x x xx
x
x x x x
Part of the WIS field (37H)
seen by a CPC having θ=20˚
d=0.4m; at H= 44.8m, tilted
δ=-37˚ (used only 33H)
Heliostat field at WIS
64 heliostats 54m2
reflective surface
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Prof. A. Steinfeld
INPUT:
file: „trasol.ray‟ (produced by TRASOL.FOR
with input from 33 heliostats from WIS field)
file:„geom.dat’: (produced by CPCdesign.FOR
CPC: r=0.2m, θ=20o, θo=20o truncated 1.8m)
.54673 6
.50675 .67078 h1+..+h6=1.8000
.44965 .39616 ..
.39072 .25563 ..
.33442 .17589 ..
.28177 .12699 h1+h2=0.3023
.20000 .17535 h.conical segm
3.00000
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Prof. A. Steinfeld
OUTPUT:
field with 33 heliostats
having the tracing errors 0.50 + 0.50 mrad
and the surface errors 1.10mrad
insolation 800. W/m2
run for the day 21 March hour 12.00
average cos(f) 0.9643
average shadowing(%) 0.00
average blocking (%) 1.26
Concentrator dimensions
CPC with the circular cross section
radius at the CPC entrance 0.5467m
radius at the CPC exit 0.2000m
total concentrator height 1.8000m
the concentrator axis is tilted -33.deg with the horizontal
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Prof. A. Steinfeld
power balance
number of rays analyzed: 1281.5
hit tower before target 0.0
spillage 821.2
rays enter concentrator: 460.3
rejected in concentrator: 31.9
absorbed in concentrator: 76.5
rays transmitted: 351.9
problematic rays: 0.1
average number of reflect: 1.22
average flux in receiver : 2800. kW/m2
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Prof. A. Steinfeld
C=7.56=sinθo/sinθ
C=7.5
C=7.3
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Prof. A. Steinfeld
RESULTS
d(m) / θ / θo D(m) L(m) Spillage
(kW)
Enter
CPC(kW)
Losses
(kW)
Enter
rec.(kW)
CPC perfect 0.4/20o/70o 1.10 2.06 815 477 121 356
Perfect,TRUNCATED 0.4/20o/70o 1.09 1.80 821 460 115 345
CPC 6cones; NEq 0.4/20o/70o 1.09 1.80 821 460 108 352
CPC 6cones; Eq 0.4/20o/70o 1.09 1.80 821 460 112 349
CPC 6trunc.pyr;NEq 0.4/20o/70o 1.09 1.80 825 457 119 337
CPC18trunc.pyr;NEq 0.4/20o/70o 1.09 1.80 825 457 115 342
Perfect, TRUNCATED 0.4/20o/70o 1.08 1.60 831 450 111 339
CPC 6cones; NEq 0.4/20o/70o 1.08 1.60 831 450 112 338
CPC 6cones; Eq 0.4/20o/70o 1.08 1.60 831 450 115 335
CPC 18cones; NEq 0.4/20o/70o 1.08 1.60 831 450 111 339
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Prof. A. Steinfeld
Field design for 1108 heliostats 100m2 each ;
tower reflector 3180m2; power in CPCs 63.5MW;
power in central CPC 26.8MW
ax
ish
yp
erb
olo
id
Aim point
Asymmetric field:
hyperboloid axis is tilted
LARGE FIELD 90MWthermal
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Prof. A. Steinfeld
CPC height
(m)
Entrance
radius of
single CPC
unit
(m)
7 CPCs
cluster
area (m2)
Spillage
around
entrance
(MW)
Total
power
entered
the CPC
cluster
(MW)
Net power
absorbed
(MW)
(after losses)
% from
line 1
19.7
CPC height
untruncated
5.34 3160 2.7 63.5 51.3 100.
14.1 5.20 2250 2.9 62.7 51.0 99.4
12.6 5.10 1990 3.2 62.4 50.7 98.9
10.5 4.90 1620 3.8 61.8 50.2 97.8
8.90 4.70 1350 4.6 61.0 49.5 96.5
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Prof. A. Steinfeld
4 6 8 10 12 14 16 18
400
600
800
1000
1200
1400
1600
1800
2000
CPC height (m)
7 C
PC
s
clu
ste
r a
rea
(m
2)
26.5MW26.4MW26.0MW
25.3MW
24.6MW
fh = 0.84
16.5m
untruncated
80
85
90
95
100
% fro
m m
ax
imu
m n
et p
ow
er
Net power into receiver with truncated CPC
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Prof. A. Steinfeld
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Prof. A. Steinfeld
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Prof. A. Steinfeld
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Prof. A. Steinfeld
H = 1.7m; Din= 64cm; Dout = 15cm; Θ = 12°
The 30 KW Reformer CPC
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Prof. A. Steinfeld
The 500 KW Reformer CPC
H = 1.05m; Din= 1.17m; Dout = 0.58m; Θ = 20°12 Facets; 4 Rows
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Prof. A. Steinfeld
Principal references:1. Rabl A., “Active Solar Collectors and Their
Application”, Oxford U. Press, New York, 1985
2. Welford W.T., Winston R., “High Collection Nonimaging
Optics”, Academic Press, San Diego, 1989
3. Winston R., Miňano J.C., Benitez P. et all,
“Nonimaging Optics”, Elsevier Academic Press,
Amsterdam, 2005
4. Chaves J., “Introduction to Nonimging Optics”, CRC
Press, Boca Raton, 2008
5. O‟Gallager J.J., “Nonimaging Optics in Solar Energy”,
Morgan&Claypool Publishers, Chicago, 2008
and more than one hundred papers published since 1976
until now
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Prof. A. Steinfeld
Finally, we reached the
END !!
Thank you for your attention !