INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 1
www.eurotrough.com
EuroTrough - Design Issues and Prototype Testing at PSA
Eckhard Lüpfert, Michael GeyerGerman Aerospace Center (DLR), PSA, Spain
Wolfgang SchielSchlaich Bergermann und Partner, Stuttgart, Germany
Antonio Esteban, Rafael OsunaINABENSA, Sevilla, Spain
Eduardo ZarzaCIEMAT-PSA, Almería, Spain
Paul NavaFLABEG Solar International, Köln, Germany
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 2
www.eurotrough.com
EuroTrough initial remarks
� Concentrating Parabolic Trough Collector for solar...
� electricity generation� desalination � process heat
� Outlet temperature 400°C (752°F)� Collector size 545 m2 - 817 m2
up to 650 kW thermal output per collector� Electricity price ranges 15 cts/kWh� Technology under commercial operation in
California (Mojave Desert, 354 MWel)
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 3
www.eurotrough.com
Schematic of a solar thermal power plant
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 4
www.eurotrough.com
Trough Collector Performance (Egypt)
0
200
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30 40 50 60 70 80 90 100
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Operating Temperature [°C]
Ann
ual T
herm
al O
utpu
t [kW
ht/m
²a]
Flatplate 30° inclined
Flatplate Collector 30°inclined with C=1.5 sidereflector concentration
Evacuated Tube Collector30° inclined
Evacuated Tube Collector30° inclined with 1.5 CPCconcentration
Parabolic Trough North-South
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 5
www.eurotrough.com
The EuroTrough Prototype
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 6
www.eurotrough.com
EuroTrough Project Start
in the nineties:
INABENSAInstalaciones Abengoa, S.A.
Schlaich Bergermannund Partner
The European Commission
� a vision� a group of
visionaries
CRES
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 7
www.eurotrough.com
EuroTrough Project Starting point
� an international platform
� a test loop on PSA� a reference
(California)
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 8
www.eurotrough.com
EuroTrough Characteristics
Layout parabolic trough collectorsupport structure steel frame work, pre-galvanized,
three variants; light weight, low torsioncollector length 12 m per element;
100 - 150 m collector lengthdrive hydraulic drivemax. wind speed operation: 14 m/s, stow: 40 m/sTracking control clock + sun sensor, <2 mradparabola y = x2/4f with f = 1.71 maperture width 5.8 mReflector 4 glass facetsoptical efficiency 0.80 (design)absorber tube evacuated glass envelope, UVAC® or other,
application dependentFluid oil, steam, application dependentcost < 200 Euro/m2
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 9
www.eurotrough.com
so what is new?
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 10
www.eurotrough.com
Wind-tunnel results
pressures in kN/m2 for max. bending (left), max torsion (right)
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 11
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Wind tunnel testing+ finite elements structural analyses
Bending
Torsion
(b)
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 12
www.eurotrough.com
EuroTrough support structure
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 13
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Optical Performance under Wind Loads
0
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0 2 4 6 8 10 12 14 16 18 20
Twist in mrad
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d sp
eed
(m/s
)
spill
age
in % LS-3 average twist of SCE on wind
ET4 average twist of SCE on windET6 average twist of SCE on windspillage losses due to twisting
5 m/sLS-3
ET-4
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 14
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EuroTrough Structural Elements
a b c d eEuroTrough collector element consisting out of
(a) 2 endplates(b) 4 simple steel frames screwed to a torque box(c) 3 HCE supports(d) 14 cantilever arms and (e) 28 mirror facets.
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 15
www.eurotrough.com
EuroTrough Prototype
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 16
www.eurotrough.com
EuroTrough Solar Collector Element - weights
EuroTrough CollectorComponent
strong SCE “field” SCE
Glass mirrors kg 747 747HCE (incl. oil) kg 73 73Torque box kg 597 597End Plates kg 186 130Cantilever Arms kg 384 231HCE supports kg 113 90Torque Transfer kg 32 32Total weight steel structure only kg 1,312 1,080Specific weight steel only kg/m² 19.0 15.6Total weightincl. mirrors and HCE
kg 2,132 1,900
Specific weight kg/m² kg/m² 30.9 27.5
INABENSAIn sta la ciones Abengoa , S.A.
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ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 17
www.eurotrough.com
EuroTrough Collector Assembly
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 18
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Assembly Jig
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ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 19
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EuroTrough project results
� various design studies� many design details addressed� collector drawings available� prototype collector started up� cost estimations for series production� performance models � market analyses� design review and continuation� world-wide exploitation opportunities� project consortium established
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 20
www.eurotrough.com
EuroTrough resultscost reduction aspects
� following cost reduction potentials have been identified:• cost reduction by improvement of the optical performance
of the collector • rigid support structure --> frame work torque box• manufacturing • assembly accuracy
• cost reduction by simplification of the design• less different profiles, parts• better transportation • assembly concept
• cost reduction by weight reduction of the structure• frame work structure, closed profiles• finite element method for structural design calculations• wind analyses for proper definition of the load cases
• Further cost reduction achieved in additional steps towards inclination of the collector and extension of collector length per drive unit (EuroTrough II).
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 21
www.eurotrough.com
EuroTrough performancethermal testing at PSA� with oil loop up to 390°C� in east-west orientation
(normal incident radiation once a day)
� influence of � fluid temperature� solar radiation (direct normal)� incidence angle
� photogrammetry� mechanical analyses
Receiver
Reflector
QLoss
QSun
QRec
QGain
ηopt
ηgeo η
thermε
A
α A
ρ Coll τG
ιColl
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 22
www.eurotrough.com
Photogrammetric Analysis
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 23
www.eurotrough.com
3D-Analysis of Reflector Geometry
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 24
www.eurotrough.com
EuroTrough Project Prospects
� world wide GEF projects� Spain� Greece
� …� EU directive for renewables
� European project developments
INABENSAIn sta la ciones Abengoa , S.A.
Schlaich Bergermannund Partner GbR
SOLEL
ASME Solar Energy: The Power to Choose, Washington, DC, April 21-25, 2001 25
www.eurotrough.com
Summary
� European solar parabolic trough collector� known geometry� wind loads analysed� improved support structure� cost reduction achieved� prototype testing at Plataforma Solar
�� European solar parabolic trough collectorEuropean solar parabolic trough collector� known geometry� wind loads analysed� improved support structure� cost reduction achieved� prototype testing at Plataforma Solar