1. SOLAR THERMAL POWER!
GEEN 4830 – ECEN 5007!
9. Parabolic Dish Technology!
Manuel A. Silva Pérez
!
silva@esi.us.es !

2. Parabolic dish systems
} Combine a paraboloidal concentrator (parabolic dish) with a Power
Conversion Unit (PCU) directly attached to the concentrator
MDAC ('83-'88) Boeing/SES
} Types of PCU (ʻ98-ʼ99)
"
} Gas Turbines Advanco ('82-'85)
"
} Direct Steam Generation
} Stirling Engine SBP/Almeria"
('88-'99)"
SBP/Solo"
Cummins "
('89-'96)
"
SAIC/STM"
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3. Parabolic Dish + Gas Turbine
} Cummings 1996
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4. Parabolic dish - Direct Steam Generation
Dish collector field at Shenandoah, GA
• Industrial process heat project.
• 7 meters diameter,
• aluminized film reflector
Heat from the field was used in a textile plant for air
conditioning and process heat.
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5. Solar Village (Arabia Saudí)
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6. Parabolic dish – Stirling engine experiences
(source: Mancini et al. JSEE 2003)
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7. Parabolic dish – Stirling engine
} High performance
} High concentration ratio
} High temperature
} Modularity
} No water consumption
• High capital costs – Stirling engine and
concentrator
• High O+M costs – H2 refilling, engine
maintenance
10-kW EuroDish
• Durability of the engine
SBP/Solo-PSA"
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8. Dish – Stirling systems. Main elements
} Structure
} Concentrator
} Tracking system
} PCU
} Control
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9. Structure
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10. Structural optical surface
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11. Space frame structures
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12. Stretched membrane
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13. Concentrator
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14. Glass mirror-faceted
} Spherically curved mirrors
} Individually alignable
} Parabolic shaped structure
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15. Full surface paraboloid
} The entire surface forms a paraboloid
} Usually made of a number of ‘petals’
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16. Stretched membrane. Single facet
} Membrane
} Preshaped (vacuum not enough)
} Thin reflective plastic
} Thin metal sheet + reflective surface
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17. Stretched membrane - multifaceted
} Avoid the need for preshaping
} Difficult alignment
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18. Mounting
Pedestal Carrousel
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19. Tracking
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20. Polar tracking
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21. Elevation - azimuth tracking
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22. Receiver
} Absorbs concentrated solar energy and converts it to thermal
energy that heats the working fluid (gas) inside the engine.
} External (low temp.)
} Cavity (high temp.)
} Directly illuminated tubes
} Reflux
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23. Directly illuminated tubes receiver
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24. Reflux receiver
} Intermediate heat transfer fluid
} Decouple receiver and engine
} Pool boiler. The absorber surface is always immersed in a liquid
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25. Reflux receiver
} Heat pipe. A wick draws the liquid metal from a small sump
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26. Stirling Engine
} The Stirling cycle
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27. Stirling engines
} Kinematic
} Free piston
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28. Cleanergy, 10 kW
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29. Performance of Eurodish System
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30. Performance of the Eurodish System
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31. State of the art
} Most efficient solar to electric technology (>30%).
} Pre-commercial experiences
} Increase reliability
} Reduce costs
} Three (four) main manufacturers / systems today
} Tessera Suncatcher (SES) 25 kW
} Cleanergy / SBP Eurodish 10 kW
} Infinia Corp 3 kW
} (Ripaso Energy) 25 kW
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32. SES / Tessera Suncatcher
http://www.tesserasolar.com/
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33. SES / Tessera Solar, Maricopa 1.5 MW

34. Infinia
http://www.infiniacorp.com/
} 3 kW Free piston engine
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35. Infinia
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36. Eurodish
sbp.de
} 10 kW kinematic Stirling engine (SOLO V161)
} 8.5 m diameter concentrator
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37. Projects (Tessera Solar / SES)
} Imperial Valley (Solar 2) | Imperial County, California | San Diego
Gas & Electric (SDG&E)
750MW | Total of 30,000 SunCatcher™ Power Systems.
} Calico (Solar 1) | San Bernardino County, California | Southern
California Edison (SCE)
850MW | Total of 34,000 SunCatcher™ Power Systems.
.
} Western Ranch Solar | West Texas | CPS Energy
27MW |Total of 1,080 SunCatcher™ Power Systems.
} Maricopa Solar | Maricopa County - Peoria, Arizona | Salt River
Project (SRP)
1.5MW |Total of 60 SunCatcher™ Power Systems.
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38. Projects (Infinia)
} Infinia
} 100 kW demo plant,Vllarrobledo, Spain
} 70 MW (2 projects) in Spain
} SD G&E (demonstration projects)
} Cleanergy
} SOLARDIS (5 units x 10 kW)
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39. } Free piston engine.
} http://www.infiniacorp.com/howitworks.html
} http://www.youtube.com/watch?v=Fl8iNXsjsbI&feature=fvw
} Tessera /SES
} http://www.youtube.com/watch?v=z-MJrJpW2M0
} Infinia
} http://www.infiniacorp.com/powerdish.html
} Cleanergy
} Eurodish
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