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1. SOLAR THERMAL POWER!
GEEN 4830 – ECEN 5007!
10. Concentrating Linear Fresnel Reflectors!
Manuel A. Silva Pérez
!
silva@esi.us.es !
2. Fresnel reflectors
} Geometrically, ideal reflectors for solar energy collection are
continuous reflectors (PD, PT)
} Large continuous reflectors (or lenses) can be approximated
by smaller elements distributed over a plane (CRS, LFR)
} The design enables the construction of lenses of large aperture
and short focal length without the weight and volume of
material that would be required in conventional lens design.
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GEEN 4830 – ECEN 5007
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3. The278]
Ref. p. Fresnel reflector principle
4 Solar power 251
z
Focal point
y1
y2
P0
P1
Fig. 4.1.10. Fresnel geometry using
P2 three confocal parabolas P0, P1 and P2.
H x The height of the Fresnel optics is H.
The curvature of the elements is de-
creasing with the distance from the
Paraboloid slices
central line.
} Source: Neumann, A.: 4.1 Solar thermal power plants. Heinloth, K. (ed.). SpringerMaterials - The Landolt-
Börnstein Database (http://www.springermaterials.com). DOI: 10.1007/10858992_10
4.1.2.6 Fresnel geometry
Building a large single piece paraboloid is expensive, so other designs would be preferable for the pur-
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pose of energy collection. An alternative is the Fresnel reflector which is composed of parabola slices
mounted on a flat surface. The flat mounting surface has advantages with regard to practical engineering
4. First LFR prototypes
} 1964 Giovanni Francia (IT)
} 1970’s FMC
} 1993 University of Sydney
} 1998 Solarmundo (BE)
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GEEN 4830 – ECEN 5007
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5. Concept
} Line focus concentrating system
} Array of nearly-flat reflectors (mirrors) that concentrate
sunlight onto elevated linear receivers
Sun rays
2nd stage concentrator
Primary fresnel reflectors
Absorber tube
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GEEN 4830 – ECEN 5007
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6. Advantages
} Low cost for structural support and reflectors
} Fixed fluid joints
} Receiver separated from reflector
} Long focal length (allows for nearly flat mirrors)
Ø LOW COST ALTERNATIVE TO PARABOLIC TROUGHS
Disadvantages
• Low concentration -> limited maximum
temperature
Ø LOW EFFICIENCY
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GEEN 4830 – ECEN 5007
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7. Nova 1 LFR Module (source: Novatec)
Fresnel collector
n Base module of 513 m2
#
• 128 Primary Reflector Units track sun
using 2 x 40 Watt motors
9
• Land use factor = 50%
• Thermal Power Capacity = 306 kW
4
• Solar-to-Thermal Conversion Factor:
'
68% (?)
n Direct steam production
n Saturated steam at 270°C, 55bar
n (next product generation for
superheated steam at 350° in
2011)
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GEEN 4830 – ECEN 5007
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8. Compact linear fresnel reflectors
} Efficient land use by using 2 parallel receivers
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GEEN 4830 – ECEN 5007
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10. Applications
} Stand-alone
} Solar booster
} Thermal energy generation
} Solar cooling
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GEEN 4830 – ECEN 5007
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11. Basic configuration of a DSG CLFR power plant
Solar field
To Grid
Steam
Electric
Sun
Steam
Turbine
Generator
Steam
Steam
Dryer
Cooling
Water
Hotwell
Condenser
High Pressure Cooling
Cycle Supply Tower
Pump
Water
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GEEN 4830 – ECEN 5007
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