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Optical Qualification of Parabolic Trough Receivers with a Solar Simulator Bench of the 2nd Generation
Johannes Pernpeintner Christoph Happich, Niels Lichtenthäler, Fabian Schmitz
> 16. Kölner Sonnenkolloquium 2013 > Pernpeintner 2013/06/13
Motivation of DLR to do qualification of parabolic trough receivers - DLR goal: Support the market launch of solar thermal power
- Strategy
measurement technology development, publication, standardization independent measurement services …
- Measurements relevant for EPC plant operator manufacturers
→ Reduced cost of solar thermal power
best receiver for money reduced risk costs
www.DLR.de • Folie 2
> 16. Kölner Sonnenkolloquium 2013 > Pernpeintner 2013/06/13
Parabolic Trough Receiver Testing at DLR
www.DLR.de • Folie 3
Acellerated Ageing
Performance Tests
Bellow Fatigue Test Overheating Test
Thermal Performance Optical Performance
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
- Optical efficiency ηopt,rec(T) - Thermal loss power Pth,loss(T)
Performance Parameters
Pcoll = ηopt,rec Pin – Pth,loss
www.DLR.de • Folie 4
> 16. Kölner Sonnenkolloquium 2013 > Pernpeintner 2013/06/13
Non-destructive optical efficiency measurement at independent research institutions
[1] SolarPACES Granada 2011, Mateu [2] SolarPACES Granada 2011, Kutscher
www.DLR.de • Folie 5
NREL [2] DLR/Ciemat Kontas, Sandia Aztrac
CENER [1] DLR ElliRec, OptiRec
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Solar Simulator Receiver Test Bench
Principle - calorimetric measurement of optical
efficiency
Conditions - solar simulator lamps - elliptical mirror trough with flat end
mirrors - receiver at room temperature - relative measurement
(reference receiver)
www.DLR.de • Folie 6
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Test benches
www.DLR.de • Folie 7
1st generation, ElliRec
2nd generation, OptiRec
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Test bench comparison
www.DLR.de • Folie 8
1st Generation ElliRec
2nd Generation OptiRec
lamps metal halide metal halide
mirror aluminum glass
ellipse orientation horizontal vertical
semi major axis 1026 mm 500 mm
semi minor axis 700 mm 400 mm
numeric excentricity 0.73 0.6
lamps 4x 4kW 6x 2.5 kW
receiver change during operation no yes
flow rate 850 l/h 850 l/h
displacement body yes yes
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12 www.DLR.de • Folie 9
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Transfer to Real Collector
www.DLR.de • Folie 10
Solar field Solar simulator
Irradiance, spectral ASTM 173d lamp * mirror
Irradiance, spatial homogenious homogenious
Irradiance, circumferential inhomogenious inhomogenious
Irradiance, angular all positions see all angles
angles and positions correlated
Temperature 300… 400 °C room temperature
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Transfer to Real Collector
www.DLR.de • Folie 11
Solar field Solar simulator
Irradiance, spectral ASTM 173d lamp * mirror
Irradiance, spatial homogenious homogenious
Irradiance, circumferential inhomogenious inhomogenious
Irradiance, angular all positions see all angles
angles and positions correlated
Temperature 300… 400 °C RT
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12 www.DLR.de • Folie 12
0.6
0.65
0.7
0.75
-3000 -2000 -1000 0 1000 2000 3000
Inte
nsitä
t [W
/cm
^2]
Absorberlänge [mm]
Längsverteilung über den Umfang gemittelt (Simulation)
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Transfer to Real Collector
www.DLR.de • Folie 13
Solar field Solar simulator
Irradiance, spectral ASTM 173d lamp * mirror
Irradiance, spatial homogenious homogenious
Irradiance, circumferential inhomogenious inhomogenious
Irradiance, angular all positions see all angles
angles and positions correlated
Temperature 300… 400 °C RT
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12 www.DLR.de • Folie 14
-200 -100 0 100 200
Inte
nsitä
t [b.
E.]
Umfang [°]
Umfangsverteilung gemittelt über die Absorberlänge skalierte Flächen
Eurotrough
Optirec
Ellirec - Axial -16kW
0
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Transfer to Real Collector
www.DLR.de • Folie 15
Solar field Solar simulator
Irradiance, spectral ASTM 173d lamp * mirror
Irradiance, spatial homogenious homogenious
Irradiance, circumferential inhomogenious inhomogenious
Irradiance, angular all positions see all angles
angles and positions correlated
Temperature 300… 400 °C RT
> 16. Kölner Sonnenkolloquium > Pernpeintner 2013/06/12
Correction for optical efficiency at operating temperature
www.DLR.de • Folie 16
Approximation: incidence angle = 0
> 16. Kölner Sonnenkolloquium 2013 > Pernpeintner 2013/06/13
Conclusion and Outlook
- 2nd generation of linear focus solar simulator test bench, has been developed, 1st measurements have been performed
- High reproducibility σ ~ 0.2 %
- Investigation of systematic effects ongoing spectral angular
www.DLR.de • Folie 17