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For many
years, solar laboratories around the world have joined forces,
intensively cooperating in the field of concen-trated solar irradiance
measurements. This is expressed by past international campaigns aiming
at the comparison of flux density sensors.
Intercomp 2006 was held by the SolLab European Laboratory Alliance to
compare flux density sensors, and detect potential errors. SolLab was
formed in 2004 by the Laboratoire Procédés, Matériaux et Energie Solaire
(PROMES-CNRS), the Solar Research Division of DLR’s Institute of
Technical Thermodynamics (DLR), the Plataforma Solar de Almeria (PSA-CIEMAT)
and the Swiss ETHZ Renewable Energy Carriers Laboratory (REC-ETHZ).
The flux density ranges were selected according to the spe-cifications
of the participating instruments:
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Low Flux
Group I: 0 – 50 suns
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Low Flux
Group II: 0 – 300 suns
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High
Flux Group I: 0-1000 suns
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High
Flux Group II: 0-5000 suns
11 different
instruments (cold water calorimeters, Gardon type sensors, Kendall
radiometers, and a new type sensor brought by CNRS, were compared.
Calorimeters, Kendalls and the new CNRS sensor compared well, while the
Gardon-type instrument data deviated more. The maximum deviation was on
the order of 18%.
The campaign was successful, and each participating party was able to
collect valuable information. Occasional compar-ative measurement has
become an absolutely necessary task.
Publications:
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