anemometer calibration

Wind speed measurement is essential to characterize the wind energy-generating potential of a given location in different weather conditions, and equally essential for infrastructure safety. On construction worksites for example, accurate wind speed measurement is essential before erecting tower cranes to avoid any risk of collapse. In other sensitive locations, such as alongside high-speed rail tracks and high-rise buildings, wind strength is measured over a limited time window (using a field measurement campaign) or continuously (using a Meteo-France weather station) to monitor and prevent strong wind such as storms.

Wind measurement must be accurate and reliable. Any variation in estimated wind levels can have a very significant effect on the safety of people and property, or on wind farm operating revenue.

CSTB support The CSTB is a member of MEASNET, is COFRAC- accredited, and offers industry professionals a range of services to ensure successful outcomes for projects involving wind resource, and projects where the effects of wind are an issue. These services focus on accurate and reliable anemometer calibration. CSTB experts are able to rely on their expertise

The CSTB offers reliable, accurate wind speed measurement.

Onsite measurement campaign mast with propeller anemometer

Anemometer calibration

N A N T E S O F F I C E C A P E ( C l i m a t o l o g i e - A é r o d y n a m i q u e - P o l l u t i o n - É p u r a t i o n )

1 1 , R U E H E N R I P I C H E R I T | B P 8 2 3 4 1 | 4 4 3 2 3 N A N T E S C E D E X 3

T E L . + 3 3 ( 0 ) 2 4 0 3 7 2 0 0 0 | F A X + 3 3 ( 0 ) 2 4 0 3 7 2 0 6 0 | w w w . c s t b . f r / n a n t e s / e n /

CENTRE SCIENTIFIQUE ET TECHNIQUE DU BÂTIMENT - SCIENTIFIC AND TECHNICAL CENTER FOR BUILDING MARNE-LA-VALLÉE PARIS GRENOBLE NANTES SOPHIA-ANTIPOLIS

> ASSESSMENT

in climatology, and on a range of advanced facilities, including on-site sensors and the dedicated µSE wind tunnel in Nantes.

Calibrations are carried out in the CSTB µSE wind tunnel in Nantes in accordance with IEC 61400-12-1:2005/Annex F and the MEASNET procedure. They are accredited by the French accreditation body COFRAC as NF EN ISO/CEI 17025 compliant (see www.cofrac.fr, no.2-1930).

µSE (Eiffel type) wind tunnel at CSTB Nantes (France)

The CSTB is a member of MEASNET (MEASuring NETwork), the international network for harmonized and recognized measurements in wind energy. It is one of nine MEASNET laboratories that guarantee the quality of the anemometer calibration service they provide, and are committed to uniform interpretation of standards and regulations in order to ensure high quality calibration. Round robin tests are conducted to validate the robustness of the procedures used.













The µSE wind tunnel provides laboratory conditions under which to study the behavior of an anemometer at full scale by reproducing its actual conditions of use. It can generate wind speeds of up to 30 meters per second.

Technical specifications > Wind tunnel cross section: 0.79 m x 0.79 m (0.624 m2)> x, y and z axis flows are uniform to within 0.2%> Turbulence intensity is less than 2%> Repeatability and reproducibility of µSE

measurements checked by reference anemometer> Anemometer types calibrated: propeller and cup> Output types tested: voltage, current and frequency> Reference wind speed measured with Pitot tubes

and pressure sensors> MEASNET (4-16 m/s) calibration and/or COFRAC

calibration (4-20 m/s)> Sonic anemometer performance assessment

(accreditation in progress). Anemometers being calibrated in the µSE wind tunnel

C on t ac t sM a e v a S A B R E > +3 3 ( 0 ) 2 4 0 3 7 2 0 1 8 > m a e v a . s a b r e @ c s t b . f r J é r ô m e V INE T > +3 3 ( 0 ) 2 4 0 3 7 2 0 1 7 > j e r o m e .v i n e t @ c s t b . f r

CSTB Nantes facilities: the µSE wind tunnel

References- IEC 61400-12-1:2005 “Wind turbines – Part 12-1: Power

performance measurements of electricity producing wind turbines, Annex F : Cup anemometer calibration procedure”

- MEASNET Measurement Procedure: “Cup anemometer calibration procedure”, v2 2009

- ISO/IEC 17025:2005 “Exigences générales concernant la compétence des laboratoires d’étalonnages et d’essais”

- ISO/CEI GUIDE 98-3:2008, “Incertitude de mesure - Partie 3 : guide pour l’expression de l’incertitude de mesure” (GUM : 1995)

- NF ISO 5725-1 et 2:1994 “Exactitude (justesse et fidélité) des résultats et méthodes de mesure”

- Coquilla R. V., Obermeier J. , 2007, “Calibration procedure and uncertainty in wind power anemometers“, Wind engineering, 31, no. 5, 303-316

- Dahlberg J. Å., 2006, “An investigation of wind tunnel blockage effects on cup anemometer calibrations“, Technical Report FOI R-2006—SE (Swedish Defense Research Agency FOI)

- Eecen P.J., de Noord M., 2005, “Uncertainties in cup anemometer calibrations” by ECN 05-066

- Sabre M., Jéhu A., Flori JP., Tétard Y., Brébion H., 2011, “Qualification of the µSE CSTB-CAPE wind tunnel for anemometer calibration“, EWEA 2011, Brussels, Belgium

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The µSE open test section wind tunnel

anemometer calibration

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