ZephIR - independent correlations

Risø evaluation of ZephIR at Høvsøre, 2008
ZephIR is compared to the fixed anemometry at Risø’s Høvsøre 116m met mast. Ten minute average wind speeds are collected over a 10 week period at 4 heights. This recent study took place during the Spring of 2008.

Germanischer Lloyd WINDTEST evaluation of ZephIR offshore at FINO1 research platform, 2006
ZephIR is compared to the fixed anemometry over a six month period.





ZephIR evaluated at Risø’s Høvsøre test, 2009
ZephIR is compared to the fixed anemometry at Risø’s Høvsøre 116m met mast during a test campaign over Winter 2009.





Evaluation of ZephIR at a tall mast in North America, 2009
The identical ZephIR system tested above is also compared to the fixed anemometry at a 193m met mast during a test campaign in Spring, 2009.




The correlation graphs show the relationship between the wind speed readings from a cup and the corresponding wind speed readings from the ZephIR. Data are plotted against each other and a line of best fit drawn. By forcing this line of best fit through the origin its gradient, y, indicates the mean difference between the two readings. For example, a gradient of 1.01 would indicate a difference of 1%. The R² value gives an assessment of how well correlated the two sets of values are. If the cup and the ZephIR always read identically then the R² value will be 1, i.e. they are perfectly correlated. At the other extreme, an R² value of zero would indicate that the values bear no relationship to each other whatsoever.