The Laboratory for Wind Turbine Testing (LWTT) of CRES performs wind potential measurements using stand-alone stations capable of recording wind speed and direction, as well as supplementary meteorological parameters (atmospheric pressure, temperature, humidity). A digital data acquisition system is used to collect measurements and store pre-processed data in both a buffer and a flash card. The duration of each data set is usually fixed at 10 minutes. For each interval, standard statistical analysis of the collected magnitudes is performed deriving averages, standard deviation values, max and min values. The measurement campaign duration is usually one year. Day-to-day follow up of the system status and frequent data downloading and re-programming is obtained through wireless transmission (GSM modem).

The results of the measurements are presented in Test Reports. For the data analysis WindRose© software is used. WindRose© ia an in-house developed Excel-Visual Basic application providing overall statistics, diurnal and monthly wind patterns, windrose diagrams per month for mean and maximum wind speeds, Weibull scale and shape parameters in total and sector-wise, turbulence dependence on wind speed and direction, calm frequency of occurrence etc. The test report also provides a thorough site description and an uncertainty estimation.

LWTT has performed wind regime measurements under contracts with developers and operators of wind farms and local government authorities in Greece, Italy, Turkey and Cyprus.

The Laboratory for Wind Turbine Testing of CRES is accredited according to the ELOT-EN ISO/IEC 17025:2005 by ESYD (Hellenic Accreditation System) under Certificate No 647 for Testing and Calibrations. The accreditation scope of the Laboratory includes wind speed and direction measurements for wind potential.