The following equation quantifies the uncertainty on the long-term mean wind spe

Question

The following equation quantifies the uncertainty on the long-term mean wind speed based on the correlation coefficient,R2.?Ais the standard deviation of the annual mean wind speed as a percent of the mean,NRis the number of years of reference data,NTis the number of years of concurrent data.

?=?AR2NR+1?R2NT???????????????

How many years of concurrent data from a proposed wind project site are needed for the uncertainty of the long term mean wind speed to be below 2% if the mean of the onsite data is 7 m/s with a standard deviation of 0.4 m/s and it matches a 22 year long data set with an R^2 of 0.81?

Number of years of concurrent data (round to one decimal place)

Explanation / Answer

www.awstruepower.com/.../AWST_Using-MesoscaleModelData-in-..

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