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Wind Speed by Anemometer

Wind speed is usually measured by an anemometer, using the Beaufort wind force scale which is a scale of 0-12. Details of the physical conditions by which the modern Beaufort scale is determined can be found at the website link below.

Specific wind speeds are used to define cyclones and hurricanes, and may be measured in knots (nautical mile/hour), miles per hour or kilometers/ hour.

Wind Energy Generation

If measuring wind speed for wind turbines, it is necessary to use a wind logger, which is a recording device used to anticipate the speed and duration of winds. The logger should meet the following criteria:

  • Able to record wind direction into a minimum of 16 bins (or wind directions, e.g. NNE, SSW)
  • Able to store historical data of the wind, as opposed to just the average wind speed for a month or for a year
  • Record average wind speed at least once per minute for small scale wind turbines, or once every 10 minutes for large scale wind turbines.
  • Logging at different heights
  • Compute standard deviation or variations in the wind (this is very useful since wind may be very very calm 75% of the time yet much higher 25% of the time.

To find out how much time a wind turbine will be producing power, look into how many hours of good wind a site has. There are charts comparing energy availability using the typical mean average method, and counting the number of hours at different wind speeds.

(see related link)


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