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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorBry Lynas
    • CommentTimeNov 15th 2009
     
    I've collected almost one year's worth of data from a La Crosse anemometer on 11m pole. The data on actual windspeeds come as 'windspeed' (89760 data points) and 'Gust speed' (57271 data points). 'Wind speed' averages (via speadsheet calculation) 3.58 m/s with 'Gust speed' averaging 6.6 m/s. Simple question: what is my average windspeed? Is it simply the lower figure? Or is it Wind Speed + Gust Speed divided by 2. I assume that my average windspeed is 3.58m/s so far as considering installing a wind turbine is concerned. There doesn't seem to be anything about this 'out there' on the web. Can anyone give me a simple answer please?
    • CommentAuthorCWatters
    • CommentTimeNov 15th 2009
     
    More info required on how the anemometer logs data. The 89760 wind speed samples represent one every 6 mins. I suspect each sample represents the average wind speed over the previous 6 mins. In which case it includes the gusts already. Check with la Crosse?
    • CommentAuthorBry Lynas
    • CommentTimeNov 15th 2009 edited
     
    I've searched the La Crosse (unhelpful) website for this info without luck. Like you, I assume this reading (every 5 minutes, but there are small gaps in data when batteries failed or I forgot the download the stored data from the base station's limited memory) is itself an average. It sounds like I ignore the gusts info so my average speed is around 3.6m. Surprising in NW Wales! Thanks anyway.
    • CommentAuthorCWatters
    • CommentTimeNov 15th 2009
     
    Perhaps contact one of these and see how their data for last year compares..
    http://www.weatherstations.co.uk/aws_map.htm
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