Long Term Reference Stations

To determine if data from a historical site are adequate to describe the long-term wind resource at another site, the analysis should be done rigorously. Simon and Gates [18] recommend that the annual hourly linear correlation coefficient be at least 0.90 between the reference site and off-site data. Remember to take into account wind shear if the heights are different at the two locations. If the two sites are not similar in wind speed and direction trends and do not have similar topographic exposure, then they will probably not have that correlation value. Long-term reference stations should be considered in all locations in the world where there is wind power potential. These stations should continue to collect data even after a wind farm has been installed. Not only will this improve siting of wind farms, but it will provide reference sites for delineating the wind resource for single or distributed wind turbines in that region. As wind turbines have increased in size, the hub heights are higher, and because in most locations wind speed increases with height, there is a need for reference stations to collect data at least at 50 m, and if possible to 100 m.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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