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Wind Resource Assessments

"The Answer Is Blowing in the Wind!"

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Wind Resource Assessment
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What is a Wind Resource Assessment?


A
Wind Resource Assessment is defined as the process of characterizing the wind resources, wind characteristics and the site's wind energy potential for that specific site or geographical area.


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2-Bladed Wind Turbines

Versus

3-Bladed Wind Turbines

Out-dated, Inefficient 2-Bladed Wind Turbines Are "Extinct." 

Why 3-Bladed Wind Turbine Generators are Far Superior and 
More Efficient than 2-Bladed Wind Turbines

The argument has been settled and the debate is over. 

Today's "modern" 3-bladed wind turbines represent the latest technological improvements in wind turbine generators, and are superior to the 20-30 year old technology that 2-bladed wind turbines represent.

First of all, it is important to remember that 2-bladed wind turbines may generate only about 90% of the power of a 3-bladed wind turbine of comparable size.  While a 2-bladed wind turbine saves the weight of one extra blade when compared with a 3-bladed wind turbine, engineers of the most efficient wind turbines have determined that the extra blade used on 3 bladed wind turbines provide the optimum wind turbine efficiency and wind turbine design for the "ideal" wind turbine generators of today.  

Secondly, the top-3 leading wind turbine manufacturers have standardized on the 3-bladed wind turbine.  They do not manufacture any 2-bladed wind turbines.  Plainly stated, a wind turbine with an even number of blades (2 blades or 4 blades) are NOT of optimum design or efficiency. In fact, this debate was settled years ago when the wind turbine engineers and designers began building wind turbines over 600 kW in power output.

The leading wind turbine manufacturers and their engineers have decided that 3 bladed wind turbines are the optimum number of wind turbine blades due to the stability of the wind turbine as well as the significant wind loads and stresses placed on a 2-bladed wind turbine.  A wind turbine that has an odd number of blades is similar to a disc when calculating the computational fluid dynamics of the wind turbine.  Engineers have learned that wind turbines that have an even number of blades - such as the 2 bladed wind turbines of the past - have stability problems for a machine with a stiff structure. The reason for this problem is simple, engineers recognized that when a 2-bladed wind turbine's top blade bends backwards - when the wind turbine's 2 blades are in the vertical position - since it is now generating the maximum power from the wind - that the lower or bottom blade is now aligned with the tower and the blade is hidden or blocked from the wind - and this generates a huge amount of stress and loads on the wind turbine and its' primary components such as the bearings, shaft, transmission etc.

Because of the extreme wind loads and stresses placed on 2-bladed wind turbines, the remaining 2-bladed wind turbine manufacturers have had to resort to a "teetered hub" that helps remove some of the stress and loads placed on 2-bladed wind turbines. While there are some very fine 2-bladed wind turbines, of smaller power output, the bottom line is, 3 bladed wind turbines are inherently better and more efficient than 2-bladed wind turbines.

For these reasons, community wind farm owners and developers, along with utility-scale wind farm owners and developers, would be wise to only consider 3-bladed wind turbines. 


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Nothing quite compares with the opportunities in renewable energy technologies, and in particular, wind energy and wind farm development.

Wind energy and wind farm development is big business, and this is only the beginning! Today, less than 1% of our energy comes from wind energy. 

President Bush and the U.S. government are calling for 20% of our nation's energy to come from wind energy by 2020. 

Hundred of billions of dollars will be invested and made in wind energy!  

Now is the time to get in on the ground floor of the wind energy and wind farm development business!  

Look at the following facts about wind energy, according to the American Wind Energy Association (www.awea.org):


More about Wind Resource Assessments


A Wind Resource Assessment is defined as the process of characterizing the wind resources, wind characteristics and the site's wind energy potential for that specific site or geographical area.

 

Wind Resource Assessment


Graphic wind maps of the state of Montana, USA, showing resource potential across the state.


All markets for wind turbines require an estimate of how much wind energy is available at potential development sites. Correct estimation of the energy available in the wind can make or break the economics of wind farm development. Wind maps developed in the late '70s and early '80s provided reasonable estimates of areas in which good wind resources could be found. But new tools and new data available from satellites and new sensing devices now allow researchers to create even more accurate and detailed wind maps of the world.

Wind mapping techniques developed by the National Renewable Energy Lab ("NREL") and U.S. companies are being used to produce high-resolution projections of U.S. and foreign regions that are painting a whole new picture of wind potential. These maps are created using highly accurate GPS mapping tools and a vast array of satellite, weather balloon, and meteorological tower data, combined with much-improved numerical computer models. The higher horizontal resolution of these maps (1 km or finer) allows for more accurate wind turbine siting and has also led to the recognition of higher-class winds in areas where none were thought to exist.

The ability to accurately predict when the wind will blow will help remove barriers to wind energy development by allowing wind-power-generating facilities to commit to power purchases in advance. NREL researchers work with federal, state, and private organizations to validate the nation's wind resources and support advances in wind forecasting techniques and dissemination. Wind resource validation is important for both wind resource assessment and the integration of wind farms into an energy grid. Validating new, high-resolution wind resource maps will provide an accurate reading of the wind resource at a particular site. Development of short-term (1 to 4 hours) forecasting tools will help energy producers proceed with new wind farm projects and avoid the penalties they must pay if they do not meet their hourly generation targets. In addition, validating new high-resolution wind resource maps will give people interested in developing wind energy projects greater confidence as to the level of wind resource for a particular site.

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