One of the most basic of problems for the energy created by a wind turbine, is that the wind does not constantly blow, and this could result less energy production than the standard power plants or nuclear power plants, which harness up to ninety percent of the available energy. One of the best wind turbines, will at its optimum harvest just thirty percent of the energy that is potentially available. This has caused many of the production companies building turbines today to step up and find ways to increase the productivity of each turbine.
One of the aspects that the designers are focusing on is the length of each individual blade. Longer blades can increase the energy stored. Standard wind turbines today are designed with three blades that had before been three hundred and five feet in diameter. The newer designs will reach up to three hundred and thirty feet in diameter. This increases what is called the sweep area, the circular motion of the air that provides the energy for the wind turbine to capture. This increase constitutes an eighteen percent increase in the size of the turbines.
If the wind constantly blew and blew hard, then the size of the blades does not make a difference. Even at moderate rates, the energy output of each turbine is elevated. When the wind blows at the rate of seventeen miles per hour, the larger length blades will have the output go up by almost eight percent, as opposed to the smaller blades. The larger blades do not turn faster, but the energy they capture from the air that passes over them increases.
This is a great new aspect in that this can mean that areas that are not high wind will still be able to utilize this alternative form of energy. But there are some limits to consider, such that when the blades get longer, the more difficult it becomes to transport the blades from the factories in which they are built, to the top of the hills where the turbines are usually placed. And the production of these blades is much more expense. However, the benefits have been seen in the newer wind plants in the US states of Washington and Minnesota, as well as throughout the country of Denmark.