Draw back of wind energy
Answers
Answer:
Generating electricity from wind energy reduces the need for us to burn fossil fuels. This not only reduces carbon emissions but also helps to conserve dwindling supplies of the earth's natural resources. As a result, reserves of fossil fuels like coal, oil, and natural gas will last much longer
Answer:
The limitations are both theoretical and technological.Of all the wind energy that a wind turbine sees, the theoretical maximum amount of energy that can be converted into electricity is 60%. For 100% efficiency, the wind speed behind the turbine blades would have to be zero. Other limitations include the amount of power output a wind turbine can have. The power produced by a turbine is proportional to the wind velocity cubed. This means, at low wind speeds (i.e. 4 m/s), there is a significant drop-off in the power produced versus moderate wind speeds (i.e. 7 m/s). Also, the power produced is proportional to the swept area, or another way of saying the same thing, is its proportional to the blade length squared. Clearly, infinite length blades are unrealistic. Therefore finite blade lengths have to be used, which gets into the technological limitations.
Explanation:
Limitations on Blades: Additional limitations involve the wind turbine blades. The most common method for producing wind turbine blades is fiberglass. This involves cutting multiple sheets of fiberglass to the shape of the blade and molding them with resin between each fiberglass layer. Small imperfections develop in the surface of the blade as the resin cures which can lead to premature failure during operation.[#2]
Limitations on Structure: At high wind speeds, the turbines become unsafe to operate. One of the main reasons for this is the vibrations caused by the high velocities. Because of this, the power output of a turbine must be limited to keep the turbine from being overloaded and/or from a catastrophic failure.
Limitations on Transmission: The modern electricity transmission grid is not so modern. Built for the energy needs 100 years ago, the grid is not suited to transport electricity for long distances, which are usually required for wind turbines since high wind speeds are often found in less populated areas. The problem is that transmission lines and the connections between them are too small for the amount of power companies want to squeeze through them.[#3]
Limitations on Energy Storage: Since wind turbines rely on wind to generate electricity, a calm day is a bad thing. Currently the capability to store extra electricity when it's not needed is virtually zero. This severely limits the practically of wind turbines as main stream power producers since they cannot provide a constant source of electricity.