People have been tapping the power of wind for thousands of years to power windmills and drive sailboats. Without the power of wind, there would be no history of great explorers like Christopher Columbus, Vasco Nunez de Balboa, and John Cabot who voyaged across oceans and seas to explore the wonders of the world. Also, our ancestors would have struggled to travel across seas and oceans to trade with other nations. Excessive heating of earth due to burning of fossil fuels have forced people across the globe to generate power through wind.
Like any other source of power generation, wind energy has its own set of advantages and disadvantages. Before we get to understand what wind energy is, it would be helpful to know how winds are formed. This basically implies that as long as the sun is shining, wind will be available.
When the sun shines, the air occurring over the surface of the land heats up pretty quick than that occurring over water. The heated air is relatively lighter, and so it begins to rise. On the other hand, the cooler air is denser, and so it falls and takes the place of the air occurring over the land.
When night falls, the exact opposite happens. Air occurring over the water is warmer, and so it rises, and its place is taken over by the cooler air coming from land. This series of moving air is known as wind and harbors vast amounts of kinetic energy. So, wind energy is energy derived from the motion of the wind.
Essentially, the speed of the wind, which is full of kinetic energy, is harvested and converted into mechanical energy to be used to turn windmills. The energy can also be converted into electricity. By installing turbines in their paths. The speeding winds will turn the turbine, which is tethered to a generator. The turning turbine will spark the generator to produce electricity. The potential of wind energy is enormous. The advantages and disadvantages of wind energy are in depth.
The top of the tower has the gearbox is fitted. The two sides of gearbox are one side is blade and other end has generator. The direction of wind flow has turned nacelle setup by the yaw drive system. The wind velocity measurement, brake system and hydraulic unit are controlled by the electronic control unit. The yaw drive system is placed in that the vertically downward to the gearbox base plate.
The rotor blades are usually two or more in number and are made of Glass-fibre reinforced plastic or Epoxy resin laminated wood. It also includes structures of Aluminum Copper for lightning protection and steel for the connection to the hub. The hub in turn transfers the energy to the low speed shaft. Blade designs operate on either the principle of drag or lift. For the drag design, the wind pushes the blades out of the way. The blades can be rotated by using either drag force or lift force.
Drag powered wind turbines are characterized by slower rotational speeds and high torque capabilities. Blades come in many shapes and sizes, and there is continuing research into which design of blade is best. It turns out that the optimal design really depends on the application, or where and how the blade will be used.
This is the ratio between the speed of the wind and the speed the blade tip. Fiberglass rotor blades represent the most vulnerable components of a wind turbine. Lightning, Vibrations or contact with the tower can result in major damage to the blades.
Design errors and manufacturing defects can also cause problems in the rotor blades during its operation time. For example, blades can develop cracks at the edges, near the hub or at the tips.
The possibility of the bolts breaking due to overload also cannot be ruled out. Brakes are used to stop the rotation of rotor shaft in case of power overload or system failure. The High speed shaft is equipped with an emergency mechanical disc brake, which is used in case of failure of the aerodynamic brake, or when the turbine is being serviced.
The low speed shaft of the wind turbine connects the rotor hub to the gearbox. The low speed shaft rotates at relatively slow speed of about 19 to 40 revolutions per minute and transfers the rotational energy from the hub to the gear box. The shaft contains pipes for the hydraulics system to enable the aerodynamic brakes to operate. This energy was utilised in sailing ships and wind mills since ancient days. In India the generation of electric power through wind mills started in and by March about 2, wind pump sets has been installed in seven states of the country.
At the beginning of the Eighth Plan the installed capacity of wind-based power generation was a mere 40 MW. Also, for the first time during India has exported a wind turbine and that too to Australia. The total potential for wind energy in the country is estimated to be 20, mw. This estimate is based on the technology available during the mid- 80s. A wind speed above 10 km per hour is prevalent over parts of coastal region and on the river banks in Rajasthan, Gujarat, Maharashtra and Karnataka.
Wind mills can be operated there to harness wind energy.
[tags: energy, wind, power] Good Essays words | ( pages) | Preview. Wind - A Renewable Energy Source - Wind - A Renewable Energy Source Wind is called a renewable energy source because wind will continually be produced as long as the sun shines on the earth. The sun’s contribution to wind energy deals with converting air into heat or.
Wind Energy Essay. Essay on Wind Energy. Words | 10 Pages. Therefore, wind power rise as it is a source of clean, non-polluting renewable energy (Nash, ). This type of energy generation provides us with loads of benefits environmentally and economically. On the environmental aspect, wind energy does not contribute to pollution as.
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Humans have used wind as a source of energy since the invention of sailing craft and windmills. And just as the wind has been harnessed to propel boats swiftly. Wind energy is an important non-conventional source of energy. There is a simple relation between wind, velocity and power. If a wind with a velocity of 10 km per hour gives one horse power, a 20 kmph wind will produce 8 hp. Winds with speed from 12 to 20 kmph capable of moving leaves and small.