Wind powered turbines are one of the most reliable kinds of green power sources in the world. They are designed to generate power by transforming the kinetic energy of the wind into mechanical energy, which is then either harnessed directly (in the case of windmills, for example, which were used to transform corn into flour, or to pump water for irrigation) or connected to an electrical generator that generates a DC electrical output that can be used in a more general sense. In this publication I will be talking about the type of wind generators that output electric energy, as this is more useful to us.
Wind turbines are basically large windmills, with gigantic blades that rotate as a result of the wind and produce energy from the conversion of the winds power. Wind turbines are constructed of fiberglass, aluminum, steel along with various other space age materials.
Wind generators have several negative impacts on the environment. They are quite visible, and very unsightly since they must be located in proximity to windy, fairly open terrain to be feasible – attempts to position them off the coast have been met with a lot of success. Wind Turbines require a great deal of energy in their production, energy which is typically fossil-based, and therefore it takes considerable time before they are positive in terms of carbon emissions – this period can be anywhere from 2 to 6 years. They are often associated with the killing of birds that can be mutilated as they pass through the turbine blades during migratory passages although this issue is heavily debated.
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With all of the downsides aside, wind turbines should be a logical choice when talking about a broad strategy for renewable energy, in those areas that are well suited to them. Once constructed, wind turbines are amazingly efficient in a larger sense – they generate energy from a natural, eco-friendly renewable resource, without the social or environmental penalties that we incur with the consumption of fossil fuels – there is no need to mine for fuel or to transport it – there arent any greenhouse gas pollutants generated, and no need to contain, treat, or to eliminate wastes.
At the low end of the spectrum, turbines can be as small as 4 feet in diameter and might be capable of only a few hundred watts of output. On the large end of the scale, turbines can be as massive as 200 feet in diameter and may be capable of generating three to four megawatts of power.
Like with photovoltaic solar power generation, there might be rebates available for construction, and energy in excess of that which we are using can be sold back to the grid.
Wind speed is affected by terrain and increases with altitude, so wind turbines are generally installed on top of large towers. In a typical application, the wind turbine sits on top of a tall tower and generates direct current that is used to charge batteries – this stored charge is ultimately utilized by flowing it through an inverter which changes the low voltage direct current power into high voltage AC power for use in household applications. By concentrating numerous turbines into wind farms a vast amount of power can be stored and harnessed, perhaps for a whole city or town.
Due to the fact that the wind doesnt blow all of the time in many areas, wind turbines are used as adjuncts in hybrid systems with many different technologies like photovoltaic panels, batteries, and diesel generators to generate a consistent source of electricity.
Unlike fossil-fuel power stations, wind turbines are clean – they dont manufacture the CO2 emissions that are thought to be causing greenhouse gases or the SO2 emissions that cause acid rain.
Contemporary wind turbines are divided into two major categories, namely horizontal axis turbines and vertica turbines. Todays horizontal axis wind turbines are actually superior at capturing the wind than vertical axis machines given the same amount of swept area (which is the size of the circle traced by the outside tip of the rotor blades).
