Added on -2019-09-20

The humankind has used it for centuries as there are estimates that people were using this type of energy as far as 4,000 years ago. However, the ability to study the wind power across the horizontal axis was the first to measure in the 20th century (Kuwahata, 2013). Due to this, a torque is produced on the shaft and the rotor is seen to rotate around the horizontal axis turbine attached with a generator and a gearbox.
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2CHAPTER - 1INTRODUCTIONWind energy is one of the most reliable and abundant sources of renewable energy on this planet. The humankind has used it for centuries as there are estimates that people were using this type of energy as far as 4,000 years ago. In the year 1700, it was employed by the king of Babylon for irrigation purposes (Ackermann & Kuwahata, 2013). The wind was also for grinding grain by several farmers. It is also surprising to note that one of the earliest windmills had the vertical axis of rotation. The people use braided mats or sails for rotating these windmillsacross the vertical axis. These windmills had an operational advantage as they were independent of the direction of the wind.History of Wind PowerThe wind power was initially utilized by humans in the form of irrigation pumping, sailboats and garn milling. The history of wind power can easily be tracked back to the ancient 6,000 years ago. The sails, ships and sailboats were used on the Nile River though its water, in Egypt. The earliest known use of wind power was represented by the sailboats. Although as per today’s standard, it is considered to be a rudimentary use of wind but the technology impacted the development of the current sail-type windmills (Hansen, M. O., 2015). The first documented proof of the existence of such mills dates back to 12th century. However, the ability to study the wind power across the horizontal axis was the first to measure in the 20th century (Kuwahata, 2013).There are two types of wind turbines. One is built with high speed and is intended to generateelectricity whereas the other one is built for low wind speeds (Wahab et al. 2008). The major
3components of Wind turbines include a rotor with a set of blades with a rotor hub which is seen to deflect the airflow by creating a force on the blades. Due to this, a torque is produced on the shaft and the rotor is seen to rotate around the horizontal axis attached with a generator and a gearbox. All this is present inside the nacelle present with other important electrical parts with the tower end. Electricity is generated moving down from the tower to the transformer which is then converted from voltage (usually 700V, 33000V for countrywide grid, 240 V for the personaluse). The core windmills are termed as horizontal axis wind turbine (HAWT) and the vertical axis wind turbine (VAWT). The windmills using the horizontal axis of rotation are relatively new as compared to vertical axis ones. United States and Wind PowerDue to increasing high-energy costs, the government and the people are becoming highly concerned towards global warming, pollution and feel financially strapped at the same time (Bollen, Hers & Zwaan, 2010). With around 30 percent of the total world reserves, the United States have a vast coal supply (Hook & Aleklett, 2010). The annual production of United States is almost twice as compared to India and lacks only behind China (Hook & Aleklett, 2010). But it has been noticed that the US reserves are concentrated only in few states and have considerably decreased from 29.2 MJ/kg 23.6 MJ/kg in the period of 1950-2007 due to movement of subbituminous western coals by US (Hook & Aleklett, 2010). The production of one kilowatt hour (kWh) of electricity from coal is seen to produce 1kg of Carbon Dioxide (CO2), more than 200 grams of waste amounts of several metals and ash, seven grams of nitrogen oxides, sulfur oxides and particulates are released such as Methane (CH4), hydrogen sulfide (H2S), hydrocarbons ethane (C2H6), etc. (Stracher & Taylor, 2004).
4Benefits of Wind PowerAccording to Klingenberg (1996), CO2 levels were around 345,000 parts per billion in 1996 as compared to 290,000 parts per billion decades ago (Graedel & Crutzen, 1989). According to the U.S. Department of Energy, 2013, the dependency of the fossil fuels can be reduced using the wind energy as there is no emission of greenhouse gases. Although the generation of electricity is not just one cause of increasing CO2 level in the atmosphere but it contributes to a major shareof CO2 emission (Graedel & Crutzen, 1989). Therefore, the reduction of greenhouse gases in theatmosphere can be done by environmentally friendly electricity generation using wind power. The tunnel attachment of the wind has the ability of capturing low speeds of the winds especiallyat the lower altitudes which might lead to deduction in the wind turbines and will lead to over improvement of the efficiency. A vital step can be taken by the wind power in the field of renewable source for production of energy. The current status of wind energy is promising. The fourth edition of Global Wind Energy Outlook claimed that the wind energy constitutes 3.5% of global electricity production. The share in power generation is estimated to reach 12% by the year 2020 (Kuwahata, 2013). At the end of the year 2012, the total global production of the Wind Energy was 282 Giga Watts showing an increase of 44% from the year 2011 (Kuwahata, 2013). The installation of wind energy had reached its peak during the year 2012, but after the same year, the total production of wind power generation has decreased due to several reasons. In fact, the installation of wind energy for electricity generation falls to 18.7% which is the lowest in the past two decades. The United States has also gained the global momentum, and the growth rate in the country was estimated to be around 27.9% during the year 2012. The total electricity produced inthe United States from wind energy was 140 terawatt-hours constituting the 3.5% of the total
5energy produced from entire sources (Armentrout & Armentrout, 2009). The US Department of Energy (DOE) has accelerated its efforts to install wind and water power generation capability ofthe country. The DOE also issues loans and guarantees to install wind electricity generation. TheDOE has estimated to supply 20% energy from the wind generation by the year 2030 (Armentrout, 2009).Adoption of Wind EnergyThe main concerns for adoption and investments in the renewable energy technologies along with agreeing to the implementation policies for their support include environmental, security and economic concerns. The primary objectives for the adoption of wind energy on the global scale include the reduced risk from rising and volatile energy costs, energy security and decreased carbon emissions and other pollutants. One of the primary reasons for the adoption of wind energy worldwide is the fact that it is a highly environment-friendly source of energy. It is also estimated that in future conventional sources of energy such as fossil fuels might run out. The world has to look for alternate sources of energy to meet the energy demands of the future generations (Crossley, 2000).The most important factor towards the adoption of the Wind Energy as energy production source as it is the cleanest forms of energy. The use of wind power as a source of power ensures that there is no emission of carbon dioxide and other harmful gasses into the atmosphere and thusit is safer to use as compared to fossil fuels and nuclear power stations. The main concern, however, is to increase the output and efficiency of wind energy generation keep the costs under check.
6The wind power generation will be able to meet the increasing demand of the energy felt worldwide. The adoption of wind power can be beneficial in enhancing the diversity in the supply market of the energy and help in securing long-term sustainable supplies of the energy. The emission of local and global atmospheric emissions will be reduced. Furthermore, in order tomeet the specific demands of the energy services new commercially attractive options would be available along with creating tremendous job opportunities. The production of renewable energy especially from the sustainable natural sources is seen to contribute to the sustainable development and considers the needs of the future generation. Wind power will promise out to be the best alternative and the most suitable supplement towards the traditional energy sources especially in the developing countries. According to the studies, wind energy has made the considerable amount of contribution to the field of grid power installed capacity and can easily emerge out to be one of the options for mitigating pollution (Dincer, I., 2000). Due to wind power being environmental friendly and renewable in nature, wind energy can be converted to electricity. Wind Power and AugmentationThe primary challenge being faced by the urban wind energy is the lower mean speed of the wind especially in the urban environment owning to the increased roughness in the surface of thefree streams and reduction in the heights of the wind turbines on being installed. The incoming wind is seen to encounter higher turbulence intensity which is seen to be next to the lower mean wind speed. However, the harvesting of the wind turbines can take place in the well sited acceleration of the flows. This can result in over 70 percent of the increase in power. The wind turbines and its performance can be increased using a plethora of methods. According to Phillips (2003), a myriad of research has been performed in the field of power

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