Authors: H. S. Patil
Growing concern for the environment degradation has led to the world’s interest in renewable energy sources. Wind energy is rapidly emerging as one of the most cost-effective forms of renewable energy with very significant increases in annual installed capacity being reported around the world. The favoured form of turbines used for electricity generation purposes is the Horizontal Axis Wind Turbine (HAWT) with low solidity ratio (ratio of blade area to swept area) and high tip speed ratio, λ = ΩR/Vwind, where R is the radius of the blades and Vwind is the wind velocity. This type of turbine has a high efficiency or coefficient of performance (Cp), but relatively low torque. Wind energy is kinetic energy associated with the movement of atmospheric air. Wind energy systems for irrigation & milling have been in use since ancient times & since beginning of 20th century it is being used to generate electric power. Windmills for water pumping have been installed in many countries particularly in the rural areas. Wind turbines transform the energy in the wind into mechanical power, which can then be used directly for grinding etc. or further converting to electric power to generate electricity. Wind turbines can be used singly or in clusters called ‘wind farms’. Small wind turbines called aero-generators can be used to charge large batteries. Five nations –Germany, USA, Denmark, Spain & India account for 80% of the worlds installed wind energy capacity. Wind energy continues to be fastest growing renewable energy source with worldwide wind power installed capacity. India ranks 5th in the world with a largest wind power capacities which have been established in commercial projects. In India the states Tamilnadu & Gujarat lead in the field of wind energy. There about a dozen wind pumps of various designs providing water for agriculture & domestic purposes all scattered over the country. Today India is a major player in global wind energy market. The present work was originally devised as a student project to examine the possibility of developing a small scale, high torque, self-starting HAWT for applications such as water pumping. In the following we outline the development of the concept of the PVC type HAWT, the development of a experimental setup of the device that includes the design, manufacture, commissioning and preliminary testing of the device
Comments: 11 Pages.
[v1] 2012-08-19 10:43:49
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