Wind Power

Wind Power Overview

• Presenter: Anoop Desai

• Topic: Wind Power

Introduction to Wind Power

• The Earth's atmosphere serves as a reservoir for solar radiation.

• Wind is continuously regenerated in the atmosphere through the conversion of solar radiation into kinetic energy.

• Winds can be categorized into local and regional types.

• It is estimated that the average power available from shifting air masses across the Earth is approximately 1.8 imes 10^{15} Watts.

• The availability of wind power at any given location is contingent upon the topographical features of that location.

Interaction of Wind with the Earth's Surface

• The Earth's surface presents resistance to wind flow, which results in a decrease in wind power density.

Historical Context of Wind Power

• The utilization of wind power dates back thousands of years.

  • It was historically employed for applications such as grinding grain and pumping water.

• Wind power technology can turn vanes, blades, or propellers that are attached to a shaft.

• The revolving shaft connected to the rotor of a generator produces electricity.

Wind Power Generation

Wind Turbine Structure

• Three Blade Turbine: Shows a standard design for wind turbines.

Components of a Wind Turbine

• Working Mechanism:

  1. Inflow of wind activates the rotor (A) and blades (B).

  2. The rotor and blades spin the main shaft (C) and gearbox (D).

  3. The gearbox then spins the generator (G), resulting in electric power output.

Recent Developments in Wind Energy Technology

• Over the past two decades, wind energy technology has significantly evolved, allowing it to compete with most traditional energy generation methods.

• In 2004, the wind power generating capacity had a remarkable growth of 26%, surpassing 40,000 Mega-Watts (MW) for the first time.

• Innovations in turbine technology have led to:

  • Increased lifespan of wind turbines.

  • Enhanced performance.

  • Reduced operational costs.

Global Wind Energy Generating Capacity

• Growth Overview:

  • The following timeline illustrates the global wind energy generating capacity in Mega-Watts (MW) from 1980 to 2007.

  • The capacity has shown significant growth, increasing from virtually zero to over 40,000 MW in the recent years as documented by the World Watch Institute.

Leading Countries in Wind Energy

• Global Installed Power by Country (as of end 2008):

  • United States: 20.8 GW

  • Germany: 19.8 GW

  • Spain: 13.9 GW

  • China: 10.1 GW

  • India: 8.0 GW

  • Italy: 3.1 GW

  • France: 2.8 GW

  • Britain: 2.7 GW

  • Denmark: 2.6 GW

  • Portugal: 2.0 GW

• Data sourced from the Global Wind Energy Council.

Economic Analysis of Wind Power

• Comparison of Energy Sources:

  • Cost of different energy generation methods (measured in cents/kilowatt-hour) as of 2007:

  • Solar (Concentrated PV): 20 cents

  • Wind: 12 cents

  • Binary Geothermal: 14 cents

  • Flash Geothermal: 16 cents

  • Hydro: 10 cents

  • The data is influenced by various economic factors, including initial investment and operational costs.

Wind Power Characteristics

• Wind Power is considered a continuous source of energy.

• It is also classified as a clean energy source with no emissions released into the atmosphere.

• Wind Power does not contribute to the thermal burden of the Earth.

Limitations and Environmental Considerations of Wind Power

• Wind Power Density:

  • The power density from wind varies and is typically low in most locations.

  • Wind velocity must generally exceed 7 miles per hour to be harnessed effectively.

• Environmental Effects:

  • Wind power may induce local environmental changes, dependent on the specific location and the number of wind power plants in operation.

  • Potential impacts include alterations to local climate and disruptions to bird migration patterns.

• Power Density Variation:

  • A challenge exists concerning the variability in wind power density and the duration over which it can be reliably generated.