Wind Energy

Wind Energy

• Wind energy is kinetic energy of moving air. The uneven absorption of solar radiation by earth's surface causes differences of temperature, density and pressure which produce air movements.

• Wind power is a function of wind, speed. Wind speed increases with height on earth.

1. Methods of Harnessing Wind Energy

• The wind energy can be harnessed by using wind mills.

1. Wind mills

• The wind mill structure consists of huge rotating blades mounted on a tower. The blowing wind strikes on blades of wind mill making it to rotate continuously.

• The blades are linked to gear box and AC generator, which can drive number of machines like water pump, heater etc.

2. Advantages of Wind Energy

1. The entire process of wind power is non-polluting.

2. Wind energy is one of the sustainable source of energy.

3. Wind energy is renewable.

4. Wind energy is available at free of cost.

5. Suitable for remote locations.

3. Disadvantages of Wind Energy

1. Wind is an intermittent source, and the intermittence depends on geographic distribution of wind. Therefore, it can not be used as sole resource of electricity and requires backup or storage system.

2. Storage technology is not fully developed.

3. Damage of local environment by deforestation and hence loss of biodiversity.

4. Birds may get killed.

5. Noise pollution in local area may affect TV reception.

4. Comparison of Solar and Wind Energy

Review Question

1. Discuss the advantages and disadvantages of wind energy.