2. A]Enumerate the method of extracting energy from Wind with a neat sketch.
Answer:
Wind Power:
- Wind energy is defined as the kinetic energy associated with the moment of large mass of air over the earth surface. The circulation of air is caused by the uneven heating and cooling of the earth surface. In general, during the daytime the land masses heated up faster than sea hence air moving over the land masses heated up and becomes less dense. This makes the cold denser air from the sea blow towards the land masses.
- But during the night, the land cools faster than the sea and hence, the denser air from the landmasses starts moving towards the sea. That is offshore.
- Above figure shows the schematic arrangement of windmill. The major parts of a windmill are hub, blades, nasal, tail, yawing mechanism and tower.
working principle: - As the wind flows over the windmill, the blades of the mill start rotating slowly. Blade starts rotated because of their aerodynamic profile. The wings are connected to hub, which is in turn connected to main driving shaft, which is intern connected to gearbox. The function of the gearbox is to increase the speed of the shaft which is connected to the generator. The generator, generates the power and transmitted to grid. The minimum velocity in air required to run the windmill is more than five meter per second.
