Selection of Site for Windmill & Construction of Windmill


How Wind Forms :


     The earth's surface has both land and water. When the sun rises, the air over the land gets heated up faster when compared to air over the water ( oceans ). As the temperature of the air increases it becomes more lighter in density. Now the air over the water ( has more density ) starts moving toward the land and air over the land move toward the water. At night the processes will be reverse, i.e., air over the water is warmer and rises, and is replaced by cooler air from land.


     The moving air ( wind ) has huge amounts of kinetic energy, end this can be transferred into electrical energy using wind turbines. The force generated by wind turns the turbine blades, which rotates the shaft coupled to it, which connects to a generator and which generates electricity. The electricity generated is transmitted through transmission and distribution lines to a substation, then on to load centers ( homes, offices, schools, etc ).


     The dis-advantage of wind power is no electrical energy is generated if no certain amount of force of the wind. Wind turbines are usually located on high hills and mountain ridges where we can get sufficient flow of wind energy.



Selection of Site for Wind Mill :


1. Turbines work at the best when on high, exposed sites. Coastal sites are especially good.

2. The site must have good wind flow ( 10 to 25 years of data must be checked ) data.

3. Site must allow strong foundation.

4. Better to avoid private land.

5. Better to locate away from the Town centers and highly populated residential areas.

6. Avoid roof mounted turbines as there is no guarantee that these devices will not damage the building through vibrations.

7. The distance between the wind mill and the load should be less.

8. Distance between the wind mill and the nearest building / trees must be at least 30 m.

9. Smaller turbines require an average wind speed of over 4.5 m / s to produce an efficient level of electricity.

10. Planning permission before you can install your wind turbine.

11. If the  location is next to a listed building, in a conservation area, or in an area of natural beauty ( AONB ), planning permission problems arise, so contact your local authority at the very early stages of the project to avoid disappointment.



Construction of Wind Mill :


     Most modern windmills ( some people call them wind turbines ) have three blades. A number of variations have been tried, two blades, even one blade but three blades works the best, it's won the evolutionary battle so to speak.


     And most modern windmills rotate clockwise. We don't think there's any particular reason for that and there have been some that rotate the other way.

Selection of Site for Windmill & Construction of Windmill

     The blades of a windmill are aerodynamically optimized to make the most of the energy in the wind and turn it into rotational energy making the blades spin round.


     These blades are connected to a  generator, sometimes through a gearbox ( in what's known as 'fixed speed' machines ) and sometimes connected directly ( in what are known as 'variable speed' or 'direct drive' machines ) in both cases the generator converts the mechanical energy ( the rotation of the blades ) into electrical energy.


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