Fatih increased the hike.
windmills was increasingly widespread in Europe from the 12th century until the early 19th century. Their slow decline, because of the development of steam power, lasted for a further 100 years. Their rapid demise began following World War I with the development of the internal-combustion engine and the spread of electric power; from that time on, however, electrical generation by wind power has served as the subject of more and more experiments
"The wind power sector, which accounts for 10% of the country's power intensity, added over 10,500 capacity (MW) in total,"
Separately, Turkish Wind Energy Association (TÜREB) Chairperson Ebru Arıcı said Turkey will add around 1,500 megawatts of wind energy power to the national grid next year.The next development was to place the stones and gearing in a fixed tower. This has a movable top, or cap, which carries the sails and can be turned around on a track, or curb, on top of the tower. The earliest-known illustration of a tower mill is dated about 1420. Both post and tower mills were to be found throughout Europe and were also built by settlers in America.
To work efficiently, the sails of a windmill must face squarely into the wind, and in the early mills the turning of the post-mill body, or the tower-mill cap, was done by hand by means of a long tailpole stretching down to the ground. In 1745 Edmund Lee in England invented the automatic fantail. This consists of a set of five to eight smaller vanes mounted on the tailpole or the ladder of a post mill at right angles to the sails and connected by gearing to wheels running on a track around the mill. When the wind veers it strikes the sides of the vanes, turns them and hence the track wheels also, which turn the mill body until the sails are again square into the wind. The fantail may also be fitted to the caps of tower mills, driving down to a geared rack on the curb.
The sails of a mill are mounted on an axle, or windshaft, inclined upward at an angle of from 5° to 15° to the horizontal. The first mill sails were wooden frames on which sailcloth was spread; each sail was set individually with the mill at rest. The early sails were flat planes inclined at a constant angle to the direction of rotation; later they were built with a twist like that of an airplane propeller.
In 1772 Andrew Meikle, a Scot, invented his spring sail, substituting hinged shutters, like those of a Venetian blind, for sailcloths and controlling them by a connecting bar and a spring on each sail. Each spring had to be adjusted individually with the mill at rest according to the power required; the sails were then, within limits, self-regulating.
In 1789 Stephen Hooper in England utilized roller blinds instead of shutters and devised a remote control to enable all the blinds to be adjusted simultaneously while the mill was at work. In 1807 Sir William Cubitt invented his “patent sail” combining Meikle’s hinged shutters with Hooper’s remote control by chain from the ground via a rod passing through a hole drilled through the windshaft; the operation was comparable to operating an umbrella; by varying the weights hung on the chain the sails were made self-regulating.
The annular-sailed wind pump was brought out in the United States by Daniel Hallady in 1854, and its production in steel by Stuart Perry in 1883 led to worldwide adoption, for, although inefficient, it was cheap and reliable. The design consists of a number of small vanes set radially in a wheel. Governing is automatic: of yaw by tail vane, and of torque by setting the wheel off-centre with respect to the vertical yaw axis. Thus, as the wind increases the mill turns on its vertical axis, reducing the effective area and therefore the speed.
The most important use of the windmill was for grinding grain. In certain areas its uses in land drainage and water pumping were equally important. The windmill has been used as a source of electrical power since P. La Cour’s mill, built in Denmark in 1890 with patent sails and twin fantails on a steel tower. Interest in the use of windmills for the generation of electric power, on both single-user and commercial scales, revived in the 1970s
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