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For the ancient windmills, the following indicative values of η can be assumed: Vertical axis windmill: η = 0.1; Cretan windmill: η = 0.25; traditional mill: η = 0.25 to 0.3. Therefore, considering that a Cretan windmill has a 6 m diameter rotor, the powers will be roughly developed depending on the wind speed, as reported in Table 1.
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It was discovered that this type of windmill was oldest one, created in Eastern Persia between 7th and 8th century AD. Limited number of them was also used in China and Europe. Vertical windmills – Most popular type of windmills that …
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The use of windmills became widespread across the Middle East and Central Asia, and later spread to China and India. Vertical windmills were later used extensively in Northwestern Europe to grind flour beginning in the …
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Vertical-axis windmills were also used in China, which is often claimed as their birthplace. While the belief that the windmill was invented in China more than 2000 years ago is widespread and may be accurate, the earliest actual documentation of a Chinese windmill was in 1219 A.D. by the Chinese statesman Yehlu Chhu-Tshai.
[18] [19] Such windmills were in widespread use across the Middle East and Central Asia and later spread to Europe, China, and India from there. [20] By the 11th century, the vertical-axle windmill had reached parts of Southern Europe, including the Iberian Peninsula (via Al-Andalus) and the Aegean Sea (in the Balkans). [21]
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This is a windmill with a vertical axis. Only a handful of them still stand. Harnessing the wind. After taking the Muslim world by storm, windmills made their way to other parts of Asia and Europe in the 12th century. ... Windmills started popping up in China, Africa, and Europe. Inventors modified them into different shapes, sizes, and designs ...
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These were horizontal windmills with long vertical driveshaft with six to twelve rectangular sails covered in reed matting or cloth, and they were used at homes as well as in grist milling and sugarcane industries. The use of windmills became widespread across the Middle East and Central Asia, and later spread to China, India and the rest of ...
