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A screw turbine at a small hydro power plant in Goryn, Poland. The Archimedean screw is an ancient invention, attributed to Archimedes of Syracuse (287–212 BC.), and commonly used to raise water from a watercourse for irrigation purposes.
The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
Archimedes screw: Water is fed into the top of the screw forcing it to rotate. The rotating shaft can then be used to drive an electric generator. A gear box is required, since the rotational speed is very low. The screw is used at low heads (1.5–5 metres) and medium to high flows (1 to 20 m 3 /s). For higher flows, multiple screws are used.
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The 100 kW Archimedes' screw turbine supplied by Landustrie was the most economically feasible with feed-in-tariffs. [4] [5] Electricity is sold to the National Grid through a power purchase agreement. Surplus revenue is channelled into social and environmental initiatives and community enterprise projects.
The mill was built in the 15th century, and further extended in the 17th, 18th and 19th centuries. It is a Grade II* listed building and is preserved in an operational state. [1] [2] The mill also houses a micro hydro-electric power station, using a 3.6-metre (12 ft) Archimedes' screw turbine to generate electricity for sale to the National Grid.
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