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Windpump

A windpump is a type of windmill which is used for pumping water.

The windmills at Kinderdijk in the village of Kinderdijk, Netherlands is a UNESCO World Heritage Site
De Olifant at Burdaard, Friesland

Windpumps were used to pump water since at least the 9th century in what is now Afghanistan, Iran and Pakistan.[1] The use of wind pumps became widespread across the Muslim world and later spread to China and India.[2] Windmills were later used extensively in Europe, particularly in the Netherlands and the East Anglia area of Great Britain, from the late Middle Ages onwards, to drain land for agricultural or building purposes.

Simon Stevin's work in the waterstaet involved improvements to the sluices and spillways to control flooding. Windmills were already in use to pump the water out, but in Van de Molens (On mills), he suggested improvements, including the idea that the wheels should move slowly, and a better system for meshing of the gear teeth. These improvements increased the efficiency of the windmills used to pump water out of the polders by three times. He received a patent on his innovation in 1586.[3]

Eight- to ten-bladed windmills were used in the Region of Murcia, Spain, to raise water for irrigation purposes.[4] The drive from the windmill's rotor was led down through the tower and back out through the wall to turn a large wheel known as a noria. The noria supported a bucket chain which dangled down into the well. The buckets were traditionally made of wood or clay. These windmills remained in use until the 1950s, and many of the towers are still standing.

Early immigrants to the New World brought with them the technology of windmills from Europe.[5] On US farms, particularly on the Great Plains, wind pumps were used to pump water from farm wells for cattle. In California and some other states, the windmill was part of a self-contained domestic water system, including a hand-dug well and a redwood water tower supporting a redwood tank and enclosed by redwood siding (tankhouse). The self-regulating farm wind pump was invented by Daniel Halladay in 1854.[5][6] Eventually, steel blades and steel towers replaced wooden construction, and at their peak in 1930, an estimated 600,000 units were in use, with capacity equivalent to 150 megawatts.[7] Very large lighter wind pumps in Australia directly crank the pump with the rotor of the windmill. Extra back gearing between small rotors for high wind areas and the pump crank prevents trying to push the pump rods down on the downstroke faster than they can fall by gravity. Otherwise pumping too fast leads to the pump rods buckling, making the seal of the stuffing box leak and wearing through the wall of the rising main (UK) or the drop-pipe (US) so all output is lost.

The multi-bladed wind pump or wind turbine atop a lattice tower made of wood or steel hence became, for many years, a fixture of the landscape throughout rural America.[8] These mills, made by a variety of manufacturers, featured many blades so that they would turn slowly with considerable torque in moderate winds and be self-regulating in high winds. A tower-top gearbox and crankshaft converted the rotary motion into reciprocating strokes carried downward through a rod to the pump cylinder below. Today, rising energy costs and improved pumping technology are increasing interest in the use of this once declining technology.

Worldwide use

 
A working wooden windpump on The Fens in Cambridgeshire, UK

The Netherlands is well known for its windmills. Most of these iconic structures situated along the edge of polders are actually windpumps, designed to drain the land. These are particularly important as much of the country lies below sea level.

In the UK, the term windpump is rarely used, and they are better known as drainage windmills. Many of these were built in The Broads and The Fens of East Anglia for the draining of land, but most of them have since been replaced by diesel or electric powered pumps.[9] Many of the original windmills still stand in a derelict state although some have been restored.[citation needed]

Windpumps are used extensively in Southern Africa, Australia, and on farms and ranches in the central plains and Southwest of the United States. In South Africa and Namibia thousands of windpumps are still operating. These are mostly used to provide water for human use as well as drinking water for large sheep stocks.

Kenya has also benefited from the African development of windpump technologies. At the end of the 1970s, the UK NGO Intermediate Technology Development Group provided engineering support to the Kenyan company Bobs Harries Engineering Ltd for the development of the Kijito windpumps. Bobs Harries Engineering Ltd is still manufacturing the Kijito windpumps, and more than 300 of them are operating in the whole of East Africa.[citation needed]

In many parts of the world, a rope pump is being used in conjunction with wind turbines. This easy-to- construct pump works by pulling a knotted rope through a pipe (usually a simple PVC pipe) causing the water to be pulled up into the pipe. This type of pump has become common in Nicaragua and other places.[citation needed]

Construction

To construct a windpump, the bladed rotor needs to be matched to the pump. With non-electric windpumps, high solidity rotors are best used in conjunction with positive displacement (piston) pumps, because single-acting piston pumps need about three times as much torque to start them as to keep them going. Low solidity rotors, on the other hand, are best used with centrifugal pumps, waterladder pumps and chain and washer pumps, where the torque needed by the pump for starting is less than that needed for running at design speed. Low solidity rotors are best used if they are intended to drive an electricity generator; which in turn can drive the pump.[10]

Multi-bladed windpumps

 
Wind powered water pump on Oak Park Farm, Shedd, Oregon.
 
Windpump in far western NSW.

Multi-bladed wind pumps can be found worldwide and are manufactured in the United States, Argentina, China, New Zealand, South Africa, and Australia. Commonly known in the US and Canada as a "weathercock" because it behaves much like a traditional weather vane, moving with the direction of the wind (but also measuring wind speed).The Butler brand added improvements to the technology of windpumps in 1897, 1898 and 1905[11] A 16 ft (4.8 m) diameter wind pump can lift up to 1600 US gallons (about 6.4 metric tons) of water per hour to an elevation of 100 ft with a 15 to 20 mph wind (24–32 km/h).[12] However they take a strong wind to start so they turn over the crank of the piston pump. Wind pumps require little maintenance—usually only a change of gear box oil annually.[13] An estimated 60,000 wind pumps are still in use in the United States. They are particularly attractive for use at remote sites where electric power is not available and maintenance is difficult to provide.[14] A common multi-bladed windpump usefully pumps with about 4%–8% of the annual windpower passing through the area it sweeps[15][16] This lower conversion is due to poor load matching between wind rotors and fixed-stroke piston pumps.

Fundamental problems of multi-bladed windpumps

Inefficient rotor

 
Derelict water tank with windmill in the background

The main design feature of a multi-bladed rotor is "high starting torque", which is necessary for cranking a piston pump operation. Once started a multi-bladed rotor runs at too high a tipspeed ratio at less than its best efficiency of 30%.[17] On the other hand, modern wind rotors can operate at an aerodynamic efficiency of more than 40% at higher tipspeed ratio for a smaller swirl added and wasted to the wind.[17] But they would need a highly variable stroke mechanism rather than just a crank to piston pump.[citation needed]

Poor load matching

A multi-bladed windmill is a mechanical device with a piston pump. Because a piston pump has a fixed stroke, the energy demand of this type of pump is proportional to pump speed only. On the other hand, the energy supply of a wind rotor is proportional to the cube of wind speed. Because of that, a wind rotor runs at over speed (more speed than needed), yielding a loss of aerodynamic efficiency.

A variable stroke would match the rotor speed according to wind speed, functioning like a "variable-speed generator". The flow rate of variable stroke windpump can be increased two times, compared to fixed stroke windpumps at the same wind speed.[18]

Cyclic torque variation

A piston pump has a very light suction phase, but the upstroke is heavy and puts a big backtorque on a starting rotor when the crank is horizontal and ascending. A counterweight on the crank up in the tower and yawing with the wind direction can at least spread the torque to the crank descent.[citation needed]

Development of improved windpumps

 
Windmill patent drawing from 1889 vintage aged
 
Aldrich windmill patent drawing from 1889

Although multi-bladed windpumps are based on proven technology and are widely used, they have the fundamental problems mentioned above and need a practical variable stroke mechanism.[citation needed]

USDA experiments at Texas

Between 1988 and 1990, a variable stroke windpump was tested at the USDA-Agriculture Research Center-Texas, based on two patented designs (Don E. Avery Patent #4.392.785, 1983 and Elmo G. Harris Patent #617.877, 1899).[18] Control systems of the variable stroke wind pumps were mechanical and hydraulic; however, those experiments did not attract the attention of any windpump manufacturer. After experiments with this variable stroke windpump, research focused on wind-electric water pumping systems; no commercial variable stroke windpump exists yet.[citation needed]

Fluttering windpumps

Fluttering windpumps have been developed in Canada with a pump stroke varying strongly with amplitude to absorb all the variable power in the wind and to stop the uniblade from swinging too far beyond horizontal from its vertical mean position. They are much lighter and use less material than multiblade windpumps and can pump effectively in lighter wind regimes.[19][20]

Variable stroke windpump

A Turkish engineer re-designed the variable stroke windpump technology by using modern electronic control equipment. Research began in 2004, with governmental R&D support. The first commercial new generation variable stroke wind pumps have been designed after ten years of R&D. The 30 kW variable stroke windpump design includes a Darrieus-type modern wind rotor, counterbalance and regenerative brake technology.[21]

Vertical axis wind pump (VAWP)

Using a vertical axis wind turbine, the redirection of the turbine torque from horizontal to the vertical axis can be solved, thus creating a basic shaft connection between the turbine and the pump.[22] The direct connection can produce a more efficient wind-pump. for example, Combining the VAWP system with a high-pressure (HP-VAWP) drip irrigation system can lead, with proper optimization, to two to three times higher efficiency than traditional windpumps.[23]

Combinations

Tjasker

 
The tjasker

In the Netherlands, the tjasker is a drainage mill with common sails connected to an Archimedean screw. This is used for pumping water in areas where only a small lift is required. The windshaft sits on a tripod which allows it to pivot. The Archimedean screw lifts water into a collecting ring, where it is drawn off into a ditch at a higher level, thus draining the land.[24]

Thai windpumps

In Thailand, windpumps are traditionally built on Chinese windpump designs. These pumps are constructed from wire-braced bamboo poles carrying fabric or bamboo-mat sails; a paddle pump or waterladder pump is fixed to a Thai bladed rotor. They are mainly used in salt pans where the water lift required is typically less than one meter.[25]

See also

References

  1. ^ Lucas, Adam (2006). Wind, Water, Work: Ancient and Medieval Milling Technology. Brill Publishers. p. 61. ISBN 90-04-14649-0.
  2. ^ . swipnet.se. Archived from the original on May 24, 2007. Retrieved August 20, 2021.
  3. ^ Sarton, George (1934). "Simon Stevin of Bruges (1548-1620)". Isis. 21 (2): 241–303. doi:10.1086/346851. S2CID 144054163.
  4. ^ Schinas, Jill (2008). "Spanish Water Works". yachtmollymawk.com. Retrieved August 20, 2021.
  5. ^ a b Baker, T. Lindsay. . windmillersgazette.com. Archived from the original on October 7, 2011. Retrieved August 20, 2021.
  6. ^ Clements, Elizabeth (2003). "Historic Turns in The Windmill City". Fermi News. Fermilab. 26 (3). Retrieved August 20, 2021.
  7. ^ Gipe, Paul (1995). Wind Energy Comes of Age. John Wiley and Sons. pp. 123–127. ISBN 0-471-10924-X.
  8. ^ Duval, George (July 18, 2021). "Wind Turbines vs. Windmills: What's the Difference?". semprius.com. Retrieved August 20, 2021.
  9. ^ Williamson, Tom (1997). The Norfolk Broads: A Landscape History. Manchester University Press. p. 106. ISBN 9780719048005.
  10. ^ Water lifting devices; matching bladed rotors to pumps
  11. ^ "Butler Pictorial" (PDF). Retrieved 2023-07-30.
  12. ^ Iron Man Windmill Website pumping capacity calculator, retrieved January 15, 2011
  13. ^ Aermotor Web site frequently asked questions, retrieved Sept. 17, 2008
  14. ^ "Windmill parts".
  15. ^ Argaw, N.,"Renewable Energy for Water Pumping Applications in Rural Villages",2003, NREL Report 30361, page 27
  16. ^ Brian Vick, Nolan Clark "Performance and Economic Comparison of a Mechanical Windmill to Wind-Electric Water Pumping System", 1997, USDA-Agricultural Research Service, see Figure-2
  17. ^ a b Hau, Erich "Wind Turbines", 2005, page 101, Fig.5-10
  18. ^ a b
  19. ^ "Econologica".
  20. ^ Archived at Ghostarchive and the : "WING'D MILLS 2013: FLO'Pump and FLUTTER WELL Pump". YouTube.
  21. ^ ENA Yelkapan Technologies Ltd.
  22. ^ Hagen, L. J., and Sharif, M., 1981, “Darrieus Wind Turbine and Pump Performance for Low-Lift Irrigation Pumping,” U.S. Department of Agriculture, Manhattan, KS, Report No. DOE/ARS-3707-20741/81/1.
  23. ^ "Keisar, D., Eilan, B., and Greenblatt, D. (February 8, 2021). "High Pressure Vertical Axis Wind Pump." ASME. J. Fluids Eng. May 2021; 143(5): 051204".
  24. ^ "The types of windmills". Odur. Retrieved 2008-05-24.
  25. ^ Smulders, P.T. (January 1996). "Wind water pumping: the forgotten option" (PDF). Energy for Sustainable Development. 11 (5).
  26. ^ Coil pump frequently used for windpump construction

External links

  • A detailed photographic record of the restoration of an 8' Stewarts & Lloyds windpump in South Africa
  • History of the Water Pumping Windmill in America.
  • How Water Pumping Windmills work.

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A windpump is a type of windmill which is used for pumping water The windmills at Kinderdijk in the village of Kinderdijk Netherlands is a UNESCO World Heritage SiteDe Olifant at Burdaard FrieslandWindpumps were used to pump water since at least the 9th century in what is now Afghanistan Iran and Pakistan 1 The use of wind pumps became widespread across the Muslim world and later spread to China and India 2 Windmills were later used extensively in Europe particularly in the Netherlands and the East Anglia area of Great Britain from the late Middle Ages onwards to drain land for agricultural or building purposes Simon Stevin s work in the waterstaet involved improvements to the sluices and spillways to control flooding Windmills were already in use to pump the water out but in Van de Molens On mills he suggested improvements including the idea that the wheels should move slowly and a better system for meshing of the gear teeth These improvements increased the efficiency of the windmills used to pump water out of the polders by three times He received a patent on his innovation in 1586 3 Eight to ten bladed windmills were used in the Region of Murcia Spain to raise water for irrigation purposes 4 The drive from the windmill s rotor was led down through the tower and back out through the wall to turn a large wheel known as a noria The noria supported a bucket chain which dangled down into the well The buckets were traditionally made of wood or clay These windmills remained in use until the 1950s and many of the towers are still standing Early immigrants to the New World brought with them the technology of windmills from Europe 5 On US farms particularly on the Great Plains wind pumps were used to pump water from farm wells for cattle In California and some other states the windmill was part of a self contained domestic water system including a hand dug well and a redwood water tower supporting a redwood tank and enclosed by redwood siding tankhouse The self regulating farm wind pump was invented by Daniel Halladay in 1854 5 6 Eventually steel blades and steel towers replaced wooden construction and at their peak in 1930 an estimated 600 000 units were in use with capacity equivalent to 150 megawatts 7 Very large lighter wind pumps in Australia directly crank the pump with the rotor of the windmill Extra back gearing between small rotors for high wind areas and the pump crank prevents trying to push the pump rods down on the downstroke faster than they can fall by gravity Otherwise pumping too fast leads to the pump rods buckling making the seal of the stuffing box leak and wearing through the wall of the rising main UK or the drop pipe US so all output is lost The multi bladed wind pump or wind turbine atop a lattice tower made of wood or steel hence became for many years a fixture of the landscape throughout rural America 8 These mills made by a variety of manufacturers featured many blades so that they would turn slowly with considerable torque in moderate winds and be self regulating in high winds A tower top gearbox and crankshaft converted the rotary motion into reciprocating strokes carried downward through a rod to the pump cylinder below Today rising energy costs and improved pumping technology are increasing interest in the use of this once declining technology Contents 1 Worldwide use 2 Construction 3 Multi bladed windpumps 4 Fundamental problems of multi bladed windpumps 4 1 Inefficient rotor 4 2 Poor load matching 4 3 Cyclic torque variation 5 Development of improved windpumps 5 1 USDA experiments at Texas 5 2 Fluttering windpumps 5 3 Variable stroke windpump 5 4 Vertical axis wind pump VAWP 6 Combinations 6 1 Tjasker 6 2 Thai windpumps 7 See also 8 References 9 External linksWorldwide use Edit A working wooden windpump on The Fens in Cambridgeshire UKThe Netherlands is well known for its windmills Most of these iconic structures situated along the edge of polders are actually windpumps designed to drain the land These are particularly important as much of the country lies below sea level In the UK the term windpump is rarely used and they are better known as drainage windmills Many of these were built in The Broads and The Fens of East Anglia for the draining of land but most of them have since been replaced by diesel or electric powered pumps 9 Many of the original windmills still stand in a derelict state although some have been restored citation needed Windpumps are used extensively in Southern Africa Australia and on farms and ranches in the central plains and Southwest of the United States In South Africa and Namibia thousands of windpumps are still operating These are mostly used to provide water for human use as well as drinking water for large sheep stocks Kenya has also benefited from the African development of windpump technologies At the end of the 1970s the UK NGO Intermediate Technology Development Group provided engineering support to the Kenyan company Bobs Harries Engineering Ltd for the development of the Kijito windpumps Bobs Harries Engineering Ltd is still manufacturing the Kijito windpumps and more than 300 of them are operating in the whole of East Africa citation needed In many parts of the world a rope pump is being used in conjunction with wind turbines This easy to construct pump works by pulling a knotted rope through a pipe usually a simple PVC pipe causing the water to be pulled up into the pipe This type of pump has become common in Nicaragua and other places citation needed Construction EditTo construct a windpump the bladed rotor needs to be matched to the pump With non electric windpumps high solidity rotors are best used in conjunction with positive displacement piston pumps because single acting piston pumps need about three times as much torque to start them as to keep them going Low solidity rotors on the other hand are best used with centrifugal pumps waterladder pumps and chain and washer pumps where the torque needed by the pump for starting is less than that needed for running at design speed Low solidity rotors are best used if they are intended to drive an electricity generator which in turn can drive the pump 10 Multi bladed windpumps Edit Wind powered water pump on Oak Park Farm Shedd Oregon Windpump in far western NSW Multi bladed wind pumps can be found worldwide and are manufactured in the United States Argentina China New Zealand South Africa and Australia Commonly known in the US and Canada as a weathercock because it behaves much like a traditional weather vane moving with the direction of the wind but also measuring wind speed The Butler brand added improvements to the technology of windpumps in 1897 1898 and 1905 11 A 16 ft 4 8 m diameter wind pump can lift up to 1600 US gallons about 6 4 metric tons of water per hour to an elevation of 100 ft with a 15 to 20 mph wind 24 32 km h 12 However they take a strong wind to start so they turn over the crank of the piston pump Wind pumps require little maintenance usually only a change of gear box oil annually 13 An estimated 60 000 wind pumps are still in use in the United States They are particularly attractive for use at remote sites where electric power is not available and maintenance is difficult to provide 14 A common multi bladed windpump usefully pumps with about 4 8 of the annual windpower passing through the area it sweeps 15 16 This lower conversion is due to poor load matching between wind rotors and fixed stroke piston pumps Fundamental problems of multi bladed windpumps EditInefficient rotor Edit Derelict water tank with windmill in the backgroundThe main design feature of a multi bladed rotor is high starting torque which is necessary for cranking a piston pump operation Once started a multi bladed rotor runs at too high a tipspeed ratio at less than its best efficiency of 30 17 On the other hand modern wind rotors can operate at an aerodynamic efficiency of more than 40 at higher tipspeed ratio for a smaller swirl added and wasted to the wind 17 But they would need a highly variable stroke mechanism rather than just a crank to piston pump citation needed Poor load matching Edit A multi bladed windmill is a mechanical device with a piston pump Because a piston pump has a fixed stroke the energy demand of this type of pump is proportional to pump speed only On the other hand the energy supply of a wind rotor is proportional to the cube of wind speed Because of that a wind rotor runs at over speed more speed than needed yielding a loss of aerodynamic efficiency A variable stroke would match the rotor speed according to wind speed functioning like a variable speed generator The flow rate of variable stroke windpump can be increased two times compared to fixed stroke windpumps at the same wind speed 18 Cyclic torque variation Edit A piston pump has a very light suction phase but the upstroke is heavy and puts a big backtorque on a starting rotor when the crank is horizontal and ascending A counterweight on the crank up in the tower and yawing with the wind direction can at least spread the torque to the crank descent citation needed Development of improved windpumps Edit Windmill patent drawing from 1889 vintage aged Aldrich windmill patent drawing from 1889Although multi bladed windpumps are based on proven technology and are widely used they have the fundamental problems mentioned above and need a practical variable stroke mechanism citation needed USDA experiments at Texas Edit Between 1988 and 1990 a variable stroke windpump was tested at the USDA Agriculture Research Center Texas based on two patented designs Don E Avery Patent 4 392 785 1983 and Elmo G Harris Patent 617 877 1899 18 Control systems of the variable stroke wind pumps were mechanical and hydraulic however those experiments did not attract the attention of any windpump manufacturer After experiments with this variable stroke windpump research focused on wind electric water pumping systems no commercial variable stroke windpump exists yet citation needed Fluttering windpumps Edit Fluttering windpumps have been developed in Canada with a pump stroke varying strongly with amplitude to absorb all the variable power in the wind and to stop the uniblade from swinging too far beyond horizontal from its vertical mean position They are much lighter and use less material than multiblade windpumps and can pump effectively in lighter wind regimes 19 20 Variable stroke windpump Edit A Turkish engineer re designed the variable stroke windpump technology by using modern electronic control equipment Research began in 2004 with governmental R amp D support The first commercial new generation variable stroke wind pumps have been designed after ten years of R amp D The 30 kW variable stroke windpump design includes a Darrieus type modern wind rotor counterbalance and regenerative brake technology 21 Vertical axis wind pump VAWP Edit Using a vertical axis wind turbine the redirection of the turbine torque from horizontal to the vertical axis can be solved thus creating a basic shaft connection between the turbine and the pump 22 The direct connection can produce a more efficient wind pump for example Combining the VAWP system with a high pressure HP VAWP drip irrigation system can lead with proper optimization to two to three times higher efficiency than traditional windpumps 23 Combinations EditTjasker Edit Main article tjasker The tjaskerIn the Netherlands the tjasker is a drainage mill with common sails connected to an Archimedean screw This is used for pumping water in areas where only a small lift is required The windshaft sits on a tripod which allows it to pivot The Archimedean screw lifts water into a collecting ring where it is drawn off into a ditch at a higher level thus draining the land 24 Thai windpumps Edit In Thailand windpumps are traditionally built on Chinese windpump designs These pumps are constructed from wire braced bamboo poles carrying fabric or bamboo mat sails a paddle pump or waterladder pump is fixed to a Thai bladed rotor They are mainly used in salt pans where the water lift required is typically less than one meter 25 See also EditAermotor Windmill Company an American windpump manufacturer Blade solidity Coil pump another frequently used pump 26 Loeriesfontein Northern Cape where there is a museum dedicated to water pumping windmills Tjasker on Dutch Wikipedia Wind turbine Zaanse SchansReferences Edit Lucas Adam 2006 Wind Water Work Ancient and Medieval Milling Technology Brill Publishers p 61 ISBN 90 04 14649 0 History of Sciences in the Islamic World swipnet se Archived from the original on May 24 2007 Retrieved August 20 2021 Sarton George 1934 Simon Stevin of Bruges 1548 1620 Isis 21 2 241 303 doi 10 1086 346851 S2CID 144054163 Schinas Jill 2008 Spanish Water Works yachtmollymawk com Retrieved August 20 2021 a b Baker T Lindsay Brief History of Windmills in the New World windmillersgazette com Archived from the original on October 7 2011 Retrieved August 20 2021 Clements Elizabeth 2003 Historic Turns in The Windmill City Fermi News Fermilab 26 3 Retrieved August 20 2021 Gipe Paul 1995 Wind Energy Comes of Age John Wiley and Sons pp 123 127 ISBN 0 471 10924 X Duval George July 18 2021 Wind Turbines vs Windmills What s the Difference semprius com Retrieved August 20 2021 Williamson Tom 1997 The Norfolk Broads A Landscape History Manchester University Press p 106 ISBN 9780719048005 Water lifting devices matching bladed rotors to pumps Butler Pictorial PDF Retrieved 2023 07 30 Iron Man Windmill Website pumping capacity calculator retrieved January 15 2011 Aermotor Web site frequently asked questions retrieved Sept 17 2008 Windmill parts Argaw N Renewable Energy for Water Pumping Applications in Rural Villages 2003 NREL Report 30361 page 27 Brian Vick Nolan Clark Performance and Economic Comparison of a Mechanical Windmill to Wind Electric Water Pumping System 1997 USDA Agricultural Research Service see Figure 2 a b Hau Erich Wind Turbines 2005 page 101 Fig 5 10 a b Clark Nolan Variable Stroke Pumping for Mechanical Windmills 1990 AWEA Proceedings Econologica Archived at Ghostarchive and the Wayback Machine WING D MILLS 2013 FLO Pump and FLUTTER WELL Pump YouTube ENA Yelkapan Technologies Ltd Hagen L J and Sharif M 1981 Darrieus Wind Turbine and Pump Performance for Low Lift Irrigation Pumping U S Department of Agriculture Manhattan KS Report No DOE ARS 3707 20741 81 1 Keisar D Eilan B and Greenblatt D February 8 2021 High Pressure Vertical Axis Wind Pump ASME J Fluids Eng May 2021 143 5 051204 The types of windmills Odur Retrieved 2008 05 24 Smulders P T January 1996 Wind water pumping the forgotten option PDF Energy for Sustainable Development 11 5 Coil pump frequently used for windpump constructionExternal links Edit Wikimedia Commons has media related to Wind pumps A detailed photographic record of the restoration of an 8 Stewarts amp Lloyds windpump in South Africa History of the Water Pumping Windmill in America How Water Pumping Windmills work Retrieved from https en wikipedia org w index php title Windpump amp oldid 1167965053, wikipedia, wiki, book, books, library,

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