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Wind Energy Technology. Unit 8. Use Policy. This material was developed by Timothy J. Wilhelm, P.E., Kankakee Community College, with funding from the National Science Foundation as part of ATE Grant No. 0802786. - PowerPoint PPT Presentation
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ELTR 1223Survey of Renewable
Energy Technology
Wind Energy Technology
Unit 8
Source:
Use Policy This material was developed by
Timothy J. Wilhelm, P.E., Kankakee Community College, with funding from the National Science Foundation as part of ATE Grant No. 0802786.
All materials in this presentation are designed and intended for educational use, only. They may not be used for any publication or commercial purposes.
Source:
Author, Editors/Reviewers Author: Timothy J. Wilhelm, P.E.,
Kankakee Community College Editors/Reviewers / Modifier: Chris Miller Heartland Community
College
Source:
Objectives Students will be able to describe, in
very simple terms, at least three different styles of “prime mover” used to convert linear air movement (wind) into rotational shaft movement.
Students will be able to briefly describe, in very simple terms, at least two of the basic criteria for properly siting a modern wind turbine. Source:
Objectives Students will be able to describe, in
very simple terms, how change in wind speed affects the output of a modern wind-driven generator.
Students will be able to describe, in very simple terms, three different size-groups of modern wind turbines and their typical applications.
Source:
Objectives Students will be able to describe, in
very simple terms, at least three advantages and three disadvantages, to a local community, relative to the local construction of a commercial wind farm.
Source:
One of the Earliest Applications of Wind Power
Source: http://tonto.eia.doe.gov/energyexplained/images/WINDENERGY1.gif
Wind Energy History 5000 BC – Wind-driven sail boats
were moving on the Nile River
200 BC – Wind-powered pumps were moving water in China;
and, sail-wing windmills (with woven-reed sails) were used in Persia and the Middle East
What is a mill? Mill (noun):
a. A building equipped with machinery for grinding grain into flour or meal.
b. A device or mechanism that grinds grain.
Mill (verb): a. To grind, pulverize, or break down
into smaller particles.
Driving a Mill
Horse-Powered vs. Wind-Powered
Source: http://www.tvnet.lv/men/images/upload/04.jpg
The Term “Mill” Stuck…Wind “Mill” pumps have been used for
centuries in the Netherlands.
Windmills to Drive Generators Charles Bruch – GE, Cleveland, OH Brush Windmill – 1888
50’ diameter
144 cedar blades
12KW generator Battery charger
Source: http://ecoinventos.files.wordpress.com/2007/05/220237i1.jpg
Source: http://centros5.pntic.mec.es/ies.victoria.kent/Rincon-C/Curiosid/rc-74/image006.jpg
How to Divert Wind Energy Vertical Axis Machines
Simplest Least efficient
Horizontal Axis Machines Requires “yaw” control – face the wind Can be “upwind” or “downwind”
Drag-type blades – applies to both V and H
Lift-type airfoils – applies to both V and H
Drag vs. Lift
Linear wind PUSHES against angled surface and resulting force vectors create torque.
Drag vs. Lift Lift-type airfoils use the Bournelli
Effect.
Single-sided vs. true airfoil
Source: http://thales.cica.es/rd/Recursos/rd99/ed99-0226-01/liftmovi.gif
Machine Types – VA va HA
Source: http://www.redriven.net/skin1/images/wtconfig.gif
Vertical vs. Horizontal Axis
Vertical axis machines do not care which direction the wind is from.
Simple, but inefficient.
Unless shrouded, they fight themselves.
Vertical vs. Horizontal Axis
Vertical requires yaw control and often a mechanical power transmission.
More complex.
More efficient.Source: http://www.acsaeolica.com/img/productos_torre06.jpg
Savonius – Vertical Axis, Drag
Source: http://www.reuk.co.uk/Savonius-Wind-Turbines.htm
Darius – Vertical Axis, Lift
Source: http://www.reuk.co.uk/OtherImages/darrieus-rotor.jpg
Midwest Windpumper -- Drag
Modern Windgennie -- Lift
Source: http://i.treehugger.com/files/airx.jpg
Upwind vs Downwind
Source: http://thales.cica.es/rd/Recursos/rd99/ed99-0226-01/sotovento.jpg
Source: http://hensonelectric.com/Excel.Color.jpg
2-Blade vs. 3-Blade (vs. 1Blade?)
Source: http://3.bp.blogspot.com/_PpVQS40h-MA/R5j4vqOuD9I/AAAAAAAAAKA/F3sOpAGsZdc/s320/aerogerador%2Bmoinho%2Bvento.jpg
Wind-Driven Electrical Generators
PM Field DC Generators Smaller machines Battery charging and inversion
PM Field AC Alternators “Wild” AC Rectified for battery charging and inversion
Synchronous Alternators Larger machines Often 3-phase Grid-tied, only
Modern Wind Generators Horizontal axis 3-bladed True airfoil Loss-of-load protection
Modern electronics High Wind protection
Yaw control Pitch control
Modern Wind Generators
Source: http://www.testek.com/images/diagram.gif
High-Wind Yaw Control
High winds mechanically force the face of the turbine away from the direct force of the wind.
Some machines rotate face sideways.
Some machines tilt face back toward the sky.
Pitch Control – relies on “Stall”
PLC Control maintains constant rpm needed for AC grid-tie machines.
Source: http://thales.cica.es/rd/Recursos/rd99/ed99-0226-01/stallmov.gif
Source: http://thales.cica.es/rd/Recursos/rd99/ed99-0226-01/pitchmo.gif
Wind Siting – Wind Speed is CRITICAL Power is proportional to the cube of
the wind speed…(wind speed)3 !
Wind Turbine Siting – Wind Speed
Estimates
Source: http://www.seps.sk/zp/fond/2002/vietor/enq2.jpg
Wind Turbine Siting – Wind Maps
Wind Turbine Siting – Wind Rose
Wide wedges gives the relative frequency of each of the 12 wind directions.
2nd wedge tells how much each sector contributes to the average wind speed.
Red wedge how much each sector contributes to the energy content of the wind.
Source: www.windpower.org
Wind Turbine Siting – Terrain Effects Laminar flow vs turbulent flow
Roughness and obstacles Laminar flow (straight-line) winds are
available aloft. Rule of Thumb:
Bottom of turbine’s swept area should be 30’ to 50’ above anything within a 300’ horizontal radius.
Power-cubed – wind-speed relationship…taller tower is cheaper than heavier machine with heavier tower.
Speed up effect Hill effect
Speed up effects Tunnel effect
Sizes and Applications Small wind – residential
10KW and less
Small wind – commercial 100KW and less
Large wind – commercial wind farms, industrial applications
Small wind issues Suitable wind resource Sufficient property/space Allowed by zoning Accepted by neighbors Technical ability of the owner to
maintain the machine Tower types – monopole, lattice,
guyed, tilt-up
Tower types
Source: http://www.northerntool.com/images/product/images/339987_med.gif
Commercial wind siting Same as small wind, plus…
Sufficient participating land owners Proper zoning ordinance Special Use Permit Application County Planning Commission County Zoning Board of Appeals County Board Special Use Permit Granted Building Permit Application and Approval
Commercial Wind issues
Shadow Flicker Blade Glimmer Amplitude Modulation Noise Infrasound Disturbance of the natural vista Vibro-Acoustic Disease/Wind Turbine
Syndrome TV and Communications Interference
Interesting Experiences
Future? Maglev Wind Turbine
Source: http://www.technogeek.ro/images/turbina_maglev.jpg