Wind Turbines
Renewable energy
Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale
Wind Energy
Wind energy is useful form of energy converted from
kinetic wind power
Wind Energy is an indirect form of solar energy which can be used continu-ously
unlike solar energy
Wind turbinesTurbines can be categorized into two classes
based on the orientation of the rotor
Vertical Axis turbines
Turbines with rotary axis that are vertical
New design concepts come to market on a regular basis.
Vertical Axis turbine examples
Vertical Axis turbine examples
Vertical Axis turbine examples
Vertical Axis turbine examples
Vertical Axis turbine examples
Advantages of being vertical
o Omni-directional - accepts wind from any di-rection
o Components can be mounted at ground levelo lighter weight towerso ease of service
Disadvantages
o Rotors generally near ground where wind is poorero Poor self-starting capabilitieso Requires entire rotor to be removed to replace bearingso Overall poor performance and reliability
Horizontal Axis turbines
Turbines with rotary axis that are horizontal
Old and time tested design that gets slight improvements constantly
Horizontal Axis turbine examples
Horizontal Axis turbine examples
Horizontal Axis turbine examples
Horizontal Axis turbine examples
Horizontal Axis turbine examples
How do they work?
Advantages
o Old time tested designo Tall tower allows placement on uneven land or
in offshore locationso Tall tower allows access to stronger windo Ability to warp blades, which gives the turbine blades the best angle of attack
Disadvantages
o Difficult to transporto Difficult to installo Local opposition to aesthetics and noise levelso Difficult maintenance
Vestas V164 8MW
Current biggest wind turbine in the world
Key factso Output of 8.0 MW – enough to power over 13 000 homes
Key factso Output of 8.0 MW – enough to power over 13 000 homeso Height of 220 metres
Key factso Output of 8.0 MW – enough to power over 13 000 homeso Height of 220 metreso Blade length of 80 meters
Key factso Output of 8.0 MW – enough to power over 13 000 homeso Height of 220 metreso Blade length of 80 meterso Nacelle weight of around 390 tones
Key factso Output of 8.0 MW – enough to power over 13 000 homeso Height of 220 metreso Blade length of 80 meterso Nacelle weight of around 390 toneso Developed from the beginning as a off-shore solution
