Wind Energy

-The Cause of Wind

Wind is caused by the self-rotation of earth and solar heat
Around 2% of solar energy transformed into wind

-Total Wind Energy & Bertz Limit

 
 


Wind Turbine

-Power Efficiency of Wind Turbine

Using aerodynamic effect to rotate blades and transform wind into mechanical engery
the mechanical energy then transformed into electric power through generator
The modernized wind turbine can achieve power conversion efficiency between 20-40%

-Energy Conversion Process of Wind Turbine

-Type of Wind Turbine

Wind Turbine by Air dynamic Type & by Axis Type

1. Drag type (savorius) 2. Lift type

    High Torque, Low Speed 

     Low Torque, High Speed

 

 

-Key Rotor Types of Wind Turbine

Rotor Type
Aerodynamic
Axis
Self-start
Cp
Key Problem
Propeller
Lift
HAWT
Good
High
Noisy,Turbulence
Darrieus
Lift
VAWT
Poor
High
Poor self-start
Savonius
Drag
VAWT
Good
Low
Poor effociency


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