WIND TURBINE

Bikram Dahal067-BIE-10

INTRODUCTION

• kinetic energy of a moving wind is converted into mechanical energy

• Can be use for power genertion,pump

• Windmills were used in Persia(200 B.C)

•  first electricity-generating wind turbine (July 1887 by James Blyth)

• Enercon E-126 is largest (7.5m)

POWER

time

)()(

time

K.E. Power

22

1 velocitymass

velocityareadensitytime

mass

2)()( Power

33

21

AVvelocityareadensity

– Effect of swept area, A

– Effect of wind speed, V

– Effect of air density,

EFFICIENCY

• air would be cant be completely still behind rotor• Theoretical limit of rotor efficiency is 59%• Most modern wind turbines are 35 – 45%

POWER GENERATION

POWER GENERATION

BLADES DESIGN

• Drag Design– the wind literally pushes the

blades out of the way– slower rotational speeds ,high

torque• Lift Design– pressure differential is created

between blade()– higher rotational speeds

TYPES• Horizontal axis–rotor shaft and electrical generator at the top of a tower–usually three-bladed(why?) and pointed into the wind by computer-controlled motors. –high efficiency, and low torque ripple, which contribute to good reliability–Requires a relatively high wind speed

cont• Vertical axis –main rotor shaft arranged

vertically– turbine does not need to be

pointed into the wind – low wind speed and –Lower Vibration and sound

levels –Height of instillation should

be low from ground and can be use for low power generation only

• HAWT

• VAWT

HAWT VS VAWT• COEFFICIENT OF WIND POWER

USE• COST• MAINTAINABILITY• DIRECTIONALITY• RELIABILITY• DESIGN OF BLADE• HEIGHT OF INSTALLATION• ECOLOGICAL ISSUES

CONCLUSION

• VAWT best for Nepal

THANK YOU FOR YOUR ATTENTION