Alternative Energy Sources

Wind Turbines

Wind: A General Description

Wind energy- is a renewable resource that is used to create electrical energy. Wind- is a natural force that results from the

uneven heating of the earth from the sun.

What are wind turbines made of?

All wind turbines, are comprised of the following components: The Rotor is used to

convert the kinetic energy of wind into rotational force used to turn a generator

The Gearbox is used to change the speed and torque of the Rotor

The Generator (makes electricity)

Tower

Wind: Current Technology

Use of wind the fastest growing renewable, unlimited energy resource.

Wind maps determine suitable locations for “Wind farms”

“Wind farms” currently provide ________ MW of electricity.

Wind Technology: “Wind Map”

Wind Technology: “Wind Map”

Jiminy Peak, Hancock Mass.- The Zephyr Turbine

www.jiminypeak.com

The purpose of a wind turbine rotor is to convert the kinetic energy of wind into rotational force used to turn a generator.

Blade Design Tradeoffs

Blade size Bigger = more surface available to catch wind Bigger blades weigh more

Blade Design Tradeoffs

Shape & number All blades must produce lift to work. To do this an

airfoil must be created, this is done in many ways depending on size, price and material used.

Airfoil

Airfoil A surface designed to produce lift from the movement of air over it.

Aerodynamics

Aerodynamics the study of the flow of air around and through an object.

Blade Orientation

Leading edge of each blade needs to point towards the next blade’s trailing edge. In order to sustain motion.

HUB

Wind Turbine Blade

Leading Edge

Trailing Edge

Blade Pitch

The Blade Pitch is the angle of the rotor blade in relation to the rotor.

When you have the correct pitch your rotor will spin

When you have too much pitch the rotor will stall (will not spin)