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Wind power

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What is wind power?

` Wind power is the conversion of wind energy into a

useful form of energy.

` For example:

Usingwind turbines to make electricity,

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What is wind power?

` Wind power is the conversion of wind energy into a

useful form of energy.

` For example:

Usingwind turbines to make electricity,

wind mills for mechanical power,

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What is wind power?

` Wind power is the conversion of wind energy into a

useful form of energy.

` For example:

Usingwind turbines to make electricity,

wind mills for mechanical power,

wind pumps for pumping water or drainage,

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What is wind power?

` Wind power is the conversion of wind energy into a

useful form of energy.

` For example:

Usingwind turbines to make electricity,

wind mills for mechanical power,

wind pumps for pumping water or drainage,

or sails to propel ships.

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Wind turbine

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Wind turbine

` A wind turbine is a rotary device that extracts energy

from the wind. Wind turbines can rotate about either a

horizontal or a vertical axis, the former being both older

and more common.

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Wind Turbine

` We know three different types of turbines, modern

HAWT (Horizontal-axis wind turbines),Savonius

VAWT (Vertical-axis wind turbines) and

Giromill/DarrieusVAWT.

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Wind Turbine

` We know three different types of turbines, modern

HAWT (Horizontal-axis wind turbines),Savonius

VAWT (Vertical-axis wind turbines) and

Giromill/DarrieusVAWT.

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HAWT design

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HAWT design

` Horizontal-axis windturbines (HAWT) have themain rotor shaft (2) andelectrical generator (7) atthe top of a tower (15), andmust be pointed into thewind.

Small turbines are pointed bya simplewind vane (10),while large turbines generallyuse a wind sensor coupledwith a servo motor.

Most have a gearbox (6),

which turns the slowrotation of the blades (1)into a quicker rotation thatis more suitable to drive anelectrical generator.

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Wind power - video

` www.youtube.com

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Wind farms

` What is a wind farm?

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Wind farms

` What is a wind farm?

A wind farm is a group ofwind turbines in the same location used for productionof electric power.

` Individual turbines are interconnected with a medium-

voltage power collection system and communications

network.

At a substation, this medium-voltage electrical current isincreased in voltage with a transformer for connection to

the high-voltage transmission system.

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Wind farms

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Wind farms - Benefits

` Wind power is a renewable energy source that requires

no fuel to operate and does not produce any emissions

that are harmful to the environment.

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Wind farms - Benefits

` Wind power is a renewable energy source that requires

no fuel to operate and does not produce any emissions

that are harmful to the environment. Wind turbines are

made of plastic and metallic materials, so they don'thave any radioactive or chemical impact either.

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Wind farms - Benefits

` Wind power is a renewable energy source that requires

no fuel to operate and does not produce any emissions

that are harmful to the environment. Wind turbines are

made of plastic and metallic materials, so they don'thave any radioactive or chemical impact either. Wind

farms take up much less space than conventional power

plants, and they also make less noise pollution.

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Wind farms - Drawbacks

` Electricity produced from wind generally costs more

than that one produced from traditional sources like

natural gas and coal.

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Wind farms - Drawbacks

` Electricity produced from wind generally costs more

than that one produced from traditional sources like

natural gas and coal.At best, wind farms produce

electricity at an efficiency rate of30 percent, comparedto a 70 percent efficiency rate from natural gas and coal.

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Wind farms - Drawbacks

` Electricity produced from wind generally costs more

than that one produced from traditional sources like

natural gas and coal.At best, wind farms produce

electricity at an efficiency rate of30 percent, comparedto a 70 percent efficiency rate from natural gas and coal.

Wind energy is also unreliable. Wind can't be stored:

electricity must be produced on demand, yet wind is

inherently unpredictable.

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Wind farms - Drawbacks

` Electricity produced from wind generally costs more

than that one produced from traditional sources like

natural gas and coal.At best, wind farms produce

electricity at an efficiency rate of30 percent, comparedto a 70 percent efficiency rate from natural gas and coal.

Wind energy is also unreliable. Electricity can't be

stored: it must be produced on demand, yet wind is

inherently unpredictable. Back-up generators areneeded to make sure enough electricity is available to

meet demand.

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Wind power - video

` www.youtube.com

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Wind power usage

` Number of wind turbines in different nations.

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Wind power usage

` Number ofwind turbines

in Portuguese

regions.

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Literature

` http://en.wikipedia.org

` www.ehow.com

` www.youtube.com