Slide 1

Joshua Lee, Yuree Chu

Slide 2

Wind Energy?

Slide 3

What is wind power? Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electrical power, windmills for mechanical power and so on.

Slide 4

Basic info

Slide 5

History of Wind Power

Slide 6

Slide 7

Slide 8

Now...

Slide 9

Energy transformation 1. Solar energy heating Earth 2. Kinetic energy of air 3. kinetic energy of turbine 4. Electrical energy

Slide 10

Wind Generator

Slide 11

How does wind generator work?

Slide 12

Efficiency of Wind Power

Slide 13

Power by wind generator

Slide 14

Limitation of wind power formula Wind power formula is an estimate because... a)Not all KE of wind is transformed into mechanical energy b)Wind speed varies over course of year c)Density of air varies with temperature d)Wind not always directed at 900 to blades

Slide 15

Sample problems A wind turbine has a rotor diameter of 20 m and the speed of the wind is 25 m/s on a day when the air density is 1.3 kg/m3. Calculate the power that could be produced if the turbine is 30% efficient.

Slide 16

Answer A wind turbine has a rotor diameter of 20 m and the speed of the wind is 25 m/s on a day when the air density is 1.3 kg/m3. Calculate the power that could be produced if the turbine is 30% efficient.

Slide 17

Maximum amount of power It is impossible to extract this maximum amount of power from the air because of... a)Speed of air... b)Frictional losses...

Slide 18

Advantages of Wind Power 1.Renewable source of energy 2.Source of energy is free 3.No global warming effect no CO2 emissions 4.No harmful waste products

Slide 19

Disadvantages of Wind Power 1. Large land area needed to collect energy since many turbines are needed 2. Unreliable since output depends on wind speed 3. Site is noisy and may be considered unsightly 4. Expensive to construct

Slide 20

ONE QUESTION...

Slide 21

Why are turbines not placed near one another? a) Less KE available for next turbine b) Turbulence reduces efficiency of next turbine

Slide 22

Future of Wind Power

Slide 23

Is wind power the solution?

Slide 24