Sambrin Franco

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Wind energy

Map of available wind power for theUnited States. Color codes indicate wind power density class.
Wind energy is the kineticenergy of air in motion, also called wind. Total wind energy flowing through an imaginary area A during the time t is:
[27]
where ρ is the air density; v is the wind speed; Avt is the volume of air passingthrough A(which is considered perpendicular to the direction of the wind); Avtρ is therefore the mass mpassing per unit time. Note that ½ ρv2 is the kinetic energy of the moving air per unit volume.Power is energy per unit time, so the wind power incident on A (e.g. equal to the rotor area of a wind turbine) is:
[27]
Wind power in an open air stream is thus proportional to the third power ofthe wind speed; the available power increases eightfold when the wind speed doubles. Wind turbines for grid electricity therefore need to be especially efficient at greater wind speeds.
Wind is themovement of air across the surface of the Earth, affected by areas of high pressure and of low pressure.[28] The surface of the Earth is heated unevenly by the Sun, depending on factors such as the angleof incidence of the sun's rays at the surface (which differs with latitude and time of day) and whether the land is open or covered with vegetation. Also, large bodies of water, such as the oceans,heat up and cool down slower than the land. The heat energy absorbed at the Earth's surface is transferred to the air directly above it and, as warmer air is less dense than cooler air, it rises abovethe cool air to form areas of high pressure and thus pressure differentials. The rotation of the Earth drags the atmosphere around with it causing turbulence. These effects combine to cause aconstantly varying pattern of winds across the surface of the Earth.[28]
The total amount of economically extractable power available from the wind is considerably more than present human power use from...