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Wind Energy- From Heat To Motional Energy

 Mukul M. Sharma
  8th-Dec-2016
Description: Wind Energy:- The Wind from heat to motional energy: Radiation from sun-Heat, Pressure gradients, Motion. Coriolis acceleration-deflection. Large scale global wind systems.Wind Power Harnessed. Wind Turbine Power:- P = 0.5 x rho x A x Cp x V3 x Ng x Nb. P=Power in watts(746 watts=1hp), rho= air density(about 1.225 kg/m3 at sea level, less higher up). A = rotor swept area, exposed to the wind (m2). Cp = Coefficient of performance (.59 {Betz limit} is the maximum theoretically possible, .35 for a good design). V = wind speed in meters/sec (20 mph = 9 m/s). Ng = generator efficiency (50% for car alternator, 80% or possibly more for a permanent magnet generator or gridconnected induction generator). Nb = gearbox/bearings efficiency (depends, could be as high as 95% if good).
Views: 910
Domain: Energy
Category: Wind/Water/Geo
Maxims of Tech: Rules of Engagement for a Fast Changing Environment
Contents:
Wind Energy
Mukul M. Sharma

U.S. Use of
Renewable
Energy

Source: Annual Energy Review 1999, U.S. Energy Information Administration.

Power Class

Wind
Power
(W/m2)
1
2
3

4
5
6
7

Speed
(m/s)
<200

<5.6

200300
300400
400500
500600
600800
>800

5.66.4
6.47.0
7.07.5
7.58.0
8.08.8
>8.8

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