Vertical Wind Turbine Generator Blades
Vertical Wind Turbine Generator Blades
Buy a set of wind turbine generator blades for a VAWT
windIf you are interested in making your own
vertical axis wind turbine (VAWT) generator, then you should take a look on eBay UK.
surmise81 is selling
blade sets which can be fitted onto a suitable
permanent magnet generator or
stepper motor to make a
Savonius type wind turbine generator.
These
VAWT blades are made from lightweight aluminium with a 1.000" diameter hub. The hub can be connected to a generator by screwing it directly to the generator shaft (you'll need to have at least basic metalwork skills and tools), or using a pulley or chain of some sort.
The blades have been selling well for the last few weeks with prices reaching up to £40 plus £6.50 for UK postage.
How Much Power Can These VAWT Blades Generate
The
VAWT blade set has blades with a height of 29cm and an outside diameter of around 40.5cm. This gives a
swept area of 0.12 square metres. The amount of power in the wind is given by:
0.5 * air density * swept area * cube of the wind speed
*
find out more about this wind power calculation here.
Therefore, in a 5 m/s wind (average wind speed in a pretty good location), there is 0.5 * 1.23 (at sea level) * 0.12 * (5x5x5) = 9 Watts of wind energy hitting the blades, and 10 m/s wind, 74 Watts.
Not all of that wind power can be converted into electrical power because of the
Betz limit and inefficiencies in the generator and bearings - so we shall assume that one-third of that power can be taken from the wind and turned into electricity. Hence a
wind turbine generator made with these
VAWT blades will generate no more than 3 Watts of electricity in a 5 m/s (11mph) wind, and 25 Watts in a 10 m/s (22mph) wind.
Article Last Modified: 15:39, 30th Jan 2007
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