| By :
Roger Brown
The Savonius type and the Darieus type vertical wind turbine for the home are the 2 basic designs that encompass the majority of windmills out there. The most popular and the oldest is the Savonius windmill. Actually, it is one of the earliest designs and has been used in a variety of fluid movement situations. Not only air, but also in water. Paddlewheels like are used in a steamboat are fashioned this way. The concept is a drag aerodynamic where the blades are literally pushed around the vertical shaft. Compare that with the traditional horizontal wind turbine that looks like a Dutch windmill. Those are typically lift devices and they rely on the aerodynamics of the blades to push the blades in a vertical plane. The Savonius is not very efficient though. As a matter of fact, they are probably the least efficient of all the wind turbines out there. But, they serve a purpose. They are very inexpensive, relatively speaking. These Savonius turbines are very quiet and don't pose much of at threat to local migrating bird populations. Developed at the early part of the twentieth century, the Darieus wind turbine is more efficient than the Savonius. The Darieus looks like a giant eggbeater and typically is very tall. It needs to be because the surface area of their blades is quite small. Needless to say, most of the vertical wind turbines for the home found on roofs now are of the Savonius variety. They are simple to make and easy to repair. Helical designs are of the Savonius type. They scoop the air. The great thing about this concept is it doesn't make much noise and the neighbors tend to not disapprove, like is the case with many of the roof-mounted horizontal wind turbines. The vertical wind turbine for the home will become increasingly popular than the horizontal units because they can be fit in smaller places and are more aesthetically acceptable than horizontals. Actually, they can even be installed by the average person because of their simplicity. Summarizing - while both vertical wind turbines for the home will work, the vertical holds the most promise for the future. Do your homework upfront though and match the turbine to the task. A little work upfront will pay off in getting it right the first time. For most roofs the Savonius type turbine will end up being best though.
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