Small Wind Electric Systems | Department of Energy . From the doe website a good article
The views in this article mainly talk about conventional wind turbine technology and do not really get into vertical ax wind turbines .
If you have enough wind resource in your area and the situation is right, small wind electric systems are one of the most cost-effective home-based renewable energy systems -- with zero emissions and pollution.
Small wind electric systems can:
Our pages on planning for a small wind electric system, and on installing and maintaining a small wind electric system have more information.
How a Small Wind Electric System WorksWind is created by the unequal heating of Earth's surface by the sun. Wind turbines convert the kinetic energy in wind into clean electricity. When the wind spins the wind turbine's blades, a rotor captures the kinetic energy of the wind and converts it into rotary motion to drive the generator. Our wind power animation has more information about how wind systems work and the benefits they provide.
A small wind system can be connected to the electric grid through your power provider or it can stand alone (off-grid). This makes small wind electric systems a good choice for rural areas that are not already connected to the electric grid.
Small Wind Electric System ComponentsA wind electric system is made up of a wind turbine mounted on a tower to provide better access to stronger winds. In addition to the turbine and tower, small wind electric systems also require balance-of-system components.
TurbinesMost small wind turbines manufactured today are horizontal-axis, upwind machines that have two or three blades. These blades are usually made of a composite material, such as fiberglass.
The turbine's frame is the structure onto which the rotor, generator, and tail are attached. The amount of energy a turbine will produce is determined primarily by the diameter of its rotor. The diameter of the rotor defines its "swept area," or the quantity of wind intercepted by the turbine. The tail keeps the turbine facing into the wind.
TowersBecause wind speeds increase with height, a small wind turbine is mounted on a tower. In general, the higher the tower, the more power the wind system can produce.
Most turbine manufacturers provide wind energy system packages that include towers. There are two basic types of towers: self-supporting (free-standing) and guyed (supported with wires). There are also tilt-down versions of each tower type.
While tilt-down towers are more expensive, they offer an easy way to perform maintenance. Tilt-down towers can also be lowered to the ground during hazardous weather such as hurricanes.
Balance of System ComponentsThe balance-of-system parts you'll need for a small wind electric system -- those in addition to the wind turbine and the tower -- will depend on your application. For example, the parts required for a water pumping system will be much different from what you need for a residential application.
The balance-of-system parts required will also depend on whether your system is grid-connected, stand-alone, or hybrid.
Manufacturers and installers can provide you with a system package that includes all the parts you need for your particular application. For a residential grid-connected application, the balance-of-system parts may include the following:
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Johnny Heath decided to Write something about Affordable Wind Turbines. No need to be fancy, just an overview.