Wind Turbine Systems Vertical Axis

wind turbine systems vertical axis, residential wind power, wind power generators, wind energy, wind power








Wind Turbine Systems Vertical Axis

Discussion about the types of systems available and the advantages and disadvantages of each.

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Wind Turbine Systems Vertical Axis: Save Ten With Angie's List!

Although gaining in popularity, you will not see nearly as many vertical axis wind generators.

The shaft of this type of generator is mounted vertically, making the unit multi-directional, or these is no need to point it into the wind. This a distinct advantage where the wind is variable due to obstructions in the area.

The generator is quite often ground-mounted to reduce the torque on these units. Also because these units can develop what is called pulsating torque, they are often mounted on structures or nearer to the base of a tower - there is a distinct advantage to this in that the generator is much easier to service.

Also by mounting the Vertical Axis Wind Generator on a rooftop. you will see an increase in wind velocity as the wind travels up and over the roof.

Airplane Prop

Wind Turbine Systems Vertical Axis - Darrieus Sub-Type

Wind Turbine Systems Vertical Axis Sub-Systems:

Unlike Horizontal Axis Wind Generators the Vertical Axis Systems have several sub-type available.

Darrieus wind turbine systems vertical axis: This is commonly given the nick name of an 'Eggbeater Turbine because of the blades of the turbine resemble those of an ordinary eggbeater.

While they are quite efficient, they have issues with stress on the tower and bearings. The older types of Darrieus Turbines will have guy wires attached to the top of the unit for structural stability.

Newer units have external structural capibilities that transfer the loading to the top bearing.

Giromill wind turbine systems vertical axis: The blades of the Giromill Wind Turbine are mounted so they can rotate around their vertical axis.

This way the blade pitch can be varied so that the angle of attack can be optimized, as in the blade of the Horizontal Axis Wind Turbines.

Advantages of this system: The torque on the units is fairly constant and therefore structural or bearing failure is less of a concern. Look for units with 3 to 4 blades for the best torque factors.

Mast Height

Wind Turbine Systems Vertical Axis- Giromill Sub-Type

Savonius wind turbine systems vertical axis: These units consist of 2 or more 'scoups', usually mounted vertically, but there are horizontal units as well.

The Savonius Sub-types are very reliable, but are plagued with low efficiency.

You will quite often see these units designed and installed by do-it-yourselfers. They cut 55 gallon barrels in half and weld them in a vertical scoup-like fashion. This is a great way to have a low cost installation, but it will also be a low output system.

Wind Turbine Systems Vertical Axis - Wind Resource Information:

Wind Powering America
Pages with wind maps, general small wind information

Database of State Incentives for Renewable Energy
Lists tax and rebate incentives by state

State Wind Resource Maps

American Council on Renewable Energy
Works to bring all renewable energy into the mainstream of America's economy and lifestyle

Homer
Computer model for evaluating on- and off-grid power systems

American Wind Energy Association
Small wind information

Mast Height

Wind Turbine Systems Vertical Axis - Savonius Sub-Type

Wind Turbine Systems Vertical Axis - Advantages:

Vertical Axis Wind Generators are usually mounted closer to the ground, giving better access for maintenance and association concerns for site views from adjacent homeowners. (If the unit is mounted on a rooftop, you sill will have view concerns though).

The HAWT's typically have lower startup speeds. This means that they start generating electricity with a wind speed around 6 mph is lieu of about 8 mph for VAWT's.

Vertical Axis units are usually quieter. Compare decibel output ratings of various units when shopping for a generator.

Being that these units are usually mounted closer to the ground or on a roof structure, the approval process is considerably easier with neighborhood associations and your local building authority. This is especially true if you can tuck the unit in an out of the way location.

Certain sub-types of the VAWT pose much less of a threat to bird strikes, due to their solid makeup. This is especially true of the Savonius sub-type.

Bird Xpeller PRO

Wind Turbine Systems Vertical Axis - Homemade Savonius Sub-Type

Wind Turbine Systems Vertical Axis- Disadvantages:

These units are quite often plagued with bearing failures or bearing fatigue, because of the lateral wind forces place upon them.

While some units have addressed this problem with guy wires or structure to support of the top of the unit, this transfers additional downward force on the bottom bearing of the unit.

Given that these units are located closer to the ground, they are subject to wind surface drag or surface friction, which makes them inherently less efficient when compared to a HAWT of a comparable sized footprint.

Mast Height

Wind Turbine Systems Vertical Axis - Savonius Helical Sub-Type

Wind Turbine Systems Vertical Axis - Where You Go From Here:

We will be developing a lot of useful information as it relates to Wind Generation. Here are some of the articles coming up shortly.

Wind Generators
Wind Generator Components
Wind Turbine Systems Horizontal Axis
Wind Generator Systems Vertical Axis
Wind Generators Where to Start.

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