Different Types of Wind Turbines | The Renewable Energy Hub
 

Types of Wind Turbines

What are the different types of wind turbines?

People tend to think about large collections of white towers dotted across farmland and floating offshore when someone mentions wind turbines. In truth, they now provide a large portion of the recently added power capacity that many states in the US enjoy.  It’s not the only place where you can see them nowadays. A single, roof mounted or free standing wind turbine can be used on its own to supply power for many domestic properties or businesses, particularly if they have the right conditions available.  

All wind turbines depend on a central axis that, when it turns, feeds into a generator and produces electricity. There are two ways this is normally done, with a vertical axis turbine or a horizontal one.

Horizontal Axis Wind Turbines

Think of those massive blades spinning offshore and you’ll have a good idea what a horizontal wind turbine looks like. It normally faces in one direction with the blades presented like the archetypal windmill.

The main rotor shaft and generator is held in the box at the top of the array and everything is placed at the apex of a high column. It’s suitable to be used in places where the wind factor is high because it is robust and built to withstand strong forces. The disadvantages of the horizontal axis wind turbine are that it requires heavy construction and they are often considered more obtrusive.

Vertical Axis Wind Turbines

Wind turbines that have a vertical axis are starting to become more popular as a way for generating localised electricity particularly for new constructions. Because the axis is vertical, with the blades arranged around it, the array doesn’t need to be positioned directly into the wind as with horizontal axis turbines. The benefit of vertical axis turbines is that they can be placed much closer to the ground and are ideal for roof top arrays. They are also lighter and more easily introduced into a domestic, town or inner city environment.

How Wind Turbines Generate Electricity

When the blades of a wind turbine turn, they rotate the axis which feeds into a generator. This creates a DC current which can then be passed through an inverter that changes it to AC, suitable for powering your home. If you are using it just as your own power source, then you can charge up batteries or if you are producing an excess amount of power then you can you can either sell it to the grid, if that is available in your state, or benefit from net metering, off-setting your usage for the future.

Which Wind Turbines are Suitable for Me?

Whereas a renewable technology like solar panels simply needs a good roof to make it a viable proposition, opting for a wind turbine to power you house or business will need a little more thought. You need an optimum wind speed of around 5 metres per second and an unobstructed space – in other words little in the way of trees, buildings or walls to prevent that wind getting to you or interrupting the flow. Because of this, most urban and suburban properties in US towns and cities would find it difficult to get the benefits from a wind turbine.

If you think your house or business should have a wind turbine then we suggest you fit an anemometer, or wind gauge, for a couple of months to check on the viable wind speeds.

For sites that would suit a wind turbine, there are two types of instalment that can be used, roof mounted and free-standing.

Roof Mounted Wind Turbines

As you might expect these are placed on the roof and are used to feed electricity directly to a property. In this case the property provides the height to get the required wind force. The advantage of a roof mounted turbine is that it presents less difficulty with installation and is cheaper (a 1 kW system may cost around $3,000). The disadvantage is that it may not provide the power that you need for all your own electricity nor the higher levels that mean you can make a profit from the Feed in Tariff by selling your excess to a power station.

Free-Standing or Pole Mounted Wind Turbines

When it comes to wind turbines, height means everything. The ideal place for a free-standing turbine is on top of a hill with a smooth top that is free from turbulence and obstructions such as buildings. The benefit of free-standing turbines is that they produce a greater power output and are therefore more likely to cover your entire electricity needs.

The disadvantage is that they are not suitable for urban areas where you are likely to attract planning permission objections. Free-standing systems are also more expensive than their house mounted counterparts, costing around $12,5000 for a 1.5 kW array.

The Future of Wind Turbines

Much work has been done on the design and efficiency of wind turbines, particularly over the last few years. In the future you may see airborne installations, flying above your town  as well as new, more exotic and aesthetically pleasing constructions on the roof of your neighbour’s house. The USA has huge potential for getting a large amount of its power from wind energy and many states are concentrating on it because of their Renewable Portfolio Standards.

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