Low Energy House - Helical Wind Turbines - VAWT
Wind power is a clean renewable source of energy. When in use, a helical wind turbine produces no carbon dioxide emissions
or waste products
Helical Wind Turbines - Vertical Axis
Helical wind turbines (VAWT) have rotor shafts that run vertically, unlike conventional small wind generators which have horizontal rotor shafts. The design of modern helical wind turbines has developed from early twentieth century designs combined with twenty-first century technology.
Helical Wind Turbines - Design
The new designs can deliver torque relatively evenly at variable wind speeds and the twisted blades have been designed to reduce noise and vibration when operating in turbulent shifting wind conditions. The turbine rotors are constructed of carbon fibre and epoxy resin and the assembly has very few moving parts, making them easy to maintain.
The aerofoil sections on the helical wind turbine are symmetrical from top to bottom and from leading edge to trailing edge. As a result, the helical wind turbine will rotate equally efficiently in either direction.
Helical Wind Turbines in Urban Areas
Helical wind turbines are popular in residential areas as they require slow minimum wind speed to start and turn the rotor. They can also be placed nearer to ground level and they can turn irrespective of wind direction. Helical wind turbines can also be safely used in regions where wind speeds are high.
Helical Wind Turbines - Efficiency
Although helical wind turbines have some advantages when compared with conventional horizontal axis wind turbines (HAWT), they are not necessarily better in all areas of operation. When choosing a helical wind turbine, it is important to make an accurate comparison between all available models to ensure that the most appropriate model is chosen. To this end the British Wind Energy Association (BWEA) has tested various types alongside conventional horizontal axis wind turbines.
British Wind Energy Association
The BWEA has devised a technical standard for manufacturers of small wind turbines who wish to supply in the British market place.
When choosing a small wind power system that meets this standard, a user can be assured that the turbine has been designed to withstand the structural loads that the wind can impose, that it has been tested in a full range of wind speeds and that in general it meets the claims made for overall performance.
It is useful for grant giving bodies, structural engineers and green energy specifiers who wish to ensure that any small wind turbine proposed is designed to the best practices accepted in wind energy engineering.
Before embarking on a system of renewable energy, it is advisable to
improve the energy efficiency of your house through improved insulation, draught proofing, low energy lights and heating controls
If you are not able to install your own helical wind turbine system, you can support renewable energy by
switching to a supplier of green electricity