A Kids Introduction to Vertical Axis Wind Turbines
Did you ever look up into the sky and saw a wind turbine? A high structure with lengthy blades twirling around the wind like a pinwheel on an upbeat afternoon. But, have you ever heard that there are different types of wind turbines? The first type is called a Vertical Axis Wind Turbine or the VAWT. Instead of having blades that rotate like a fan, the VAWT has smaller and less visible blades that spin around a central vertical axis resembling you spinning as if on merry-go-round.
Why someone might choose a VAWT over the more traditional horizontal axis wind turbine (HAWT) is explored next. For starters, VAWTs are able to operate in any wind direction (unlike HAWTs which must point into the breeze to work), and so make better use of turbulent winds. In practice, this means VAWTs can be located more closely together, which saves space and increases efficiency. Another interesting thing about VAWTs is, they are virtually silent and have minimal vibrations which could be beneficial to urban housing.
This might have got you thinking which is the better wind turbine — The VAWT or HAWT? I guess that depends on the particular context.... HAWTs are the predators of big wind farms: they do just what our Physics teacher asked for, and lead to faster spin rates because being in a large group means that they can crowd out other turbines. VAWTs, on the other hand, are suitable in locations where there is limited space or unpredictable winds. VAWTs are also aesthetically more preferable to some because they can be quite artistic and pleasing compared to HAWTs.
However, as climate change causes us to focus more on renewables power sources VAWT technology is only ever getting improvements made by scientists and engineers. A really exciting one is the concept of flouting VAWTs, which might be better adapted to offshore wind farms. Notably, these underwater turbines would capture energy from both the gusts of wind and waves at sea to generate electricity - a feat that has been impossible for even traditional winds in deep ocean waters.
Vertical Axis Wind Turbines have in fact been around for centuries but only recently are being considered as an option to benefit from clean energy. Thousands of years ago in ancient Persia, vertical axis windmills were built to grind grains (and even pump water). In the meantime, VAWTs have changed a lot in design and new constructions provide for better energy collection than any windmill in history. Fast forward to 21st century-VociWind has become efficient machines by now.
Vertical Axis Wind Turbines are a modern and fun way to get started with renewable energy. Although they are not as well-known or traditional as wind turbines, vertical axis mechanisms have their own set of benefits and have continuously been developed to adjust with the needs of our fluctuating environment. Therefore next time if you see a wind turbine, do not be quick to judge — it might even have been actually the VAWT uniquely poised against the blowing air!
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