Wind farms may be hitting the big time, but that hasn't deterred inventors and technologists from tinkering, or even reinventing, the turbine itself. In the past few months we've seen wind energy systems that use discs attached to hydraulics and even charged water droplets, but how about skyscrapers outfitted with rotating window panels? This is the idea behind the University of Wollongong's PowerWINDows concept, a modular wind turbine designed to have less of an impact on the surrounding environment.
A team led by Professor Farzad Safaei, director of the Information and Communication Technology Research Institute at UOW, has spent the past four years designing the PowerWINDows as a method for harvesting wind energy that's less intrusive to the surrounding area.
At a glance, the current design looks not much different from a standard window, except the grid pattern is made up of panels that twirl in the breeze. Rather than have one large set of blades turning perpendicular to the wind's direction, the PowerWINDows are made up of smaller blades that rotate slowly along the same path as the wind.
According to Safaei, this method produces less air turbulence, reducing the amount of stress on nearby structures and generating less noise. Aside from lowering maintenance and operational costs, this design could theoretically be installed almost anywhere without having as much of a negative effect on the area nearby.
Another advantage the PowerWINDows could have over conventional wind turbines is modular construction, which allows more panels to be added when extra energy is needed, rather than setting up a whole new turbine. This design also means panels can be installed more easily and even integrated into existing structures, like the sides or tops of tall buildings.
Now that a solid design has been drawn up, the next step is to build a working model to analyze how the PowerWINDows stack up to other methods of wind energy harvesting. UOW recently signed an initial two-year agreement with marine engineering group Birdon Pty Ltd to create a prototype that can be used for further testing. If all goes well, the company hopes to start production on a commercial version for use around the world.
Source: University of Wollongong
VAWT weren't as efficient as predicted either. They cant be touched on the ability to deal with shifting winds. You often see wind farms where the turbines on the ends are spinning but the ones in the middle are idol. Look closely the wind is probably blowing in opposite directions at the ends of the wind farm. VAWTs in the middle could still run.
But they do not claim to be more efficient, they say they have less impact on environment. You will need more of these to create the same amount of energy as you would with conventional wind turbine towers, so where is the positive effect? More material used, more area wasted, more environment cluttered.
@slowburn: The turbine in the middle does not run because in the middle, there is no wind. A VAWT in the same place would not run either because of the same fact. If the drag is too high in an area, the wind will start to just flow around it. That is happening with too large wind farms in low wind conditions. Being a pilot, I see this very frequently: The direction of the individual towers clearly indicates a flow pattern, if looked at from above. The same effect limits the efficiency of any wind turbine: If it could pull out more energy, it would just slow down the air in it's area, and all surrounding air would just flow around it, and that's it, then.
I have both talked with an engineer with a wind energy company and seen the turbines visually turning in opposite directions.
Yes, they actually turn in different directions, because local wind is in different directions. Large wind farms also tend to separate warm air masses from the ground because of the turbulence they create. This creates thermal convection right over the plant and has great influence on local wind. On summer days, I have seen all the outer wind turbines of a farm facing outward and running, while the inner ones stand disoriented and mostly idle. Once this chimney effect is triggered, it can take quite some time before it comes to an end: Either supply of warm air must stop, or general wind must pick up enough to wash the whole system away. A VAWT would not help here, because it is not an issue of wind direction but rather wind speed.