Motorwind micro wind turbines brings renewable energy to urban use
March 21, 2007 § 4 Comments
Despite its possibilities, the wind energy was almost exclusively used in large open areas where winds blow with at least 6m/s. Only a few such wind turbines are installed in house yards but I haven’t seen many installed in urban areas, especially on blocks.
One of my “never published” sketches showed something similar installed on the block’s façade, where only the window’s area was left uncovered with such small propellers. It’s just that my ideea wasn’t backed with lots of engineering knowledge so it only remained on paper.
I am glad someone else brought this to life and one can actually install it in urban areas. I am talking about the Hong Kong University researches who have devloped a small-scale wind turbines grid that can be used in both rural and private areas. Motorwind sells them for $150 a piece, a price that is ok even now, when the production isn’t mass targeted. They also claim to donate the university a portion of these money for going on with their research.
The Motorwind web site sais about the generators:
Motorwind micro turbines can work in wind speeds of only 2m/second. Their light weight, small size, and flexible configuration allows them to be installed in both urban and rural environments, for individual or corporate use. Motorwind turbines give users a new option for efficient renewable energy and therefore reducing their impact on the environment.
Also, for one of the models sold Motorwind gives these specifications:
8 micro turbines with generator rated 50W for 10m/s of wind. Daily production: 1.2 kWh. Output= 12 to 100 volts non-regulated.
If my monthly bill is about 50 kWh (approx 6 US$ or 50 HK$ or 5 euro ) that means my daily need is approx 1.5 kWh .
i need approx 4 square meter of turbines (80 turbines = 4 x 20 turbines sets ) if the wind average is about 4m/s
My sketch was something like this:
Of course it was more elaborate, the bar behind each row has an aileron to get it rotate with the wind, so that the propeller always faces the wind from the front, then the rows weren’t placed in the same vertical plane, it was a sort of a zig-zag so that the wind doesn’t get blocked by the other rows when the wind blows from a side.
Anyway here are some pictures of the device in the title:
Pretty resembling isn’t it?;)
The very ingenious part of this set is that each propeller rotates the other ones so that the gears for transmitting the movement to a generator is only on one side of the frame. Brilliant, I wouldn’t have thought about this: