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Current issue

ELEKTRO 1/2018 was released on January 16th 2018. Its digital version will be available on February 12th 2018.

Topic: Electrotechnology; Materials for electrical engineering; Wiring material

Main Article
A new electrical insulating fluid and its possible deployment in practice

SVĚTLO (Light) 6/2017 was released on December 11th 2017. Its digital version will be available on january 11th 2018.

Lighting installations
The lighting of university building Centrale Supélec in Saclay in France
The light for our future

Daylight
Application and judgment light guides Solatube®

Vortex Bladeless, the windmill without blues

18.05.2015 | www.repsol.cz |

A bladeless windmill aims to achieve an important increase in energy efficiency in wind power facilities. Do you want to learn more? The project was chosen by Fundación Repsol's Entrepreneurs Fund. More than a century ago, Theodore von Kármán explained the physics behind why many chimneys and cylindrical towers suffered such a battering from the wind at certain times of the year. The reason was found in the formation of whirlwinds. When the flow of air is constant and hits an obstacle, it tends to form these types of eddies. This made the towers and chimneys sway from side to side. What was a problem at the time, can now be seen as an advantage. 

Three entrepreneurs have designed a bladeless windmill with a cylindrical shape that aims to generate electricity using the swaying of the windmill that the air currents cause. 

The structure consists of a cylindrical cone, fixed to the ground with an elastic material. This is adapted to the trajectory of the eddies and tries to create more eddies in a controlled manner. This wind turbine contains a system of coils and magnets that, thanks to the swaying of the structure, generate electric energy.

Its creators wanted this technology to make little noise, and there to be no interference with other devices such as, for example, radars. As they operate without blades, the design of these kinds of wind turbines eliminates the need to install a good part of the mechanical elements. This also makes them easier to transport and maintain. The cylinder is made with fiberglass to make it rigid and give it elasticity. It's also a system that doesn't need oil, which means a reduced impact on the environment with respect to other technologies. It's a device that is capable of generating energy in a wide range of wind speeds. It activates with a speed of just one meter per second!

With all these factors in mind, the creators of the Vortex Bladeless estimate an improvement in energy efficiency of up to 40%.

Read more at repsol.com and at www.vortexbladeless.com