enbreeze GmbH is a new manufacturer of small wind turbines with 10 kW of power. The large rotor promises high electricity yields in low-wind inland areas. The Berlin-based start-up company is a good example of the innovative power of the small wind industry. The manufacturer will be presenting itself at Messe Husum ENBREEZE GMBH enbreeze GmbH, which currently has eight employees, has been financed by Lelbach Industrieholding since 2014 and has moved its headquarters to Berlin as part of this. Since then a strategic partnership has existed between Lelbach Industrieholding (also ELPRO GmbH) and enbreeze. The business areas of Elpro GmbH include control, automation, and power engineering. Jan Dabrowski is responsible for technical management. He laid the foundation for the technology for controlling small wind turbines in 2009 in a thesis at Karlsruhe Institute of Technology. The development of the 10 kW small wind turbine was started in August 2013, with tests and research on smaller prototypes being able to be consulted. In summer 2015, a small wind turbine was set up for test operation. Series production and market launch of the 10 kW system are planned for 2016. 10 kW SMALL WIND TURBINE The unique features of the Nimbus 10 kW include the large rotor, control technology, and design by aeroelastic simulation. The particularly large rotor relative to the generator power promises high yields even inland. The Nimbus has a rotor diameter of 11.5 m, which is much larger than many other models in this output class. For example, the 10 kW wind generator from the American manufacturer Bergey has a rotor diameter of 7 m. The larger the rotor, the higher the energy yields in low-wind conditions, which often prevail inland. The design of the rotor blades has been optimized for high yields in turbulent wind. enbreeze emphasizes the quiet operation of the wind turbine. A large rotor requires a sophisticated system for controlling load reduction. For Nimbus, a passive rotor blade adjustment system was developed, which moves the rotor blades out of the wind in high-wind conditions without electronics. The peak efficiency of the rotor is 52%, which is close to the physically possible optimum. For optimal design, the wind turbine was modeled using aeroelastic simulation during development. That which is standard with large wind turbines is rarely used with small wind turbines. Using these simulations, the operational loads can be significantly reduced, allowing cost reduction potential to be fully utilized. The components may be inexpensively transported in a container. Due to the hydraulic tilting mast, no crane is required for installation. SPECIFICATIONS OF THE SMALL WIND TURBINE: - Modell: Nimbus 10 kW
- Rated power: 10 kW
- Rated wind speed: 7,5 m/s
- Rotor diameter: 11,5 m
- Rotor surface: 103,9 sq.m
- Wind orientation: Downwind
- Mast height: 22 m
- Power control: Passive rotor blade adjustment
TECHNOLOGY TREND: LARGE ROTORS FOR LOW-WIND LOCATIONS
Wind turbines are designed and optimized for specific wind conditions. A high-wind site in the middle of the ocean has different requirements for wind power technology than a low-wind site inland. The decisive factor is the size of the rotor relative to the generator power. In the windy ocean, a relatively small rotor is sufficient. For weaker inland winds, you need a large rotor to make use of the power of the generator and produce a lot of electricity. For multi-megawatt turbines and small wind turbines, the technical development of recent years shows a trend towards maximizing the rotor surface. This technical concept can pay off, as the German manufacturer of large wind turbines Nordex proves. In 2014 Nordex profits quadrupled.
Some manufacturers of small wind turbines are choosing this strategy: Either existing wind turbines are being equipped with larger blades or new models with very large rotor diameters are being put onto the market. This is allowing the potential of suitable small-wind sites inland to grow significantly.
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