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Steinau an der Straße, Germany

Wind energy gained in importance for electric power supply due to financial incentives for wind turbine generators (WTG) as politically favoured renewable energy source and the resulting technical further development. Building a relevant landscape element, the approvability of the structure plays a decisive role in planning and design of WTG. Another topic is the structural (and the related economical) optimisation of the plants in terms of most effective exploitation of the building material. As most of the WTG are fabricated in small batch series, certification or type testing is advantageous. Using the example of a WTG with savonius rotor, the proceeding of the structural analysis is shown including the most important load assumptions and an outlook on the required verifications. Copyright © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


In view of the impending energy transition in Germany, turning away from fossil fuels and atomic power and leading to renewable energy sources, the construction of very energy efficient new buildings gains more and more in importance. Because the saving of energy with efficient buildings offers the highest potential to achieve the energy transition without loss of comfort and also complying with the climate protection target of limitation of the carbon dioxid emission. For new buildings in the initial project planning phase, the client needs qualified consulting concerning a reasonable energy standard for his building. The consulting should comprise the multitude of energy efficiency standards and the related financial incentives and not only cover the minimum standard of the German Building Energy Conservation Regulation EnEV (Energieeinsparverordnung). But the architect can hardly quantify the potentials to reduce energy consumption of buildings considering the multitude of existing standards with multifarious effects on energy consumption, technical requirements and building costs. With the help of an example multi-storey residential building in Hannover, current energy standards for residential buildings are compared. Besides the building construction also the building services like heating, hot water generation and ventilation are considered and the most important results concerning energy consumption and investment costs are compared. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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