Gallery: KfW Headquarters Aims to be the Most Energy-Efficient Office T...

KfW is a government-owned German Bank that helped bankroll the German solar renaissance in recent years - and it just moved into what it hopes will be the most energy-efficient office tower in Europe. The new addition to the company's Frankfurt headquarters by Sauerbruch Hutton is an aggressively engineered and colorful tower which is aiming for an astonishingly low energy consumption of 7 kW hr per square foot each year. That's more than two times more efficient than code, but the occupants actually benefit as the building is naturally cooled by fresh prevailing breezes thanks to a unique double skin composed of thousands of computer-controlled windows which that let just the right amount of air in.

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