The literal high point of the energy concept is located 85 meters above the earth. The wind sail, a curved steel construction which is covered with a textile membrane, is to be found here. In this case, form follows function, because the wind roof is a significant component of the concept for converting minimum effort into maximum energy savings. The necessary negative aerodynamic pressure for enabling the thermal current within the double-glazed buffer zone is created only as a result of this roof wing. On the basis of the so called "Venturi effect', the wind power beneath the wing ensures, during all seasons of the year, that outgoing air is drawn up, in the same manner
