BOB AG - Airport City, Düsseldorf

D ̧sseldorf Airport City - BOB AG
Architekten Chapman Taylor, D ̧sseldorf

BOB projects stand for energy-efficient office buildings with the task of reali- sing healthy working and climate protection. Many new office buildings are unfortunately characterised by "sick building syndroms" and excessive energy consumption for heating, cooling and lighting. Healthy building focuses on the indoor climate and the lighting quality of the interiors.

The unique characteristic of all BOB projects is an energy-saving heating and cooling concept which is based on the temperature control of the concrete ceiling by water-bearing pipes inserted in the concrete core. Furthermore, all projects have a balanced ratio of window area proportions in the floor plans, which react dynamically in their behaviour to the summer sunlight through the passive cooling of the daylight technology. The passive cooling effect is realised through the deflection of light back into the sky. The retro systems ensure that the incident solar radiation is not converted into heat.

A keyword in energy-saving buildings is daylight autonomy, i.e. optimised utilisation of the daylight available, using the full, natural daylight spectrum. This is achieved by colour-neutral glazing and, in the case of intensive solar radiation, by dimming the light transmission. For this purpose, the retroreflec- tive light deflection louvres are provided with metallic reflectors without causing a colour shift of the light spectra.
Most BOB light-steering louvres are equipped with crank operation so that the user can easily influence the lighting design of the interior. This simplification is made possible by the special optics of the light control, which allow a horizontal, open and transparent louver position in summer when the sun is high. This realises another aspect of healthy buildings: The view through to the outside relaxes the eyes. In any case, from the user's point of view, the view through to the outside is the highest quality criterion of a sun protection system.

BOB projects counteract the often excessive expenditure on building control and are characterised by low maintenance and durability. This also includes interior sun protection, which, due to its precision optics, offers a higher-quali- ty substitute for the otherwise maintenance-prone exterior sun protection.
From the point of view of user-friendliness, it should also be mentioned that the windows can be opened and the ventilation rate can be adjusted to the individual room use. To ensure this functionality, the daylight blinds are positioned at a defined distance from the window so that they can be opened even when the sun protection is down. Overlapping the hangings at the window reveal ensures that the otherwise usual light slits at the edge of the hangings are closed.