PSD Bank

PSD Bank

Awarding Agency: PSD Bank RheinNeckarSaar eG

Time Frame: 2012

Program: Office / Corporate

URBAN CONCEPT

The site for the new PSD Bank office building lies in the heart of the Saarbrücken city center, on Bahnhofstrasse at the corner of Sulzbachstrasse. Bahnhofstrasse was developed several decades ago as a pedestrian zone to unite the two major commercial centers of Saarbrücken. The northwest of the avenue connects to the Hauptbahnhof with the new "Europagalerie", a shopping mall, and a district of bank, insurance, and office buildings; the southeast to "St. Johanner Markt" with small shops, restaurants and the offices of public institutions.

Bahnhofstrasse is a classic German shopping street whose 1950s origins are apparent as most of the buildings on Bahnhofstrasse, with a few notable exceptions that date back to the 19th century, are postwar and do not reference vernacular architecture. Bahnhofstrasse has another unique feature: the ground levels of all the buildings are pushed back about 5 meters, forming covered colonnades on either side of the street. A distinct urban motif is created, defined by two distinct functional zones; on the ground level an entrance area with large glass display windows and the second zone on the 4th and 5th floors, where sales, administrative and storage space is located, having little relation to the exterior. The entire character is completed with advertising and other signage on the facades.

CONCEPT

The design and structure of the individual buildings on Bahnhofstrasse is very unique, in part due to the year of construction, degree of renovation or use. In addition, many building facades are subject to corporate identity standards of particular brands and/or companies, which do not take into account the building context, making a homogenous streetscape nearly impossible. Bahnhofstrasse appears chaotic, overloaded and random from these features, the eyes finding no quiet moment or distinct place to orient themselves.

This is exactly what the new PSD Bank building shoud become for the street an orientating fixed point. Given its privileged location on the corner of Sulzbachstrasse, the building is quite visible even from far away. It forms a capstone and an anchor for the row of buildings on Bahnhofstrasse. The building takes on the banding of the nearby buildings and disrupts the long side of Sulzbachstrasse. On the ground level, large clear glass windows offer an optimal contact to the streetscape and pull the interest into the interior of the bank building. The upper levels have a double shell glass facade: an interior insulating plane and an outer glass plane with large, scattered elements printed on the glass that give the building a monolithic and elegant presentation. Similar to the appearance of a crystal or a diamond, the building's transparency and status exudes stability and durability.

ENERGY CONCEPT

The transparent, thermal building shell allows for a flexible facade, that may be adjusted seasonally and reacts to daily environmental changes.

Provided by the outer, simply glazed weatherproof area of the facade is a combination of sun protection and daylight control system. Independently controlled solar radiation through deflection or reflection affords an optimal, glare free daylight utilization.

As a result of the smooth reinforced concrete ceilings on the interior, daylight penetrates deep into the building. To save electricity and reduce internal heat, artificial light controls adapt to daylight.

The thermal conditioning of the building shell takes place through the individual component activitation, the concrete ceilings are kept open at the bottom, serving both heat and cooling.

The city's heating network serves as the thermal heat producer for the building.

The building's ventilation system makes use of both excess waste heat from the building and heat produced on the facade in a system of heat recovery. In, through bypass switching and increased nocturnal air exchange, the storage capacity of the ceilings for cooling may be used.

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