The WGV Insurance Group has been based in Stuttgart for more than 100 years. In the middle of the city center, a modern new building now replaces the previous post-war building. In addition to numerous offices and open-space areas, the new headquarters houses the heart of the WGV: a stylish customer service center with a showcase character. Kiefer Klimatechnik was jointly responsible for the planning of system components and structural elements for ventilation, fire protection and smoke extraction technology - as well as for their complete installation. Energy-efficient air conditioning ensures optimum, draught-free room air flow and the well-being of customers and employees.
The new headquarters of WGV Versicherung merges innovative building technologies with sustainable design principles. Spanning six floors and over 7,300 m², the new building designed by wma architekten accommodates 230 workspaces. Three basement levels provide space for two underground parking areas, technical facilities, storage rooms, and bicycle parking with changing rooms. The ground floor houses the new customer service center, designed by DIA DITTEL ARCHITEKTEN to complement the new building. It serves as the company's calling card, showcasing a comprehensive and stylish design concept: modern, forward-thinking, and sustainable.
The service center is organized into three functional zones over 600 m², allowing for a dynamic circulation from the reception area through the waiting space to the consulting stations. Enclosed rooms for meetings and focused work complement the open service area. In line with the company's guiding principles and long-term use, the materials chosen are durable, high-quality, and timeless in appearance. A continuous bright terrazzo floor adds an elegant touch and contrasts strikingly with the warm oak wood slats that semi-transparently frame the consulting areas. Petrol-colored accent seating islands reference the corporate identity and, along with integrated planting, create visual highlights in the organically structured space. The light wall and ceiling colors are echoed in the furniture. At the same time, the high-quality acoustic ceiling supports the zoning and pathways within the customer center through the design of ceiling panels over the various usage areas. In areas with heightened acoustic requirements, high-quality acoustic ceiling panels and elements ensure a pleasant room acoustics. The finely tuned combination of architecture and design creates an attractive and comfortable spatial ambiance for both employees and clients. A sophisticated ventilation and climate control system, designed by Kiefer Klimatechnik, also significantly contributes to this.
The plant concept for the new headquarters is based on three pillars: The ventilation system consists of a central ventilation unit installed in the technical center in the basement, which supplies the various building areas. Additionally, three other systems are primarily dedicated to ventilating the underground parking garage and smoke extraction in the basement.
The first ventilation system, equipped with heat recovery, is responsible for both ventilation and air conditioning. It services the customer center on the ground floor as well as all office, ancillary, and sanitary areas across the five floors. Outdoor air is drawn in through an intake tower in the courtyard, filtered, and then fed into the ventilation unit. Depending on the needs, the air is either cooled or heated using a high-performance heat recovery system. The conditioned air is then distributed to the respective floors via installation shafts. At each floor entry, the volume flow is regulated by variable volume flow and pressure controllers.
The supply of fresh air to the office and consultation rooms in the customer center is managed through INDUL linear diffusers. These diffusers are equipped with volume flow limiters that balance the air volumes of each diffuser to a defined set point, which in this case is 125 m³/h. A key feature of these high-quality linear diffusers is their specially designed discharge geometry, which creates particularly fine individual air jets. This design facilitates rapid induction, meaning the air mixes quickly with the room air, thus minimizing temperature differences and avoiding uncomfortable drafts. The slim profiles of the diffusers blend seamlessly into any desired ceiling architecture. In this instance, they are integrated as a continuous band along the window front in the customer center. Additionally, one diffuser is placed in the ceiling of each consultation room, aligning with the arrangement of partition walls and furniture.
Exhaust air is collected in the customer center through a discreet shadow gap in the illuminated ceiling area above the seating islands and reception counter. The used air is channeled into the corridor ceilings and then directed to the ceiling void of the corridor box. From there, it is extracted through an intake point at the floor level, filtered if necessary, and fed into the central unit. In the restroom and ancillary areas, the exhaust air is handled via circular vents or grilles in the ceiling void. After passing through the heat recovery system, the exhaust air is expelled through the roof.
In the office floors of the upper levels, including open-plan work areas, INDULSNAP wall air passage were selected for both supply and exhaust air. The proven INDUL discharge profile combines high performance with great comfort. INDULSNAP also functions as a wall-mounted air diffuser with an integrated cross-talk silencer, completely concealed within the drywall – ensuring focused work and a pleasant conversational atmosphere. To further reduce fan noise, absorption silencers are installed in the various ducts and pipes as well as in the ventilation unit.
Two additional systems are integrated into the ventilation of the underground parking garages, while another is designated for smoke extraction in several rooms of the basement. The exhaust fans for the parking garages are located on the second and third basement levels. Exhaust air is drawn from the parking garage through duct grilles and expelled to the outside via vertical ducts leading to the roof. Fresh air flows in through the entrance ramp. Fire dampers with electric spring-return actuators are installed where walls or ceilings are penetrated by ducts in fire-rated sections. In the event of smoke detector activation or a fire alarm, the system shuts down, and the fire dampers close.
Within the smoke extraction system, each relevant area on the first basement level is equipped with a smoke extraction damper. Smoke is extracted through connected ducts via vertical shafts to the roof, where it is expelled by a smoke extraction fan. From the fire alarm control center, the fire department can activate one of ten smoke extraction zones, which automatically opens the respective damper and starts the roof fan.
Object: | WGV Versicherung, Stuttgart |
Proprietor: | Württembergische Gemeinde-Versicherung a.G. |
Technical Planner: | Rentschler und Riedesser, Filderstadt |
Architect: | wma architects wöhr mieslinger associated, Stuttgart |
Products: | INDUL linear diffusers typ AV45, AV24, AP15, AP18, AP24 |
Plant engineering: | HVAC systems for 7,300 m² of conditioned area including common areas and office units |
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The supply air is divided into fine individual jets which distribute the supply air into the room at an angle of 45° alternately to the left and to the right. The result is an especially uniform air distribution with an optimal diffuse ambient air flow, and no noticeable draughts.
Kiefer Klimatechnik GmbH is a leading company in the field of ventilation, air handling and air conditioning technology. Our range of services includes consulting, planning and execution of systems for thermal comfort and industrial air conditioning, as well as the associated installation and maintenance. For almost four decades, Kiefer has also been selling high grade ventilation components worldwide, such as linear diffusers, wall passages, displacement outlets, light and acoustic sails, chilled ceiling panels and concrete core cooling systems, developed in the company's own laboratories.
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