Green buildings do not just result from stringing together a series of highly efficient products and only using sustainable building materials but rather by intelligently combining innovative structures made from recyclable materials and multi-functional building technology. One of the most up-to-date examples in the green building range is the new Süddeutscher Verlag HQ in Munich, which has been awarded with a LEED certificate in gold as first office building in Germany a few days ago.
In conjunction with a multi-functional automation of the room functions, the innovative facade fulfills the requirements for minimization of the building's energy consumption. A novelty: employees can choose freely between manual and automated operation of heating, ventilation and cooling.
The principal's requirements for the new Süddeutscher Verlag headquarters (SV) on the East side of Munich remind one of the difficulty of squaring a circle. On the one hand, the building and building technology systems should be able to react flexibly to the rapid changes in the publishing and editing industry, but on the other hand a third-party usability of the building and the possible rental of individual stories had to be taken into consideration by the architects and planners. An important part of the planning was the development of an energy concept that went beyond the EnEV Energiesparverordnung (Energy Conservation Guidelines) valid at the time and met the principal's particularly high noise insulation requirements.
Along with a three-layer facade, the heart of the building and energy concept designed specifically with sustainability in mind is a geo-thermal heat pump that accesses the energetic storage potential of the earth via 36 thermally active pile foundations for heating and cooling purposes.
This is complemented by the option of being able to use the building's storage capacity for night-cooling processes.Heat is primarily sourced from internal heat loads, solar radiation and individual window ventilation and is used for room temperature control by concrete core activation. First experiences show that the internal thermal load is sufficient to keep the building at a comfortable, individually adjustable temperature into the winter. And what is more, all employees in individual offices can decide for themselves whether they wish to manually control the temperature using the window ventilation system integrated in the double facade or whether want to entrust this to the automated air-conditioning system with closed windows. Fundamentally, room regulation functions without the user having to do anything because the presence detectors integrated in the acoustic ceiling panel not only (de)activate daylight-dependent lighting but also (de)activate the facade-oriented ventilation system. The windows are also connected to the room automation system via contacts, meaning that as soon as a window is opened, the mechanical ventilation in that room is switched off.
Behind the scenes, a total of 1,730 Desigo ACX LON individual room regulators from Siemens work via an individual, physically separate TCP / IP data network with the higher level Desigo BACnet building automation system. A total of 22 Desigo PX automation stations are installed for the connection of the two climate control units, "north" and "south", as well as the "heating", "air-conditioning, "sanitation / sprinkler" and "underground parking exhaust air" control units. The high synergy effects between climate-friendly construction, decentralized, demand-driven room functions and multi-functional regulation strategies were one reason why the general planners, CBP Consulting Engineers, Munich, suggested that the principal apply for the gold level LEED (Leadership in Energy and Environmental Design) building certification. At the certification a few days ago the building reached 42 points; to achieve a gold status, 39 points are necessary. The LEED certification is a product of the U.S. Green Building Council (USGBC), an American non-profit organization. The award acknowledges the sustainability of buildings within a rating system.
Intelligent evacuation strategies
Whilst the building automation system constantly adjusts the building technology systems to the heating, ventilation and air-conditioning systems' demand and optimizes energetic efficiency, the hazard management systems from Siemens are working the background. The GMA manager Topsis is the central control and observation location via which fire alarm systems, intrusion detection systems, video systems and alarms generated by electro-acoustic systems (ELA) can be visualized, controlled and monitored.
A total of approx. 3,000 intelligent fire detectors and 120 aspirating smoke detectors in the double floors and suspended ceilings provide early and safe detection of smoke and fire. An additional 350 push-button fire alarms that alarm the fire department immediately when activated by an employee and approx. 800 control contacts for the implementation of the specified fire protection concept with the assembly sections involved. Whilst the approx. 2,700 loudspeakers on the corridor walls of the offices primarily inform employees in the offices of evacuation procedures and strategies at a minimum volume of 75 Decibel, special loudspeakers are installed in the foyer that can also be used as an auditorium. Evacuation instructions can still be clearly understood even in rooms with hard surfaces (glass) and high background noise due to their special directional features. In order to avoid panic reactions and unnecessary evacuations, selective alarms are only made via the ELA system in the section where a fire alarm is triggered and the floors directly below and above.
Non-glare light for flexible desks
The customer's high demands for room flexibility, ergonomics, energy efficiency and economic feasibility led to the installation of multifunctional suspended ceilings for lighting in the offices that combines acoustic, design and functional aspects. A suspended ceiling was developed that seamlessly integrates an acoustic function in which lighting, presence detectors and sprinklers are seamlessly integrated. The project-specific lighting is distinguished by a non-glare feature achieved using Eldacon micro-prism technology in the cover. This means that desks can be flexibly positioned in a room without creating shadows or glare. A corresponding dimmer function allows predominant use of daylight, thus saving energy.
The high energy efficiency of the lighting concept - a total of 3,000 such lights are installed - is provided primarily by the Quicktronic Dali Dim (QTi Dali) electronic control gear from Osram that also enables flexible allocation of a lighting group to a switching element. An important USP of the QTi-Dali electronic control gear is the cut-off technology that deactivates the pre-heating of the lamp filament between 100 and 80 percent luminous flux as soon as the optimum operational level of the light is reached. In comparison to conventional electronic control gear, savings of around eight percent can be made on luminous flux.
Self-explanatory media technology
The great flexibility of modern systems and the advantages of multi-functionality of lighting and security technology is also demonstrated by the media technology. One example is the conference area on the first floor that within a few minutes can be split up into four smaller rooms each with complete AV technology using four mobile dividing walls. The evacuation system's loudspeakers are integrated in the audio system. In the event of a fire alarm or another evacuation measure, the media system's sound is turned off so that a high-priority alarm message can be heard. All control and switching functions are configured in such a way that the control of systems i