Siemens Headquarters, Munich, Germany

The Siemens Headquarters forms a city block with a total of 6 incised courtyards - two covered inner courts exclusively for Siemens, the remaining four courtyards, including the ground floors are accessible to the public. The new building will be a showcase for sustainable and innovative construction; eco-friendliness and energy efficiency play a key role. For the project, Siemens has set the highest sustainability goals - a certification in Platinum LEED & DGNB.
The EU Buildings Directive 2010/31/ EU "European Directive Energy Performance of Buildings" (EPBD) calls for all new buildings from 2020 to be so-called zero-energy buildings. Therefore, an annual primary energy balance of less than 50 kWh / m² has already been specified as a planning goal.
The heating system is based on district heat by the municipal utilities of the city of Munich - generated by cogeneration and geothermal heat pumps, which is favorable in terms of primary energy. The cooling is done free through cooling towers or indirectly through groundwater via a thermally activated floor plate that stores cooling load peaks in summer and serves as a low-temperature source for heat pumps in winter.
To verify the functionality of the complex supply system for heating and cooling a combined building and plant simulation model was set up in the software TRNSYS 17. Relevant system states have been defined and control algorithms (functional sequence diagram) have been developed for this simulation. The result are time series of thermal performance and energy balances as well as the frequency of system states which are used as input for the dimensioning of the components and the functional description of the building automation.
A high thermal comfort in accordance with KAT I-II (DIN EN 15251) is predicted for all rooms as well as a primary energy balance of less than 40 kWh / m² for the entire new building with roof-integrated solar power system.