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This paper introduces the work and application of the Modelica IBPSBuilding package which has been developed at TU München. The aim of the package is to simulate building energy performance, especially the thermal behaviour of buildings. Its application is focused on research and education in order to help applicationoriented researchers and students to understand the physical processes of a building performance simulation and gain persuassive simulation results. The package describes all basic processes including conduction, convection, radiation and ventilation, and it is validated with German VDI-Guidelines.

The real estate sector is responsible for 40 percent of the energy consumption and one third of the CO2 emissions in Europe. Moreover one third of the European Union’s buildings are in fact older than 50 years while only one percent is being renovated each year. The building stock is therefore of great importance for the European Union in order to achieve its climate targets not only for 2020 but also long term. The difficulty however is to decide where and how to realize energy savings in the most efficient and economical way – especially for property owners with a large and heterogeneous building stock. This paper provides a simplified analysis method to evaluate real estate portfolios and estimate their buildings’ saving potential. This method has been integrated into AiBATROS®[1] software and can help to prioritize measures increasing energy efficiency. Verification and validation of the process are demonstrated comparing results with another method’s energy calculations.

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