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AixLib is an open-source Modelica model library for building performance simulations ( It is being developed at RWTH Aachen University, E.ON Energy Research Center, Institute for Energy Efficient Buildings and Indoor Climate (EBC) in Aachen, Germany.

It contains Modelica models for the building envelope and HVAC equipment such as boilers, radiators, heat pumps and CHPs. Emerging out of the institute’s needs in research and teaching, AixLib contains models at different levels-of-detail. In particular for building envelopes, it contains models focusing on the single building scale (High Order Models) and for neighborhood or urban scale applications (Reduced Order Models). The library extends the collaboratively developed Annex60 library (, which focuses on basic models. AixLib is available under the Modelica license 2.0.

As the library is developed at RWTH Aachen University's EBC, the library's name AixLib is derived from the city's French name Aix-la-Chapelle, which the people of Aachen are very fond of and use a lot. With the name AixLib we follow this local tradition.

If you have any questions regarding AixLib, feel free to contact us at .

Parts of AixLib have been developed within public funded projects and with financial support by BMWi (German Federal Ministry for Economic Affairs and Energy).

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