The free open-source AixLib library is being developed for research and teaching purposes. It aims at dynamic simulations of thermal and hydraulic systems to develop control strategies for HVAC systems and analyse interactions in complex systems. It is used for simulations on component, building and city district level. As this library is developed mainly for academic purposes, user-friendliness and model robustness is not a main task. This research focus thus influences the layout and philosophy of the library.

Various connectors of the Modelica Standard Library are used, e.g. Modelica.Fluid and Modelica.HeatTransfer. These are accompanied by own connectors for simplified hydraulics (no fluid.media, incompressible, one phase) , shortwave radiation (intensity), longwave radiation (heat flow combined with a virtual temperature) and combined longwave radiation and thermal. The pressure in the connectors is the total pressure. The used media models are simplified from the Modelica.Media library. If possible and necessary, components use continuously differentiable equations. In general, zero mass flow rate and reverse flow are supported.

Most models have been analytically verified. In addition, hydraulic components are compared to empirical data such as performance curves. High and low order building models have been validated using a standard test suite provided by the ANSI/ASHRAE Standard 140 and VDI 6007 Guideline. The library has only been tested with Dymola.

The web page for this library is https://www.github.com/RWTH-EBC/AixLib. We welcome contributions from different users to further advance this library, whether it is through collaborative model development, through model use and testing or through requirements definition or by providing feedback regarding the model applicability to solve specific problems.


Name Description
 UsersGuide User's Guide
 Airflow Package to compute airflow and contaminant transport between rooms
 BoundaryConditions Package with models for boundary conditions
 Controls Package with models for controls
 DataBase Package contains records for the models in the library.
 Electrical This package contains models for electric components such as Photovoltaics or Batteries
 FastHVAC Package contains models for components and components for HVAC components with a high simplification of fluid behaviour.
 Fluid Package with models for fluid flow systems
 Media Package with medium models
 Systems This package contains subsystems which allow a fast modeling of complete systems.
 ThermalZones Models for BuildingPhysics
 Utilities Package with utility functions such as for I/O
 Types Package with type definitions

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