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.
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
If possible and necessary, components use continuously differentiable
equations. In general, zero mass flow rate and reverse flow are
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.
|Package to compute airflow and contaminant transport between rooms
|Package with models for boundary conditions
|Package with models for controls
|Package contains records for the models in the library.
|This package contains models for electric components such as Photovoltaics or Batteries
|Package with models for fluid flow systems
|Package with medium models
|This package contains subsystems which allow a fast modeling of complete systems.
|Models for BuildingPhysics
|Package with utility functions such as for I/O
|Package with type definitions
|Classes that are obsolete and will be removed in later versions