Air Conditioning Library

Air conditioning cycle templates 1
Air conditioning cycle templates 2
Detailed heat exchanger models

Wide range of AC cycle templates: vapour cycle, fixed orifice, CO2 cycleExtensive range of working fluids: R1234yf, R134a, CO2Detailed heat exchanger models: geometric definition with material properties


The Air Conditioning (A/C) Library allows the user to model full A/C system circuits from early design stages through to control algorithm development and system implementation. The Dymola A/C library is the standard model exchange tool for the majority of German Automotive OEMs and their suppliers.

Dymola’s multi-domain engineering capabilities mean that the A/C system model can be fully integrated into a vehicle model and also be coupled to libraries which model human comfort in particular environments.

The library includes a wide range of commercial refrigerants all of which are validated and ready to use. Template based experiments make it quick and easy for the user to analyse a variety of systems.

Key Features
A/C System Design
    • Transient and steady state simulation.
    • Includes all relevant working fluids such as R1234yf, R134a, CO2, R404a, R410a and many more.
    • Easy to use templates of AC cycles.
    • Reduced time and cost for testing.
    • State of the art models with access to the Modelica source code.
    • Seamless integration of user-defined models.
    • The German automotive manufacturers, Daimler, BMW, Audi and Volkswagen, all use Dymola and the Air Conditioning library as a tool for model exchange and simulation of automotive air conditioning systems
    • Several Tier 1 automotive A/C equipment manufacturers are using the Air Conditioning Library for their internal development and model exchange with the OEM.
    Air Conditioning Library
  • The Air Conditioning Library features an open, object-oriented architecture with access to the model source code in Modelica. Template models of typical automotive A/C-cycles and dialogs with detailed graphical information about the components make the library convenient and easy to use.

    Users can connect components freely as they desire and redesign or create their own templates, which makes it is easy to realize non-standard configurations such as parallel evaporators. The modular, hierarchical structure of the library enables power users to integrate their own correlations and component models seamlessly into their system models.

    For hybrid vehicles of all types, electrically driven compressors are discussed as a possibility for improving the overall energy management and reduce the
    fuel impact of the A/C-system. Dymola lets you combine the electric drive and its control from the Smart Electric Drives Library with a cabin model from the Human Comfort Library and A/C-cycle from the Air Conditioning Library. Cooling of batteries for all types of hybrid vehicles can also be modeled and integrated with the A/C system.

    Air Conditioning Library
  • The Air Conditioning library is applied by Automotive OEM’s and their suppliers to investigate many different aspects of the Heating, Ventilation and Cooling (HVAC) systems.

    • Air conditioning systems cycle performance and sizing in both steady state and transient situations.
    • Air conditioning system component performance and sizing in both steady state and transient situations.
    • Refrigerant type related system performance analysis.
    • Also covers battery cooling applications.
    • Heat exchanger modelling and calibration to CFD analysis results
    Air Conditioning Library Application
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