In automobiles thermal energy is used at various energy scales. With regard to reduction of CO 2 emissions, efficient generation of hot and cold temperatures and wise use of waste heat are of paramount importance for car manufacturers worldwide. Thermoelectrics could be a vital component in automobiles of the future. To evaluate the applicability of thermoelectric modules in automobiles, a Modelica model of a thermoelectric liquid-gas heat exchanger was developed for transient simulations. The model uses component models from the object-oriented Modelica library TIL. It was validated based on experimental data of a prototype heat exchanger and used to simulate transient and steady-state behavior. The use of the model within the energy management of an automobile is successfully shown for the air-conditioning system of a car.
Results of numerical simulations more and more provide a basis for design decisions in an automotive context. When simulating complex systems, one of two approaches can be chosen: The modeling in one multidomain language like Modelica or the utilization of different specialized simulation programs.This paper demonstrates the simulation of the Heating Ventilation and Air-Conditioning system (HVAC) of a car. The different components are modeled individually and validated with measurement data in separate test benches. A co-simulation using one Dymola instance per component model is then created to represent the whole refrigeration cycle taking into account the inter-component dependencies.To evaluate the effects introduced by the tool coupling, the results are compared to those of a single Modelica model composed of all component models.
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