MODELLING AND SIMULATION OF REFRIGERATION SYSTEMS WITH THE NATURAL REFRIGERANT CO2

摘要

This paper presents the current results of the development of a Modelica library for CO2-Refrigeration systems based on the free Modelica library ThermoFluid. The development of the library is carried out in a research project of EADS Airbus and the TUHH and is focused on the aim of getting a library for detailed numerical investigations of refrigeration systems with the rediscovered refrigerant carbon dioxide (CO2). A survey of the concept of an integrated cooling system on-board of airliners, the used modelling language Modelica~(TM) and the developed CO2-Library is given and the modelling of CO2-Heat exchangers is described. A comparison with steady state results of heat exchangers is presented showing a very good agreement. The presented transient simulation results show the expected trends, but the models have not yet been validated with transient experimental data.