Two main cooling systems are installed in a modern passenger aircraft. An air cycle system controls the temperature in the fuselage taking care of the heat loads generated by passengers, electronic equipment and solar radiation. A second cooling system is present to remove heat from the installed galleys to meet the required temperature for storage of food and beverages. The development of this system towards weight reduction and efficiency optimisation has become more relevant in the last decade caused by rising health, comfort and reliability demands. This results in increased complexity and performance requirements. In this paper a direct-evaporating CO2 system for galley cooling is discussed using a non-linear model written in the language Modelica. A transient numerical model offers the opportunity to investigate the direct CO2 evaporating system in conditions which cannot be adjusted at the test rig. As shown in this paper low temperatures and temperature changes can be investigated having the possibility to see all parameters also in the components like quality distributions and mass. Moreover intensive parameter studies to get for example a characteristic diagram for the COP can be performed. The charge level study has the great advantage that the change of the discharge temperature at the compressor can be investigated before experimental studies take place. Effort has to be put in some numerical issues. The simulation of the presented 3 consumer model has required some time to find for example the correct discretisation to get correct results on the one hand and a stable model on the other hand. The simulation around the critical point of CO2 is still a problem.
Transient simulation of a direct-evaporating CO2 cooling system for an aircraft
Instationäre Simulation eines direkt verdampfenden CO2 Kühlsystems für Flugzeuge
2006
8 Seiten, 16 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
TRANSIENT SIMULATION OF A DIRECT-EVAPORATING CO2 COOLING SYSTEM FOR AN AIRCRAFT
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