Thermal system oriented heat exchanger models. Focus on moist air liquid cooled units with dehumidification

摘要

The simulation of complex thermal systems including an increasing number of components, andspecifically heat exchangers, is still attracting the attention of the researchers, both to reduce thetime needed for the resolution and to improve the accuracy for such simplified models. In the heatexchanger field, simplified models are typically based on semi-analytical methods such e-NTU (forsteady state analysis), or by using single volume transient models (with strong limitations to covertemperature crossing within the exchanger). The current paper describes the work of the authors inthe development of simplified models for heat exchangers under the Modelica platform, trying tofind a compromise between accuracy in steady state conditions, while maintaining the transientresponse of the component. In this case, the focus is given to liquid cooled air heat exchangers inan aircraft application, where the water condensation on the airside is of importance tocharacterize the performance.