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A compact heat exchanger analysis of the types frequently used in the automotive and aeronautical industries was performed. The compact finned-tube heat exchanger with flat fins was analyzed in greater depth, since it is widely used in automotive radiators, the main object of the present study. A theoretical model was developed to determine the heat transfer rate and pressure loss for this specific type of compact heat exchanger, through the application of the theory of effectiveness (ε-NUT). Theoretical versus experimental comparisons were made and the obtained results allow us to conclude that the simulations performed are consistent, when the input hypotheses defined as valid for the experiments are assumed. Stopping criteria for iterative processes, for determination of heat transfer rate and pressure drop, use the experimental data of a single available experiment and need to be refined, for better characterization and robustness of theoretical procedure. It is noteworthy that there is a lack of empirical expressions in the open literature, since large corporations, builders of compact heat exchangers, do not provide information obtained in their laboratories, since the data are strategic for the survival.

Análise teórica versus experimental de um trocador de calor compacto do tipo tubo chato aletado (radiador automotivo)