6. Conclusion

The heat exchanger plays a fundamental role in all existing systems, since heat is omnipresent due to its specific nature. The need to model the unsteady behavior of heat exchangers arose very early, with regenerators.

The advent of computer-aided complex calculations has considerably broadened the range of available models, from unsteady 3D models to unsteady global (0D) models, and even black-box models that identify the relationship between an output variable and an exchanger input variable (automatician approach).

The use of models always involves a compromise between the time required to run them (set-up and calculation) and the precision required (agreement of the reduced model with experience). To simplify matters, we can say that knowledge models are dedicated to simulations based on models that take into account the determining...