, Duration: 16:31*Enlace a Spanish version
Materials: [ IntercConclusionsEnglish.pdf]
This video is, in a way, the conclusion of the tubular heat exchanger/heater case
study discussed in the videos starting with [
It recapitulates the many ways to give a model, from purely “static” (simplest) to nonlinear partial differential equations, through first-order models based on energy balance of the mean temperature.
Excessive model complexity results in computational cost issues, and possibly too complex controllers. Besides, that will never solve problems of unmodeled dynamics (conduction in the metallic piping, turbulence) or parametric errors in heat transfer coefficients, or bandwidth limitations of the instrumentation of a specific application. Therefore, depending on the ratio between the residence time of the fluid and the settling time that is sought in each specific application, the best engineering choice will be a certain “sensible” complexity of the model: more complexity isn’t always better in ‘practical engineering’.
*Link to my [ whole collection] of videos in English. Link to larger [ Colección completa] in Spanish.