Dynamic Model for Reboiler

There is one heat-exchanger model in the standard model that considers heat-exchanger dynamics, but is only available for the reboUer. The Dynamic model uses the holdup of the 

However, this model can only be realistically used when the reboiler heating medium is a hot liquid stream, and the holdup of this liquid on the shell or tube side is significant. If the reboiler is heated with a condensing vapor, which is much more frequently the case, this dynamic model is not applicable. 

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