From Lotka to the entropy generation approach

The entropy approach to the evolution of open systems is analyzed, using Lotka’s principle as a starting point. A Lagrangian is sought after to develop an analytical method for the evaluation of the stationary states of open irreversible systems. The stationary conditions for open systems are first obtained on the basis of the entropy generation and its maximum principle, suggesting them as a link between the classical engineering thermodynamics approach and the more mathematical Lotka point of view.