Constructal law in technology, thermofluid and energy systems, and in design education: comment on "The constructal law and the evolution of design in nature" by A. Bejan and S. Lorente.

It has been said many times in one form or another that there is nothing more understandable and practical than a simple theory. As engineers and scientists, we are always looking for a simple theory, law or equation in every engineering science to explain behaviours and to use as design tools. Examples of such simple theories are Bernoulli’s law in fluid mechanics [1], the first and second laws in thermodynamics [2], Fourier’s law in conduction heat transfer [3] and Newton’s law for convective heat transfer [4].