Descripción: “...It was found that the humidity control is possible by increasing the residence time of the grain, allowing the air inlet/outlet flow which induces an ideal temperature for the product. Several non-linear effects of the thermal systems are detected, being necessary approximations in different operating ranges, mitigating those conditions that generate cost overruns to the producer, presenting a system based on a transfer function, to which several tests are performed to know the appropriate point of operation on a real scale, evidenced in the work carried out by a local company in the improvement of its silos for the ecological benefit of cocoa. ...”