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In this work an optimal control technique is applied to control the excess air in the combustion process of a reverberatory furnace by the monitoring of O2 percentage in the stack, the controller is designed based on a nonlinear model estimated by artificial neural networks and a data base is used for the previous training; the data base has two subsets one for training and other to validate the net.

This work is a review and analysis of the state of art of mechanical technologies for the coffee drying and potential actions to increase the efficiency. Also, it describes the importance to use alcohol as fuel, which could be obtained from subproducts of the humid benefit process of the grain, pulp and mucilage; this could be an option to improve carbon dioxide and particles emissions in comparison with conventional mechanics drying systems in Colombia.

This work is a review of the characteristics of the combustion using highly preheated normal air. The technology has been used in the last years to provide an increase in the thermal efficiency and a significant decrease in the consumption of fuel and polluting emissions regarding the conventional combustion systems. The combustion with enthalpy excess concept is presented, and also the main combustion properties that are affected by there active preheated, the systems more used to preheat the air, the advantages and disadvantages of this technology and some computational technical.

La necesidad de apropiar tendencias tecnológicas de última generación en equipos de combustión con aplicaciones en el sector productivo nacional, despierta el interés por estudiar los parámetros de diseño, optimización y caracterización de nuevos sistemas térmicos. En este artículo se presenta un método para el análisis de procesos de calentamiento con tubo radiante. El modelo se ha desarrollado planteando algunas hipótesis que ayudan a la caracterización de los parámetros mas influyentes involucrados en su funcionamiento y tiene como objetivos servir de guía en la etapa de diseño en aplicaciones industriales y ser una herramienta adecuada para la selección de un sistema de combustión con tubo radiante

The need for adopting the latest technological tendencies in combustion appliances, which have potential applications in the national industry, gives rise to an interest in studying the parameters of design, optimization and characterization of new thermal systems. A method for the analysis of heat transfer processes involving radiant tubes is presented in this article. Some hypotheses used in the development of the model considered helpful for the characterization of the most influencing parameters involved in the model are presented. The model attempts to serve as a guide during the design phase in industrial applications, and to be an adequate tool for the selection of a combustion system with radiant tube.