Diseño e implementación de un sistema instrumentado para monitorear el balance energético en un módulo didáctico de compresión de dos etapas en el Laboratorio de Termodinámica de la Facultad de Mecánica de la Escuela Politécnica Nacional

Abstract

In the Thermodynamics Laboratory of the Faculty of Mechanics, there is a two-stage compression module for high and low pressure. The main objective of the practical procedure was to analyze the energy flow in both compressors considering the main losses in the whole system due to the heat exchangers, and the mechanical and electrical elements. An instrumented system was designed and implemented to monitor the energy balance of the compression system. This will allow to run monitoring tasks and to obtain diagrams which will facilitate the analysis of the operation of each compressor. Power supplies were designed and installed for the control, sensor and power stages. The installation and assembly of sensors is done to measure the different variables involved in the calculation of the energy balance and for each sensor a conditioning circuit was designed. The control program for the master and slave devices was developed in order to acquire and process the different variables of the compression system. A human machine interface was developed to monitor the system and to generate PV and Sankey diagrams. In addition, an interface was developed on a touch screen to control the electrovalve that regulates the air tank pressure.