Implementación de un módulo didáctico para analizar al calentamiento y humidificación del aire para el LTI - ESFOT.

Abstract

The objective of the present project was to implement a didactic module to analyze air heating for the Laboratorio de Tecnología Industrial-ESFOT, in order to complement the knowledge acquired in the course: Refrigeración y aire acondicionado. To heat air to temperatures between 35 and 45 (°C) given a minimum volumetric air flow of 0,02 (m3/s), a heat rate of approximately 500 (W) was required. Given the maximum temperature and humidity, the sensor proposed to measure these physical quantities was the DHT22. To achieve an adequate sensor conditioning, an Arduino UNO board was used which, through a programming code, allowed taking the value measured by the sensors and displaying them on an LCD screen. The 3D modeling of the module allowed determining the necessary elements to guarantee its correct operation, the most important ones being acrylic duct, wooden structure and heater. It was identified that the sensors stabilize within 3 to 5 (min) and despite 35,2 (%) heat losses, the system reaches maximum temperatures of 47 (°C). It was demonstrated that, during the addition of heat, the specific humidity of the air remains constant, which produces an horizontal line when plotting the points on the psychrometric chart, but when plotting the values measured by the sensors, at 40 (°C) there was a small margin of error, so that the straight line in certain cases presents a slight inclination.