Sistema de coleta de água proveniente de condicionadores de ar para suprimento de planta didática industrial

Abstract

This work presents the development of an automated system for the collection, storage, monitoring, and control of condensed water from air conditioning units, aimed at its use in the periodic renewal of water in an industrial didactic plant. The proposal arose from the observation of damage caused by the continuous use of treated tap water in the didactic plant, including corrosion in metallic connections, scaling on sensors, and component failure, motivating the replacement with a fluid of lower chemical aggressiveness. The system was developed using an ESP32 microcontroller, an AJ-SR04T ultrasonic sensor, a DS18B20 temperature sensor, a YF-S201 flow sensor, float-type level sensors, a peripheral pump, solenoid valves, and a relay module. The embedded software performs continuous reading of variables, volumetric dosage control, critical level detection, flow failure verification, and data updates on a 20×4 LCD display and on the Blynk IoT platform, enabling local operation and real-time remote supervision. The average total condensed water production flow rate measured was 4.82 L/h, with an estimated monthly production of 1,272.48 L. Comparative physicochemical analysis demonstrated that the condensed water presented 53% lower electrical conductivity, a complete absence of residual chlorine, and a silica concentration 99.5% lower than that of tap water. The system demonstrated technical feasibility for the reuse of condensed water, contributing to the reduction of water waste, the preservation of plant components, and the practical application of industrial automation, electronic instrumentation, and Internet of Things concepts in an academic environment.