IoT system for monitoring the performance of a water spray evaporative cooler
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Data
2026-05-20
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Universidade Federal do Oeste da Bahia. Centro Multidisciplinar de Bom Jesus da Lapa
Resumo
Abstract. Climate adversities at Brazil's semi-arid drive the search for solutions to mitigate its impacts. Bom Jesus da
Lapa faces temperatures exceeding 40°C and low relative humidity, conditions that intensify thermal discomfort in urban
spaces. To address this challenge, a water spray cooling system based on direct evaporative cooling was developed. To
validate the system’s efficiency, this study aimed to construct a data acquisition system alongside a robust sensor network
around the cooling device to monitor the environment affected by water spray, collecting data on temperature, humidity,
wind speed/direction, and spray pressure. This research proposes a high-density sensory measurement system capable
of validating the cooling device as a solution for urban thermal comfort. The work details the designed IoT monitoring
system, emphasizing instrumentation and precise recording of sensory data. The instrumentation integrated 25 SHT31
temperature and humidity sensors (24 radially positioned around the system and 1 external reference sensor), a cup
anemometer, a wind direction indicator, and a pressure transmitter. Data acquisition was ensured by two
microcontrollers: an Arduino UNO, responsible for reading the pressure sensor, and an ESP32, tasked with
communicating with digital/anemometric sensors and Wi-Fi transmission. Both were integrated into dedicated printed
circuit boards. Management of the 25 SHT31 sensors was managed by two I²C multiplexers (TCA9548A). The SHT31
sensors were protected against moisture and solar radiation, with calibrations ensuring data reliability (±0.2°C for
temperature and ±2% for humidity). Data, collected every 10 seconds on the Arduino and 3 seconds on the ESP32, were
transmitted via HTTP GET to a spreadsheet using Google Apps Script. The system demonstrated efficiency in data
organization and transmission, even under direct sunlight and ambient temperatures exceeding 45°C. The monitoring
system stood out for its low cost (due to dual addressing of digital sensors) and scalability (enabled by I²C multiplexers).
Descrição
Trabalho de Conclusão de Curso intitulado “IOT SYSTEM FOR MONITORING THE PERFORMANCE OF A WATER SPRAY
EVAPORATIVE COOLER”, como requisito curricular indispensável para a integralização do
Curso de Graduação em Engenharia Mecânica.
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Citação
V. N. Macedo, M. F. O. Assis, H. A. Vasconcelos, A. I. Sato, I. Lopes IoT system for monitoring the performance of a water spray evaporative cooler