Publication

Abstract : Usage of ductless split conditioners inside built environment has seen a significant rise in tropical countries like India, as they provide thermal comfort. However, the absence of fresh air ventilation in ductless split conditioners has resulted in scenarios of CO2 concentration above the ASHRAE threshold limit of 1000ppm for better indoor air quality and health. The study demonstrates the working principle of an IoT based automated system to provide ventilation during required periods to maintain better indoor air quality in an office type workspace. An Arduino Uno with wifi module measures the CO2 concentration through a CO2 sensor connected to it and transfers the data onto an online platform for data logging. Once the CO2 concentration attains the upper limit, the system triggers the exhaust fan to provide fresh air ventilation until the CO2 concentration decays to a preset lower limit. The results indicate that the automated system can be implemented to measure and maintain the average CO2 concentration below 1000 ppm over a period of 8 hours.