IoT-Based Real-Time Control System for Variable Air Volume (VAV) Air Conditioning Using Arduino, Temperature and Humidity Sensor, Actuators, Damper, and Node-RED

Abstract

This research is intended to develop an IoT-based real-time control system for variable air volume air conditioning. This had been built using Node-RED, which provides optimized settings based on collected data from Arduino UNO microcontrollers and DHT11 sensors. The control system targeted supply air temperature and humidity as primary controlled variables that follow the Malaysian Standard MS 1525:2014. It uses Belimo NM24A and LM230A-S actuators for damper position control, providing the system with two-position and modulating control modes. Experimental results show that good air temperature and humidity control have been achieved, with very small power and energy consumption differences between the two modes. It further provides an interface to monitor and actuate the VAV system via the Node-RED dashboard.