ME26 has developed a non-invasive, self-powered fault detection system that brings intelligence to older commercial HVAC rooftop units (RTUs) which lack built-in monitoring. Using a single split-core current transformer coupled with four Type-K surface thermocouples, the FD system is able to capture enough electrical and thermal input to determine early-stage fault patterns. Data is gathered from the rooftop unit’s compressor and refrigerant lines without hindering normal operation. A custom multi-parameter FD algorithm, developed with ECE Team 2616, analyzes this data against ideal performance baselines. Continuous deviance from expected operating parameters signify pre-coded faults such as improper refrigerant charge, line restrictions, short cycling, and condenser fouling – issues that often go unnoticed until expensive failures occur. The algorithm is powered by a Raspberry Pi with LTE connectivity. The system offers its users remote monitoring of the continuous data log, as well as instant fault alerts. ME26’s partnership with Hartford Steam Boiler aims to allow proactive control for older commercial RTU’s, which are usually victims of reactive maintenance.

Our team collaborated with Electrical and Computer Engineering 16 on this project.