Monitoring heat exchanger performance is crucial to profitability and sustainability as the inefficiencies introduced by fouling may result in increased energy consumption, GHG emissions, and/or production loss. Amongst other parameters, process duty, overall heat transfer coefficient, or fouling resistance can be used for monitoring fouling in heat exchangers. At Suncor, AVEVA Process Optimization (ROMeo) is being used to continually collect raw field data and transform the obtained raw data to abovementioned engineering metrics. Calculated values are then historized and used for further analysis to determine the optimum cleaning time. The simulation can also be used for conducting case studies to estimate the plant maximum processing capacity at a reduced performance. This information can assist Operations and Maintenance teams in making data-driven informed decisions.