"Waste heat recovery in industrial processes is an important strategy for improving energy efficiency and reducing environmental impacts. In this study, we evaluated the feasibility of waste heat recovery in nocolok furnaces used in aluminum heat exchanger brazing. We first calculated the mathematical potential of waste heat recovery and then used computational fluid dynamics (CFD) simulations to identify the most effective arrangements for recovering and utilizing waste heat. Our results demonstrate that waste heat recovery is indeed feasible in this context, and that the optimal arrangement for recovering waste heat involves a heat exchanger located downstream of the combustion chamber. Furthermore, we found that after the implementation of waste heat recovery, the consumption of piped natural gas (PNG) decreased from an average of 28,000 SCM per month to 21,500 SCM per month, resulting in significant cost savings for the organization. This waste heat recovery system could also reduce greenhouse gas emissions. Our study provides valuable insights for companies looking to improve the energy efficiency of their industrial processes and highlights the importance of carefully evaluating the potential for waste heat recovery in specific contexts."