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A heat exchanger, which may be found in cooling systems, refineries, power plants, and other facilities, is one of the frequently utilized devices in the application heat transfer process. Water, mineral oil, and ethylene glycol—which has poor heat transfer characteristics—were the typical fluids utilized in heat exchangers. Hence, nanofluid was employed to enhance the fluid's ability to transport heat in heat exchangers. The issue of enhancing heat transmission in heat exchangers with nanofluid was researched experimentally, theoretically, and experimentally. Some of the research done in this area is as follows.