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Abstract: For many years, large-scale commercial enterprises have been interested in thetreatment of waste heat. This recovery not only makes an operation more environmentally friendly,but it also allows for cost savings. Furthermore, it may lower the amount of resources required topower a facility. Many industries have implemented one-of-a-kind waste warmth recovery solutions.A warmness exchanger is a common option. This work describes the investigation of silica and alumina nanofluids in shell and helical coil heat exchangers. In this present paper, attempts aremade to recall how the nanofluid will supply strain decrease in hot and cold fluid, as well as whatbecomes the alternate in Reynolds' number, by evaluating the results/ researched by various authors.