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Abstract: The recovery of waste heat has been a topic of concern for large-scale industrial companies for several decades. This recovery not only makes an operation more environment friendly, but it also helps to cut costs. In addition to this, it can reduce the amount of resources needed to power a facility. Many industries have implemented different methods of waste heat recovery. In this present paper the efforts are made to understand that how to compare the heat transfer rate in Shell and Helical coiled tube heat exchanger using Carbon tubes Nano fluid with Water as a base fluid in Shell and Helical Heat Exchanger with the help of CFD on copper tube. Shell and Helical coil was fabricated by bending 500 mm length of copper tube having 10mm tube diameter, 50 mm pitch coil diameter, 25mm pitch and tapered angle 20. The comparison of pressure drop and temperature variation between different mass flow rate with water as its base fluid in copper tube found in this analysis. The result indicates that the Carbon Nanotube nanofluid with water as a base fluid at 0.2m/s mass flow rate have maximum pressure drop and also have minimum temperature variation compare with other mass flow rate.