Design, Development and Heat Transfer Analysis on Heat Exchanger using Nano Fluids

Heat exchanger is used to exchange heat from one fluid to another with/ without mixing of two fluids. Modern heat exchangers use new techniques for efficient heat transfer. Nanofluids like CuO, Al2O3are highly preferred due to the inherent advantages like enhanced heat transfer rates compared to conventional methods. Literature survey included topics like: recent heat exchanger development methods, processes, effectiveness enhancement, experimentation with conventional method and nanofluids applications, comparative CFD analysis with experimental investigation, methods of preparation of nanofluids and various properties useful for using nanofluids for the analysis. CFD analysis Literatures suggests better results by varying cold fluid mass flow rates while keeping hot fluid mass flow rate constant. Literatures on nanofluids suggest that due to increase in concentration of nanofluid, heat transfer rate increases. This paper highlights the analysis with ANSYS14.5 on Double Pipe Heat Exchanger. For comparative purpose the analysis was initially done using hot and cold water in counter-flow method and later using different nanofluids concentrations instead of cold water. Various concentrations for CuO & Al2O3 used were.0.1%, 0.15%, 0.2% & 0.25% by volume fraction at 1 to 10LPM mass flow rates. Experiments were done at 0.1% & 0.15% of Al2O3 by volume fraction at 4, 6, 8 & 10LPM mass flow rates. Tabulated results and graphs show heat transfer enhancement using nanofluids. Conclusion of experimental results indicates that heat transfer enhancement of 7.4% at volume fraction of 0.15% Al2O3 at mass flow rate of 10LPM of cold Fluid.