Comparative Thermal Performance Analysis of Helical Coil Heat Exchanger with Nanofluid Using ANSYS

Mechanical Engineering

In cooling system of heat exchanger, the water is evaporated at high temperature, so it will need to add water and also water is low capacity of absorb heat. By using nanofluids in heat exchanger instead of water, it can improve the thermal efficiency of heat exchanger. So, the effect of the heat exchanger is improved and the overall efficiency of heat exchanger will have increased. A Nanofluid is a fluid containing nanometer-sized particles, called nanoparticles. Nanofluid is mixed with the fluid like water. Conventional heat transfer fluids such as Water, mineral oil, and ethylene glycol play an important role in many industries including power generation chemical production, air conditioning, transportation, and microelectronics etc. In particular, tube containing nanofluids provide several advantages over conventional fluids, including thermal conductivities far above those of traditional solid/liquid suspensions, a nonlinear relationship between thermal conductivity and concentration, strongly temperature-dependent thermal conductivity, and a significant increase in critical heat characteristics. In present work, Computational Fluid Dynamics Analysis is performed for different mass flow rates at coil side and constant rate of shell side under steady state conditions. Also, the volume fraction of Nano particles can be varying. Further a computational work has been accomplished to determine the effect of heat transfer in the helical coil heat exchanger by considering the parameters like pitch, coil diameter, total height of coil etc. In this work, evaluated the results from ANSYS CFD software with different coil flow and compared to each for finding better one. It was found that the characteristics of heat transfer were found better at the Al2O3+H2O with 5% and it is well desired to be maintained in the coil.

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