The curved tubes are more advantageous than straight tubes because of its compact structure and have been practiced as an ace of passive heat transfer enhancement technique and are used in many heat transfer applications. Usually the coil will be wound inside the case of a helical coil heat exchanger but in our case the helix is wound outside the case. This offers the advantage of avoiding insulation outside the heat exchanger coils. This paper deals with experimental study and CFD simulation

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... helical coil heat exchanger using Solidworks Flow Simulation (Cosmos Express). The fluid used for coil side is CuO-water nano fluid and tube side is water. The flow rate of both fluids is maintained below as laminar and the flow rate of coolant is kept constant while that of hot fluid is changed. The readings during experimental study are taken once steady state has reached. The performance parameters pertaining to heat exchanger such as effectiveness, overall heat transfer coefficient, velocity contours, temperature contours etc. have been reported. Based on the results, it is inferred that the heat transfer rates and other thermal properties of the helical coil heat exchanger are comparatively higher than that of a straight tube heat exchanger and better than water as coolant.