The high thermal efficiency of supercritical water makes it a promising alternative to water cooled reactors. This study impelments numerical analysis to examine the flow characteristics and heat transfer performance of supercritical water (SCW) in different tube configurations and fluid flow conditions, for Reynolds numbers from 8000 to 20000. This research examines how different geometrical parameters, such as the helical direction, number of lobes, and cross-sectional shape, impact the flow physics and heat transfer performance of different spiral tubes. The outcomes specify that increasing the lobed number in the tube improves the heat flux by about 5%-16%. Furthermore, introducing two direction changes in the twisted tube will cause a slight increase (about 20%) in the energy of the turbocharger. Finally, the sensitivity analysis of heat flux and Nusselt number to each of the effective parameters in the heat transfer of supercritical water in twisted tubes has been accomplished and the Response Surface Method (RSM) utilizes the central composite design (face-centered) approach. According to these two studies, it has been determined that the Reynolds number of the flow is most sensitive to the amount of heat transfer parameters; it has 26% and 76% effectivity on nusselt number and heat flux, respectively.

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