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In this research, an effort has been made to design and construct a heat exchanger that enables the transfer of heat across three different fluids. This heat exchanger is made up of three tubes: an aluminum tube (innermost tube), a copper tube (intermediate tube), and a GI tube (Outer most tube), which are arranged at the innermost, intermediate, and outermost positions, respectively. The study's aim is to find the optimal fluid flow arrangement of NHN, CHN, and NHC in the TTHXr that will provide the highest performance to heat exchangers. The heat exchanger's performance is assessed for three distinct mass flow conditions of fluid streams; (i) m ̇ Al = const, m ̇ Cu = m ̇ GI (variation) (ii) m ̇ GI = m ̇ Cu = const, m ̇ Al (variation) (iii) m ̇ Al ≠ m ̇ Cu ≠ m ̇ GI (variation). Experiments were carried out using counter-flow fluid stream configurations with turbulence flow conditions of hot fluid to evaluate the effectiveness of the heat exchanger for maximum heat extraction from hot fluid streams. Variations in the flow of the outermost fluid stream were discovered to have a substantial impact on heat exchanger performance. The results revealed that the NHC flow configuration of fluid streams had the best performance when compared to other fluid flow arrangements. [ABSTRACT FROM AUTHOR]