The triple concentric pipe heat exchanger (TCPHE) is the subject of the current study, which uses a numerical technique. Numerical validation is used to verify the TCPHE performance for different type of flow like counter and parallel flow. Using available commercial ANSYS software, the temperature alteration for the stream of different three distinct fluids CHN (cold, hot, normal) and NHC (normal, hot, cold) along the pipe span is simulated. By supplying water, the middle tube always receives hot fluid, while the other tubes alternately receive normal and cold fluid. The tube has a length of 4 m, and the outer diameters of the inner, intermediate, and outside pipes are, respectively, 0.05, 0.076, and 0.1015 m. Each tube’s thickness is 1.50 mm where overall coefficient of heat transfer is calculated theoretically in both cases (CHN and NHC) using Al2O3 and TiO2 nanofluids in weight fractions percentage of 0.01, 0.03, 0.05, and 0.07 in place of standard fluid as water. The results showed that nanofluids perform better thermally than water and that increase the degree of heat transfer by increasing wt. fraction in nanofluids. The outcomes of counter flow show superior in NHC flow arrangements.