Implementation Investigation of Solar Energy Storage System Enhancement by Spiral-Finned Tube Heat Exchanger is a research study authored by Kadhim H. Suffer, Hiba A. Hasan, Vinous Majeed Hameed, and Malek Khalaf Albezuirat. The study investigates the enhancement of latent thermal energy storage systems through the integration of paraffin wax as a phase change material (PCM) with an innovative spiral-finned shell-and-tube heat exchanger. Computational Fluid Dynamics (CFD) simulations, validated by experimental measurements, were conducted to compare three heat exchanger configurations: a conventional shell-and-tube heat exchanger (STHX), a pin-finned heat exchanger (SFTHX), and a novel spiral wire-wound pin-finned heat exchanger (SSWTHX). The results demonstrated that the SSWTHX configuration achieved complete PCM solidification in 3193 seconds, significantly outperforming the SFTHX (4317 s) and STHX (5710 s) designs, corresponding to improvements of approximately 44% and 25%, respectively. The enhanced performance was attributed to the increased heat transfer surface area and the spiral wire geometry, which accelerated heat transfer and PCM solidification. The strong agreement between the CFD predictions and experimental results validated the numerical model and confirmed the effectiveness of the proposed design for improving solar thermal energy storage efficiency. Keywords: Solar energy, CFD modelling, Phase Change Material (PCM), Latent heat storage, Spiral-finned tube, Shell-and-tube heat exchanger, Thermal energy storage, Solidification time, Heat transfer.