To improve the thermophysical properties of lauric acid (LA), several loadings of copper oxide(CuO) and aluminum oxide (Al 2 O 3 ) nanoparticles (1.25, 2.5, 5, and 10 wt%) were used. In this present study, the possibility of varied concentration nanoparticles to create LA embedded nanocomposite phase change material (NPCM) with increased performance is also studied and compared. The analytical expressions for estimating both thermal conductivity (TC) and dynamic viscosity of the NPCM were devised, and the findings were confirmed against the experiment. Employing a computational fluid dynamics (CFD) model, the effects of nanoparticle concentration on LA's rate of melting and solidification are examined. The morphological structures of nanoparticles were seen using a field emission scanning electron microscope (FESEM), and their crystalline structure was determined using X-ray diffraction (XRD) analysis. Fourier transform infrared spectroscopy (FTIR) was used to verify NPCMs.The impact of nanoparticles on NPCM was demonstrated by the thermal conductivity (KD2 test) findings. The current results suggest that distributing nanoparticles in lower concentrations speeds up the HTR. Compared to copper oxide (CuO) nanoparticles, the enhancement in the thermal performance of LA is more significant for aluminum oxide (Al 2 O 3 ).aluminum oxide, copper oxide, Lauric acid, nanocomposite phase change material, nanoparticles, PCM, phase change materials, thermal energy storage | INTRODUCTIONResearchers put up more effort to create different solar energy storage technologies. Latent thermal energy storage (LTES) has received increased attention from researchers due to its more considerable energy storage capability than that of sensible thermal energy storage (STES). In comparison to STES, LTES with phase change materials (PCM) offers a high energy storage density. System performance is improved by PCM's ability to shift