Background: Phase Change Materials (PCMs) are pivotal for latent heat thermal energy storage, but their widespread application is hindered by low thermal conductivity, which delays charging and discharging rates.

Objective: This study investigates the thermophysical enhancement of a paraffin-based PCM by dispersing a hybrid mixture of Graphene Nanoplatelets (GNP) and Copper Oxide (CuO) nanoparticles.

Method: This study uses a simulated dataset created for academic training purposes. Simulated data representing thermal conductivity, latent heat, and viscosity were generated based on established theoretical mixing models (Maxwell and Einstein models) for varying weight fractions (0.1% to 1.0%) of hybrid nanoparticles.

Key Results: The addition of 1.0 wt% hybrid nanofluid increased the thermal conductivity of pure paraffin by 62%. However, latent heat capacity decreased by 8%, and viscosity increased exponentially, particularly above 0.7 wt%.