Thermal energy storage systems (TESS) play a crucial role in addressing climate and energy challenges, particularly by improving energy efficiency and enabling the integration of renewable energy in the building sector. This study aims to develop and validate a numerical model of a packed bed latent thermal energy storage (PB-LTES) system that incorporates encapsulated phase change materials (PCM). The proposed model offers a robust and computationally efficient framework for evaluating the energy performance of LTES systems integrated into various renewable energy-based plant configurations. Developed in MATLAB, the PB-LTES model employs a one-dimensional total enthalpy approach, striking a balance between computational cost and simulation accuracy to deliver reliable results with minimal errors and reduced calculation time. The numerical model is validated using experimental data to ensure consistency with the actual thermal behavior of the LTES system. Key validation metrics include the temperature profiles of the PCM and the heat transfer fluid, which are essential indicators of system performance. In addition, the model's performance is evaluated for a hot water application during both charging and discharging phases to demonstrate its practical applicability. This research advances the development of TESS by delivering a validated, dynamic simulation tool that supports the deployment of sustainable energy solutions in real-world applications.