A study was conducted on a combined sensible and latent heat storage element using cementitious materials integrated with Phase Change Materials (PCMs). The findings from this study serve as a preliminary basis for conducting experimental tests on an almost-ready rig within the laboratory of the department. Employing the computational fluid dynamics software ANSYS Fluent, a numerical analysis was carried out on the thermal storage elements to simulate the behavior and processes associated with concrete heat exchangers, particularly pile heat exchangers that incorporate PCM. The numerical model examined various temperature profiles and the amount of energy stored within a concrete cylinder containing PCM, which is heated by water at different temperatures flowing through either a smooth or finned metal tube aligned with the axis of the cylinder. This entire system is positioned within a sand volume, simulating the conditions typically found in the soil for geothermal exchange systems. The results of the numerical simulation were consistent with initial expectations and hypotheses: configurations incorporating PCM, with inlet water temperatures of 80 ℃ and 90 ℃, exhibited approximately a 20% increase in stored thermal energy with a 10% PCM addition to the concrete mixture, while a 40% increase was observed with a 20% PCM addition. These findings are encouraging and support further investigation through an experimental campaign with the laboratory rig.