Currently, energy storage systems are considered a key solution when mismatch occurs
between energy supply and demand, allowing a more ecient energy deployment and use.
The present paper is focused on the study of a latent heat thermal energy storage (LHTES) system
based on a packed bed of encapsulated phase change material (PCM) of spherical shape, conceived
as an auxiliary component of a micro-grid to be built in a Research Center located in southwestern
Sardinia (Italy). The main purpose of this work was to perform numerical simulations for predicting
the performance of the TES system, designed to store the surplus thermal energy produced during the
weekend by a heat pump fed by a photovoltaic (PV) plant. The stored energy would then be utilized
during the weekdays to integrate the air-conditioning system supply. The numerical simulations were
based on a one-dimensional (1-D) two-equation transient model, able to return the thermocline profile
of the water and the PCM separately. The behavior of the LHTES device during charge and discharge
phases was reproduced, as well as during the standby periods. Finally, two characteristic indexes of
the PV system were evaluated, to investigate the eect of TES on grid interchanges, self-consumption,
and self-suciency
