3D Numerical Analysis of a Phase Change Material Solidification Process Applied to a Latent Thermal Energy Storage System

The techniques for releasing thermal energy accumulated in periods of high availability to meet the demand low supply contribute continuity cycles involved thermodynamic processes. In this context, phase change materials are capable absorbing and large amounts relatively short time under specific operating conditions. However, have conductivity need be coupled with high-thermal-conductivity so that heat flux can intensified absorption release times controlled. This work aims numerically study solidification process a material inserted into triplex tube exchanger finned copper walls intensify exchange between cooling transfer fluid, water, will receive material. proposes 3D numerical modeling meets models allow analysis full geometry latent storage system fluid dynamic phenomena influenced by geometry. Results temperature, liquid fractions velocity fields during transformations presented, analyzed validated experimental data, presenting average errors below 5%. total discharge was approximately 168 min, necessary complete material, water injected at flow rate 8.3 L/min temperature 68 °C. occurred more slowly same direction as length exchanger, from 80% solid state, difference z = 0 480 mm 30 min. conditions developed promoted maximum negative −6423 w/m2 annular internal surface −742 external surface, representing removal nine less intense on surface. released 239.56 kJ/kg.