Reviewing numerical studies on latent thermal energy storage in cementitious composites: report of the RILEM TC 299-TES

This paper explores the computational modeling of transient heat conduction in thermal energy storage (TES) systems for buildings made of cementitious composites with microencapsulated phase change materials (PCMs). Addressing solid ↔ liquid phase transitions, the study examines numerical approaches and homogenization techniques to define effective thermal properties. Discussion spans both numerical and analytical homogenization models, followed by a comprehensive exploration of approaches to incorporate phase change effects into the numerical solution of transient heat conduction problems. Challenges such as enthalpy-temperature hysteresis and supercooling phenomena are addressed, proposing alternative formulations for stable solutions and improved convergence. The paper highlights the complexities of phase change phenomena and emphasizes the need for ongoing research to enhance modeling techniques for practical applications.