Numerical simulation and thermal performance of hybrid brick walls embedding a phase change material for passive building applications

摘要

Phase change materials (PCMs) have the ability to store/release huge latent heat during phase change. When used in the building envelope, the PCM wall panel can potentially enhance the building's operation by reducing energy requirements to maintain thermal comfort, downsizing heating/cooling equipment, and shifting the peak load from the electrical grid. This work deals with the numerical simulation of the thermal performance of brick walls with embedded PCMs using an enthalpy-porosity approach. An implicit finite volume method is used for the numerical solution of conservation equations for mass, momentum, and energy. The results gathered have been judged in good agreement with the experiments. It turns out that incorporating PCM into brick masonry can both reduce maximum temperatures up to 3 degrees C and mitigate daily fluctuations. A higher PCM amount incorporated in a masonry wall reduces the energy consumption required to ensure a suitable comfort temperature. The inward heat transfer decreases if the PCM amount required for efficient storage is 20-30%. Finally, the proposed predictions seem to be useful for developing better storage of the heat energy and latent heat used in buildings to improve their overall energy efficiency.