they present quite spherical agglomerates composed of many thousands of micro- capsules ranging between 5 μm and 10 μm (Fig. 1(a), and (b)). The spherical shape appears sometimes somewhat deformed and not very smooth. In addition, it was noticed that some macrocapsules were initially damaged and even broken before their use. The damage of PCMs can be initiated by the intensified shear forces during the mixing process. It can be observed from the SEM results (Fig. 1(c), and (d)) the emergence of many fragments derived from broken PCMs as well as smaller microcapsules of diameter ranging between 5 and 10 μm due to the deterioration of PCMs agglom- erations after their damage.