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THE CAPRIC-LAURIC ACID AND PENTADECANE COMBINATION AS PHASE CHANGE MATERIAL FOR LOW-TEMPERATURE THERMAL ENERGY STORAGE

The results obtained from the assessment of the mixture of capric acid and lauric acid (C-L acid), in the respective composition ratio of 65 and 35 by mole percent, proved acceptable as good phase change material (PCM) for thermal energy storage (TES). However, the C-L acid temperature incursion (18-20 o C) was quite high for low-temperature TES. Previous work has indicated that multiple PCM provides a thermodynamic advantage for latent TES. With the thermal property qualifications offered by pentadecane (163 kJ/kg, latent heat and 9.9 o C, melting temperature), the thermal characteristic of the combination of pentadecane with the C-L acid in different volume ratios was investigated to determine an improvement in the C-L acid latent heat store. DSC results showed that the combination in equal volume ratio provided the best melting characteristic (164 kJ/kg, latent heat and 8.2 o C, melting temperature), presenting an improvement in the C-L acid for low-temperature TES application.