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The presence of Al2O3 nanoparticles also slightly enhanced the thermal conductivity. This enhancement, however, was not proportional to the nanoparticle increase. Lower loadings of Al2O3 resulted in higher enhancement in the liquid phase, even with an outlier at 70°C for 0.5 wt.% Al2O3 due to natural convection possibly induced by Brownian motion (Figure 4.9). The precipitation issue again affected the measurements. It was seen that particles started to settle immediately once sonication was completed. Therefore, it was not possible to evaluate the potential of nanoparticles based on the obtained data. Solid phase measurements also revealed biased results, mainly fluctuating within the vicinity of pure paraffin wax’s thermal conductivity without any clear trend. It was also seen that there was just a small change in thermal conductivity with a mild decrease for the measurements that were done an hour after sample preparation (Figure 4.4). This is possibly due to already- deposited particles within the first hour. 4.3 Differential Scanning Calorimetry (DSC) Measurements DSC study was carried out to determine the melting/solidification temperatures and latent heat capacity of paraffin wax nanocomposites. The DSC equipment (Mettler-Toledo DSC1, Differential Scanning Calorimeter) is shown in Figure 4.10. Figure 4.11 shows the heating and cooling curves of the samples with a heating/cooling rate of 5°C/min. Two distinct peaks can be seen on both the heating and cooling curves, where the smaller peak corresponds to the solid-solid transition at around 35°C and the larger peak indicates the solid-liquid transition at around 50-55°C. 61PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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