THERMAL ENERGY STORAGE USING PARAFFIN WAX

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THERMAL ENERGY STORAGE USING PARAFFIN WAX ( thermal-energy-storage-using-paraffin-wax )

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Angayarkanni & Philip, 2015), functionalization (Tang et al., 2014) and exfoliation processes for xGNPs (Kim and Drzal, 2009). The most important area of study regarding NEPCM characterization is thermal conductivity enhancement. MWCNTs, which are some of the most commonly used nanoparticles, have been shown to result in thermal conductivity enhancement, but sometimes with contradicting results. Warzoha and Fleischer (2014) claimed abnormal improvement reaching up to 2.5 W/m·K at high loadings (20 vol.%) of MWCNT in wax, while Angayarkanni and Philip (2015, June) showed that thermal conductivity was improved by 195% for a 0.05 wt.% MWCNT-wax composite. They pointed out that the reduced interfacial thermal resistance, internal stress and percolated network of nanoparticles at low loadings contributed to an improvement in thermal conductivity. Some researchers also pointed out a moderate improvement in thermal conductivity by at most 50% with the presence of MWCNTs at different loadings (Wang et al., 2009; Kumaresan et al., 2012; Cui et al., 2011). On the other hand, other researchers indicated only insignificant enhancement up to 20% (Yu et al., 2013; Fan et al., 2013). Wu et al. (2016) even stated no improvement with the dispersion of MWCNTs in paraffin wax at 0.5 - 3 wt. %. A highly entangled and prone to agglomeration structure was held accountable for the poor performance of MWCNTs. Dispersing another carbon-based nanoparticle, GNPs, have shown promising results in enhancing the thermal conductivity of paraffin wax. Kim and Drzal (2009) reported a remarkable increase from 0.229 W/m K to 0.8 W/m K for a 7 wt.% Paraffin/xGNP composite. Shi et al. (2013) showed that despite graphene’s high thermal conductivity, 13

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