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reduction of natural convection, which is a main heat transfer mechanism (Fan et al., 2014). Lokesh et. al (2015) reported that the high loading (0.9 wt.%) of MWCNTs in wax resulted in a significant reduction in solidification time, but longer melting times due to increased viscosity. Therefore, the optimum loading of nanoparticles maximizing the heat conduction enhancement while not compromising the natural convection effect plays a crucial role in NEPCM studies. Other crucial parameters that caused controversy among researchers are the changes in latent heat capacity and phase change temperature when nanoparticles are added to PCMs. Shaikh et al. (2008) indicated that doping SWCNTs into shell wax at 1 vol.% increased the latent heat capacity up to 13%. Wang et al. (2009) showed a decreased melting temperature and improved latent heat capacity with increasing loadings of MWCNTs in wax. Tang et al. (2014) found that the latent heat of fusion seemed to be increased by more than 10% for 1 and 5 wt.% added f-MWCNTs, whereas 10 wt.% added f-MWCNTs decreased the latent heat capacity, indicating too much f-MWCNTs deteriorates the crystallization growth. Some researchers, on the other hand, reported no change in latent heat capacity with the presence of CNTs (Cui et al., 2011) and xGNP (Kim and Drzal, 2009). However, the majority of studies showed that the addition of nanoparticles gives rise to a significant reduction in latent heat capacity with increasing nanoparticle content (Ho & Gao, 2009; Jesumathy et al., 2012; Teng & Yu, 2012; Fan et al., 2013; Warzoha & Fleischer, 2014; Wu et al., 2016; Nourani et al., 2016(January)). Therefore, this setback affects the storage capacity of thermal storage units that use NEPCMs. Yet, there is another beneficial feature of nanoparticles apart from enhancing thermal conductivity. Supercooling is known to be 15PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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