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In this study, the first batch of samples was prepared with only the mechanical dispersion method. A desired amount of each nanoparticle corresponding to 0.5, 1 and 2% by mass and paraffin wax were first weighed on electronic scales (Denver Instrument-Model P-214, Ohaus Corporation-Adventurer Pro AV8101C, respectively). Then, paraffin wax was melted in a beaker on a hot plate stirrer (SP131320-33Q, Cimarec - Thermo Scientific). The temperature of the hot plate stirrer was kept above the melting temperature at 70°C. Magnetic stirring was applied for 1 h at an average speed of 600 rpm after adding the specified amount of nanoparticles. Stirring was followed by sonicating the samples for an hour at 30% amplitude (50 W, Sonifier Cell Disrupter, Branson). Figure 4.2 shows the sample preparation process. The second and third batches of samples were prepared with Sodium Oleate and Octadecylamine surfactants, respectively. The previous NEPCM preparation procedure was followed. The only difference was that surfactants were added during stirring. Sodium Oleate with a mass ratio of 1:10 to nanoparticle amount was selected while the Octadecylamine to nanoparticle mass ratio was chosen as 2.5:1 following Tang et al. (2014). 4.2 Thermal Conductivity Measurements Thermal conductivity measurements were taken using a KD2 PRO Thermal Conductivity Analyzer (Decagon Devices, USA). This probe has been widely used in previous studies (Ho & Gao, 2009; Jesumathy et al., 2011; Cui et al., 2011; Yu et al., 2012; Kumaresan et al., 2012; Mehrali et al., 2013; Fan et al., 2013; Lokesh et al., 2015). The measurement technique is based on the transient-line-heat-source theory. In this theory, a known amount 53PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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