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One would expect lower latent heat (enthalpy change) when nanoparticles are added to a pure PCM since the particles will not contribute to latent heat. For the unusual increase of latent heat seen in the measurements, two causes are believed to be possible, one is related to the measurement uncertainty within the DSC instrument; the other more important one is related to the stability issue. The samples in DSC measurements were cut from different parts of a larger composite sample (in which nanoparticles could have deposited to one edge). The nanoparticle concentrations used in our analysis were therefore not reliable. 4.4 Stability of Paraffin Wax with Nanoparticles In the evaluation of the stability of NEPCMs, sedimentation observation was selected. There are plenty of reasons for choosing this method. Firstly, the relatively high melting temperature of the paraffin wax (53-57°C) restricts the usage of optical spectroscopy methods since there is no temperature control on the samples during measurements. Second, the observation of stability over consecutive thermal cycles is not practical with these methods due to solid-liquid phase change and the transparency issue. In addition, the zeta potential method is not suitable due to the non-polar characteristics of paraffin wax. It can be said that the optical spectroscopy methods provide a better option for nanofluid stability while visual stability evaluation is thought to be the most suitable method for NEPCMs. Effect of sonication on the stability of mechanically-prepared NEPCM One of the objectives of this study was to investigate the effects of sonication time on the stability of samples. To do that, melting-solidification thermal cycles for MWCNT-wax NEPCMs were performed in the environmental chamber (25 - 80°C). To avoid adverse 64PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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