Journal
JOURNAL OF ENERGY STORAGE
Volume 52, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2022.105027
Keywords
Paraffin wax; Multi-walled carbon nanotube; Surfactants; Thermal properties; Thermal stability
Categories
Funding
- Universiti Pertahanan Nasional Malaysia [UPNM/2019/GPJP/2/TK/3]
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This study investigates the effect of different weights of multi-walled carbon nanotubes and various surfactants on the thermal conductivity and thermal performance of paraffin wax. The results show that adding 0.06 wt% of multi-walled carbon nanotubes without surfactant can significantly enhance the thermal conductivity of paraffin wax.
An efficient phase change material (PCM) should not only exhibit high latent heat, but also high thermal conductivity. Combination of these favourable properties leads to an efficient latent heat thermal energy storage. Paraffin wax is one of the popular options for organic PCMs. However, paraffin wax has a low thermal conductivity, hindering its heat charging and discharging process. This study explores the effect of multi-walled carbon nanotube (MWCNT) weight percentage (0-0.08 wt%) and various surfactants (gum arabic (GA), polyvinylpyrrolidone (PVP), sodium docecylbenzene sulfonate (SDBS), and sodium dodecyl sulfate (SDS)) on the thermal conductivity, melting temperature, melting latent heat and thermal stability of paraffin wax. It is found that the maximum thermal conductivity enhancement (48%) is exhibited by paraffin wax/0.06 wt% MWCNT without surfactant compared to paraffin wax. The thermal conductivity of paraffin wax/0.08 wt% MWCNT added with PVP, SDBS and SDS are higher than samples added with GA. Overall, all samples exhibit single-step decomposition characteristics, as shown in thermogravimetric analysis (TGA).
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