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Crystals 2021, 11, 951 12 of 14 Authors (Year) Xu and Li (2014) [15] Li et al. (2014) [16] Tang et al. (2014) [17] Xiao et al. (2015) [18] Tao et al. (2015) [3] PCM paraffin (R27, Rubitherm) Paraffin Paraffin Palmitic acid Salt Table 5. Cont. Type of Additives MWCNTs Diatomite materials CNTs CNTs-SA (f-MWCNT) CNTs, oxidized CNTs and grafted CNTs SWCNT, MWCNT, graphene and C60 Fraction of Additives 0.26% - - 1, 5 and 10% 1/100 0.1%, 0.5%, 1.0%, 1.5%, 2.5% Comments The thermal conductivity of PCM-DP600-CNTs was substantially improved, with an improvement level of up to 42.45%. The thermal conductivity of MicroPCMs/CNTs-SA with 4% CNTs increased by 79.2% when compared to MicroPCMs. With 10 wt.% of f-MWCNTs, the thermal conductivity and the heat transfer of the paraffin/f-MWCNTs composite PCMs increased by 86.7%. CNTs, O-CNTs, and G-CNTs improved the palmitic acid thermal conductivity, but G-CNT composites had the highest latent heat. SWCNTs and MWCNTs exhibited significant enhancement in the PCMs’ thermal conductivity with mass fractions near 1.5% by 57% and 50%, respectively. The main suggestions for future work drawn in the light of the obtained results are as follows: 1. Studying the effect of PW/MWCNT composites (of various lengths and diameters) on the thermal conductivity and diffusivity of PW nanocomposites. 2. Comparing the effect of MWCNTs on heat storage/release rates to pristine PW. 3. Investigating the durability of these composites considering the number of possi- ble circular (heating/cooling) applications and any possible degradation of PCM over time. Author Contributions: Conceptualization, experimental work, and writing—original draft, N.H.A.; experimental work and analysis, M.R.A.; design, methodology, and interpretation of results, M.A.; editing, D.R.; editing and interpretation of results discussion, S.M.A.; conceptualization, design, interpretation of results, writing—original draft and editing, M.M.K.; reviewing. B.M.A. All authors have read and agreed to the published version of the manuscript. Funding: This research was funded by the King Abduaziz City for Science and Technology. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: The data used to support the findings of this study are included within the article. However, the corresponding author can provide the data used in this study upon request. Acknowledgments: The authors would like to thank the King Abdulaziz City for Science and Tech- nology and the Saudi Electricity Company for supporting this work. The authors would also like to thank SASO (Saudi Standards of Metrology and Quality) for providing access to their tools to conduct the DSC measurements. The authors are also grateful to Ali A. Algarni, Mohammed S. Alotaibi, Mohammed A. Alhajji, and Sultan A. Alburidi for the FT-IR, SEM, and TGA analysis.PDF Image | Paraffin Wax As a Phase Changing Material PCM
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