Effect of surfactant on functionalized multi-walled carbon nano tubes enhanced salt hydrate phase change material

• Published in: Journal of energy storage Vol. 55; p. 105654
• Main Authors: Kumar R, Reji, Pandey, A.K., Samykano, M., Mishra, Yogeshwar Nath, Mohan, R.V., Sharma, Kamal, Tyagi, V.V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 25.11.2022
• Subjects: conductivity; Energiteknik; Energy & Fuels; Energy Engineering; Multi-walled carbon nanotubes; pcms; Phase change materials; system; Thermal; Thermal conductivity; Thermal energy storage; Phase change materials; Thermal conductivity; Thermal energy storage; Multi-walled carbon nanotubes
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2022.105654

Phase change materials (PCMs) are effective thermal energy storage materials; however, their low thermal conductivity nature tends to affect heat storage performance. Salt hydrate being inexpensive, incombustible and ensuring high phase change enthalpy, are highly attractive for energy storage. The potential of multi-walled carbon nanotubes (MWCNTs) in improving the thermophysical properties of salt hydrate PCMs makes it a hotspot of current research. Therefore, in this research article, MWCNTs and functionalized multi-walled carbon nanotubes (FMWCNTs) nanoparticles were dispersed with inorganic salt hydrate at different concentrations (0.3, 0.5, and 1.0 wt%), in the presence and absence of surfactant. The role of surfactant with salt hydrate PCM has been discussed extensively. The results obtained have ensured an enhancement in melting enthalpy of prepared composites by 4.92 %, and 28.5 % for 0.5 wt% MWCNT dispersed PCM (SHM0.5), and 0.5 wt% FMWCNT dispersed PCM (SHF0.5), respectively. Furthermore, the maximum thermal conductivity was enhanced by 50.0 % and 84.78 % for 0.5 wt% MWCNT dispersed PCM with surfactant (SHMS0.5), and SHF0.5 respectively, compared to salt hydrate PCM. From the improvement in thermal conductivity, light absorptance, thermal stability, latent heat, and chemical stability, it is evident that the prepared nanocomposite is a potential candidate for solar thermal energy storage applications. [Display omitted] •The effect of surfactant on MWCNT and FMWCNT dispersed PCM is analyzed.•The thermal stability of prepared composites significantly improved in all cases.•The maximum thermal conductivity enhancement was 84.78 % for the SHF0.5 composite.•A substantial reduction in light transmittance by 92.41 % for SHF1.0 composite•Nanocomposites are thermally and chemically stable up to 500 thermal cycles.