Enhancement of heat transfer for thermal energy storage application using stearic acid nanocomposite with multi-walled carbon nanotubes

TingXian Li, Ju Hyuk Lee, RuZhu Wang, Yong Tae Kang

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

A latent heat storage nanocomposite made of stearic acid (SA) and multi-walled carbon nanotube (MWCNT) is prepared for thermal energy storage application. The thermal properties of the SA/MWCNT nanocomposite are characterized by SEM (scanning electron microscopy) and DSC (differential scanning calorimeter) analysis techniques, and the effects of different volume fractions of MWCNT on the heat transfer enhancement and thermal performance of stearic acid are investigated during the charging and discharging phases. The SEM analysis shows that the additive of MWCNT is uniformly distributed in the phase change material of stearic acid, and the DSC analysis reveals that the melting point of SA/MWCNT nanocomposite shifts to a lower temperature during the charging phase and the freezing point shifts to a higher temperature during the discharging phase when compared with the pure stearic acid. The experimental results show that the addition of MWCNT can improve the thermal conductivity of stearic acid effectively, but it also weakens the natural convection of stearic acid in liquid state. In comparison with the pure stearic acid, the charging rate can be decreased by about 50% while the discharging rate can be improved by about 91% respectively by using the SA/5.0% MWCNT nanocomposite. It appears that the MWCNT is a promising candidate for enhancing the heat transfer performance of latent heat thermal energy storage system.

Original languageEnglish
Pages (from-to)752-761
Number of pages10
JournalEnergy
Volume55
DOIs
Publication statusPublished - 2013 Jun 15
Externally publishedYes

Fingerprint

Stearic acid
Thermal energy
Energy storage
Carbon nanotubes
Nanocomposites
Heat transfer
Latent heat
Calorimeters
Scanning
Scanning electron microscopy
Heat storage
Phase change materials
Natural convection
Freezing
Melting point
Volume fraction
Thermal conductivity
Thermodynamic properties
Temperature

Keywords

  • Heat transfer
  • Multi-walled carbon nanotube
  • Nanocomposite
  • Stearic acid
  • Thermal energy storage

ASJC Scopus subject areas

  • Energy(all)
  • Pollution

Cite this

Enhancement of heat transfer for thermal energy storage application using stearic acid nanocomposite with multi-walled carbon nanotubes. / Li, TingXian; Lee, Ju Hyuk; Wang, RuZhu; Kang, Yong Tae.

In: Energy, Vol. 55, 15.06.2013, p. 752-761.

Research output: Contribution to journalArticle

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abstract = "A latent heat storage nanocomposite made of stearic acid (SA) and multi-walled carbon nanotube (MWCNT) is prepared for thermal energy storage application. The thermal properties of the SA/MWCNT nanocomposite are characterized by SEM (scanning electron microscopy) and DSC (differential scanning calorimeter) analysis techniques, and the effects of different volume fractions of MWCNT on the heat transfer enhancement and thermal performance of stearic acid are investigated during the charging and discharging phases. The SEM analysis shows that the additive of MWCNT is uniformly distributed in the phase change material of stearic acid, and the DSC analysis reveals that the melting point of SA/MWCNT nanocomposite shifts to a lower temperature during the charging phase and the freezing point shifts to a higher temperature during the discharging phase when compared with the pure stearic acid. The experimental results show that the addition of MWCNT can improve the thermal conductivity of stearic acid effectively, but it also weakens the natural convection of stearic acid in liquid state. In comparison with the pure stearic acid, the charging rate can be decreased by about 50{\%} while the discharging rate can be improved by about 91{\%} respectively by using the SA/5.0{\%} MWCNT nanocomposite. It appears that the MWCNT is a promising candidate for enhancing the heat transfer performance of latent heat thermal energy storage system.",
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