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Thermal conductivity improvement of stearic acid using expanded graphite and carbon fiber for energy storage applications

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  • Karaipekli, Ali
  • Sarı, Ahmet
  • Kaygusuz, Kamil

Abstract

The influence of expanded graphite (EG) and carbon fiber (CF) as heat diffusion promoters on thermal conductivity improvement of stearic acid (SA), as a phase change material (PCM), was evaluated. EG and CF in different mass fractions (2%, 4%, 7%, and 10%) were added to SA, and thermal conductivities of SA/EG and SA/CF composites were measured by using hot-wire method. An almost linear relationship between mass fractions of EG and CF additives, and thermal conductivity of SA was found. Thermal conductivity of SA (0.30W/mK) increased by 266.6% (206.6%) by adding 10% mass fraction EG (CF). The improvement in thermal conductivity of SA was also experimentally tested by comparing melting time of the pure SA with that of SA/EG and SA/CF composites. The results indicated that the melting times of composite PCMs were reduced significantly with respect to that of pure SA. Furthermore, the latent heat capacities of the SA/EG and SA/CF (90/10wt%) composite PCMs were determined by differential scanning calorimetry (DSC) technique and compared with that of pure SA. On the basis of all results, it was concluded that the use of EG and CF can be considered an effective method to improve thermal conductivity of SA without reducing much its latent heat storage capacity.

Suggested Citation

  • Karaipekli, Ali & Sarı, Ahmet & Kaygusuz, Kamil, 2007. "Thermal conductivity improvement of stearic acid using expanded graphite and carbon fiber for energy storage applications," Renewable Energy, Elsevier, vol. 32(13), pages 2201-2210.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:13:p:2201-2210
    DOI: 10.1016/j.renene.2006.11.011
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    References listed on IDEAS

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    1. Hasan, A. & Sayigh, A.A., 1994. "Some fatty acids as phase-change thermal energy storage materials," Renewable Energy, Elsevier, vol. 4(1), pages 69-76.
    2. Sarı, Ahmet & Kaygusuz, Kamil, 2001. "Thermal performance of myristic acid as a phase change material for energy storage application," Renewable Energy, Elsevier, vol. 24(2), pages 303-317.
    3. Sarı, A & Kaygusuz, K, 2003. "Some fatty acids used for latent heat storage: thermal stability and corrosion of metals with respect to thermal cycling," Renewable Energy, Elsevier, vol. 28(6), pages 939-948.
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