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Capric–myristic acid/expanded perlite composite as form-stable phase change material for latent heat thermal energy storage

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  • Karaipekli, Ali
  • Sarı, Ahmet

Abstract

The aim of this study is to prepare a novel form-stable phase change material (PCM) for latent heat thermal energy storage (LHTES) in buildings. A eutectic mixture of capric acid (CA) and myristic acid (MA) is incorporated with expanded perlite (EP). Thermal properties, thermal reliability, and thermal conductivity of the form-stable composite PCM are determined. The maximum CA–MA absorption of EP was found to be 55wt% without melted PCM seepage from the composite, and therefore this mixture was described as a form-stable composite. The form-stable composite PCM was characterized using the FT-IR spectroscopy method. The melting and freezing temperatures and latent heats of form-stable composite PCM were measured using DSC analysis. Thermal cycling test of the form-stable composite PCM indicated good thermal reliability in terms of changes in thermal properties after 5000 thermal cycling. The thermal conductivity of the form-stable CA–MA/EP composite PCM was increased about 58% by adding 10wt% expanded graphite (EG). The form-stable CA–MA/EP/EG composite PCM was considered as an effective LHTES material in the building energy conservation due to suitable phase change temperatures, high latent capacities, good thermal reliability, and good thermal conductivity.

Suggested Citation

  • Karaipekli, Ali & Sarı, Ahmet, 2008. "Capric–myristic acid/expanded perlite composite as form-stable phase change material for latent heat thermal energy storage," Renewable Energy, Elsevier, vol. 33(12), pages 2599-2605.
    • Handle: RePEc:eee:renene:v:33:y:2008:i:12:p:2599-2605
    DOI: 10.1016/j.renene.2008.02.024
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    References listed on IDEAS

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    1. Tyagi, Vineet Veer & Buddhi, D., 2007. "PCM thermal storage in buildings: A state of art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(6), pages 1146-1166, August.
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    4. 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.
    5. 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.
    6. 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.
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