Hadi Fauzi, Hendrik S.C. Metselaar, T.M.I. Mahlia, Mahyar Silakhori, Hadi Nur
In this study the addition of surfactant to fatty acids as phase change materials (PCMs) for solar thermal applications is proposed. The incorporation of surfactant additives into a eutectic mixture of fatty acids can significantly increase the value of latent heat storage and can suppress undercooling. We report the preparation of myristic acid/palmitic acid (MA/PA) eutectic mixture as Phase Change Material (PCM) with addition of 0, 5, 10, 15, and 20% sodium myristate (SM), sodium palmitate (SP), and sodium stearate (SS), the influence of surfactant additives on thermal properties and thermal conductivity of eutectic mixtures. It was found that the addition of 5% SM, 5% SP, and 5% SS to MA/PA eutectic mixture is very effective in depressing the liquid/solid phase change temperature, reducing the undercooling and increasing the amount of latent heat of fusion as well as thermal conductivity of eutectic PCM compared to eutectic PCM without surfactants. Furthermore MA/PA + 5%SS has the highest latent heat of fusion of 191.85 J g-1, while MA/PA + 5%SM showed the least undercooling of 0.34 C and the highest thermal conductivity of 0.242 W m-1 K-1. © 2013 Elsevier B.V. All rights reserved.
Department of Mechanical Engineering, University Malaya, Kuala Lumpur 50603, Malaysia; Department of Mechanical Engineering, Universiti Tenaga Nasional, Kajang 43000, Selangor, Malaysia; Department of Chemical Engineering, Syiah Kuala University, Banda Aceh 23111, Indonesia; Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
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