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Phase change materials (PCMs) are primarily used for storing solar thermal energy by absorbing and releasing heat during their phase transition process. This study investigates the development of binary phase change mixtures of fatty acids and paraffin wax, specifically lauric acid–paraffin wax (LA-PW) and myristic acid–paraffin wax (MA-PW) for building energy efficiency applications. The eutectic points and other properties of these binary mixtures were evaluated using thermodynamic laws and phase change equilibrium theory. The study focuses on comparing the accuracy of theoretically predicted mass compositions with experimentally obtained eutectic mixtures via the step-cooling curve method. The theoretical mass ratios for LA-MA, LA-PW, and MA-PW were found to be 0.65 LA and 0.35 MA, 0.54 LA and 0.46 PW, and 0.36 MA and 0.64 PW, with corresponding temperatures of 33.96 °C, 33.70 °C, and 39.30 °C, respectively. The results show that the eutectic point obtained experimentally for LA-MA was within range, with a composition of 0.70 LA and 0.30 MA. However, for LA-PW and MA-PW, significant deviation was found between the theoretically predicted and experimental values. Due to their low melting temperature range, binary mixtures of fatty acids, as well as fatty acid–paraffin wax mixtures, show potential for thermal energy storage applications.

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Development of Fatty Acids and Paraffin Wax Binary Mixture as a Phase Change Material for Building Energy-Saving Applications

  • 会议论文

  • 发表日期：

    2026年

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  • Prakash Singh,
  • Sumit Tiwari,
  • Ghanshyam Pal

摘要

Phase change materials (PCMs) are primarily used for storing solar thermal energy by absorbing and releasing heat during their phase transition process. This study investigates the development of binary phase change mixtures of fatty acids and paraffin wax, specifically lauric acid–paraffin wax (LA-PW) and myristic acid–paraffin wax (MA-PW) for building energy efficiency applications. The eutectic points and other properties of these binary mixtures were evaluated using thermodynamic laws and phase change equilibrium theory. The study focuses on comparing the accuracy of theoretically predicted mass compositions with experimentally obtained eutectic mixtures via the step-cooling curve method. The theoretical mass ratios for LA-MA, LA-PW, and MA-PW were found to be 0.65 LA and 0.35 MA, 0.54 LA and 0.46 PW, and 0.36 MA and 0.64 PW, with corresponding temperatures of 33.96 °C, 33.70 °C, and 39.30 °C, respectively. The results show that the eutectic point obtained experimentally for LA-MA was within range, with a composition of 0.70 LA and 0.30 MA. However, for LA-PW and MA-PW, significant deviation was found between the theoretically predicted and experimental values. Due to their low melting temperature range, binary mixtures of fatty acids, as well as fatty acid–paraffin wax mixtures, show potential for thermal energy storage applications.