Study on the Reliability and Stability of Fatty Acid‐Paraffin Ternary Phase Change Materials as Energy‐saving Materials

Abstract PCMs are an ideal energy storage material, widely used in construction and have gradually become a hot spot for research. To address the shortcomings and deficiencies of single PCM, this paper combined myristic acid (MA), palmitic acid (PA) and paraffin slice (48#, PS) to prepare a ternary system of PCM by using a melt blending method. The study found that the lowest eutectic point is reached when MA : PA : PS=43.4 : 18.6 : 38, with phase change temperature and enthalpy of phase change of 39.28 °C and 135.83 J/g, respectively, showing better superiority. Moreover, FT‐IR and XRD also indicated that no new functional groups appeared in this ternary PCM, no new substances were produced, and all were simple physical bonding. TG showed that MA‐PA‐PS does not decompose below 127.95 °C and has good thermal stability. Finally, it was indicated that its thermal reliability is good after 500 thermal cycles of MA‐PA‐PS. Therefore, as a new type of energy‐saving material, this ternary PCM has good reliability and superiority, and has good application prospects.