Thermal Characteristics of Organic and Inorganic Eutectic Phase Change Materials Using T‐History and DSC Method During Solidification Phase

ABSTRACT The temperature‐history (temp‐hist) method offers a straightforward and effective technique for ascertaining the thermal‐physical properties of phase change materials (PCMs). This study explores three combinations of eutectic phase change materials (EPCMs): organic–organic, organic–inorganic, and inorganic–inorganic, aiming to identify the most suitable EPCM based on their heat conduction coefficient, heat capacity, and enthalpy of fusion for the solidification process. The experimental findings revealed that inorganic–inorganic EPCM demonstrated significantly superior thermal conductivity. Specifically, they exhibited approximately four times a 25% higher heat conduction coefficient in both solid and liquid phases compared to combinations involving organic–organic and organic–inorganic EPCM blends. Specific heat capacities and enthalpies of fusion were also analyzed, with organic–organic EPCM demonstrating superior values. The enthalpy of fusion for organic–organic EPCM surpassed that of inorganic–inorganic EPCM by 27.94% and outperformed organic–inorganic EPCM by 10.96%. Nusselt numbers and heat transfer coefficients were determined, highlighting the superior convective heat transfer efficiency of inorganic–inorganic EPCM. The lowest endothermic peak is 45°C for inorganic–inorganic EPCM from DSC analysis. The EPCMs' latent heat, specific heat, and phase transition temperatures nearly match the standard DSC method, proving the reliability of the lab‐made T‐history configuration. The results highlight how EPCM composition is crucial for achieving top‐notch thermal performance, emphasizing how blending organic and inorganic materials enhances heat transfer and phase change stability.