Preparation and characterization of stearic acid/olive pomace powder composite as form-stable phase change material

•Stearic acid/olive cake powder and stearic acid/olive cake powder/graphite as new kinds of PCM composites were prepared.•Microstructure and chemical structure of composites were determined.•Thermal properties and thermal stability of the composites were examined.•Graphite can increase thermal conductivity of the composite.

This paper mainly includes the preparation, characterization and thermal properties of Stearic Acid/Olive Pomace Powder (SA/OPP) and Stearic Acid/Olive Pomace Powder/Graphite (AS/OPP) as a new form-stable composite phase change material for thermal energy storage, which are prepared by impregnation method followed by uniaxial compression. The graphite is added to improve thermal conductivity of SA/OPP form-stable composite PCM. Environmental Scanning Electron Microscope (ESEM), Fourier Transform Infrared (FT-IR), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis and Hot Disk Analyzer measurements are using to characterized morphology, chemical structure, thermal performances, thermal stability and thermal conductivity of form-stable composite PCMs, respectively. The DSC analysis reveals that the melting and freezing temperatures and the latent heats of the SA/OPP form-stable composite PCM are measured as 55 °C and 51 °C, 111 J/g and 109 J/g, respectively. In addition, thermal conductivity of the form-stable composite PCM is increased by adding 7 wt % of graphite.