Thermal energy storage properties and lab-scale thermal performance in cementitious plaster of composite phase change material for energy efficiency of buildings

This study was aimed to achieve a form-stable composite PCM (FS-CPCM) by incorporating the eutectic mixture of octadecane (OD) and eicosane (EC) with pumice and also investigate thermo-regulation performance of its cementitious plaster form in lab-scale cubic unit. The scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) analysis results proved the existence of good physicochemical compatibility among the components of FS-CPCM. The differential scanning calorimetry (DSC) analysis results revealed that the FS-CPCM had phase change temperature of about 22°C and latent heat of capacity of about 77–78 J/g, respectively. Thermogravimetric analysis (TGA) and thermal cycling findings demonstrated that it had excellent thermal durability and cycling reliability. Lab-scale thermal performance of a cubic design plastered with FS-PCM/cement mortar was also evaluated experimentally. The results showed that the plaster including FS-CPCM had function of maintaining the interior temperature at comfortable range for a considerable long time.