Akademik Veri Yönetim Sistemi
European Physical Journal Plus, cilt.140, sa.7, 2025 (SCI-Expanded)
This study focuses on the use of biochars produced under different conditions as support materials to enable the shape-stable application of phase change materials (PCMs) in building components. For this purpose, the effects of incorporating PCM/biochar composites into building wall components on performance improvements were comprehensively investigated. In this context, the performance of biochars was systematically examined in terms of their energy storage capacity, considering both raw material variations and different pyrolysis conditions. For this purpose, bio-based waste materials such as hazelnut outer shells, peanut outer shells, pine sawdust, and poplar sawdust were converted into biochar under identical pyrolysis conditions. The potential of the obtained biochars to be used as support materials for PCM, which exhibit solid-to-liquid phase transitions, was comparatively analyzed based on the latent heat storage performance of the PCM/Biochar composites. According to the evaluations, the PCM/poplar sawdust biochar composite was identified as the most suitable material, with a latent heat storage capacity of 75.12 J/g. In the subsequent phase of the study, the effects of different pyrolysis conditions on the latent heat storage capacity of the PCM/poplar sawdust biochar composite were investigated. In this scope, it was determined that decreasing the maximum pyrolysis temperature resulted in a 35.6% improvement in latent heat storage capacity, increasing the heating rate led to an 18.5% improvement, and extending the pyrolysis residence time provided a 2.47% improvement. By incorporating the PCM/poplar sawdust biochar composites produced under optimal pyrolysis conditions into cement mortar, a building component was developed that possesses both energy storage capacity and reduced thermal conductivity. Following equal-duration heating and cooling processes, it was found that the developed component reduced temperature fluctuations by 5.9 °C on the inner wall surface and by 3 °C in the room temperature.