Researchers have developed a new composite phase change material (CPCM) called LA-PA/EG CPCM with promising properties for floor radiant heating systems. The SEM images of the LA-PA/EG CPCM show a network pore structure composed of graphite flakes and irregular pores that allow for easy adsorption of molten LA-PA. The material retains its original worm-like morphology, ensuring uniform adsorption in the honeycomb structure of the EG.
The DSC curves of the LA-PA/EG CPCM reveal a phase change temperature of \(35.5\;^{\circ }\)C and a latent heat of 169.8 J/g, suitable for floor radiant heating systems. The material also exhibits good thermal stability after 200 heat cycles, making it a reliable option for long-term use. Additionally, TGA curves show that the LA-PA/EG CPCM remains stable at 100\;^{\circ }C, further highlighting its applicability in building applications.
Furthermore, the thermal properties of concrete-based thermal energy storage composite materials (CTESCMs) incorporating the LA-PA/EG CPCM were also investigated. The DSC curves of the CTESCMs demonstrate varying phase change temperatures and latent heat values based on the CPCM mass content. Thermal conductivity tests reveal a decrease in thermal conductivity with increasing CPCM content, affecting the heat transfer ability of the material.
Moreover, the CTESCMs show promising heat storage/release effects, with longer durations at phase change temperatures as CPCM content increases. The long-term stability of the CTESCMs was assessed through accelerated thermal cycling tests, which indicated good stability even after 200 cycles.
Overall, the physical, mechanical, and microstructure properties of the CTESCMs were found to be influenced by the CPCM mass content, with changes in density, compressive strength, and microstructural characteristics observed. The SEM images revealed the presence of CPCM within the CTESCM, affecting the internal structure and porosity of the material. These findings provide valuable insights into the potential use of LA-PA/EG CPCM in energy-efficient building applications.
