Abstract
In view of the problems existing in the practical application of phase change building materials, the cheap paraffin resources are used as phase change materials (PCM) to combine with ordinary building materials, and the mode analysis of the multi-phase composite of paraffin is carried out. Through ternary eutectic system theory of paraffin PCM composite, the temperature changes during the cooling process of ternary composite paraffin PCM is analyzed by cold curve test and differential scanning calorimetry (DSC) thermal property test. The results show that when the temperature range is 20-35°C, the temperature drop rate of composite PCM is obviously slowed down. The phase change of PCM begins to occur in this temperature range, and it lasts for a long time. It is concluded that a certain amount of latent heat of phase change is released during the process of PCM. In conclusion, the thermal performance of ternary composite paraffin PCM is better than binary composite system with solid-liquid mixing. Applying it to building roofing materials can effectively improve the thermal storage capacity of building materials.
