关键词: 石蜡, 膨胀石墨, 相变, 吸附, 载体

Abstract:

Taking 80^# paraffin as the phase change material and expanded graphite with network structure as the framework, we have prepared the 80^# paraffin/expanded graphite composite phase change material by using the multi-layer adsorption and pressing die method. The thermal stability and cycle stability of 80^# paraffin were analyzed by cyclic thawing experiment. The leakage rate of the composite phase change material with different components was determined through the titration filter paper leakage test. The latent heat, adsorption structure, thermal conductivity and leakage rate of the composite phase change materials were analyzed by using differential scanning calorimeter(DSC), scanning electron microscope(SEM), Hot Disk thermal constant analyzer and other instruments. The results show that when the amount of the added expanded graphite reaches 8% of the total component, the transformation temperature of the composite phase change material is 80.86℃ (endothermic) and 76.08℃ (exothermic), the latent heat is 130.12kJ/kg, and the leakage rate is less than 0.3%. The composite phase change material has the features of stable shape, low leakage rate, high heat storage density, and long life.

Key words: paraffin, expanded graphite, phase change, adsorption, support