摘要
糖醇类相变材料(PCMs)在中温范围内因其综合性能优异而备受关注。目前,以单一目标进行优化的糖醇类复合PCMs,其综合性能的评价尚不完善。本文以赤藓糖醇(Ery)作为PCMs,联合膨胀石墨(EG)和纳米Al_(2)O_(3)作为添加剂,采用熔融共混法制备了三元复合PCMs,并对其综合性能进行了评价。结果表明:三元复合PCMs各组元之间具有很好的物理相容性。其中,三元复合PCMs 0.5%Al_(2)O_(3)/1.5%EG/Ery的综合性能最优。该三元复合PCMs在保持高熔化焓(312.9 kJ/kg)的基础上,相较于Ery,导热系数达到了1.083 W/(m·K),提升了54%。在等温冷却测试中,其过冷度减小了9.3℃;在非等温冷却测试中,过冷度减小了16.7℃。热解温度提高了20℃,最高热解速率温度提高了8.3℃,因此热稳定性显著提升。此外,经过40次等温循环测试后,其过冷度和熔化焓基本保持不变,表现出良好的循环稳定性。
Sugar alcohols are gaining attention as highly promising medium-temperature phase change materials(PCMs)due to their superior overall performance.Currently,the evaluation of the comprehensive performance of sugar alcohol composite PCMs optimized for a single objective remains incomplete.In this study,erythritol(Ery)was used as a PCM,combined with expanded graphite(EG)and Al2O as additives.A ternary composite PCM was prepared using the melt blending method,and its comprehensive performance was assessed.The results showed that the components of the ternary composite PCM exhibited excellent physical compatibility.Among them,the ternary composite PCM with 0.5%(wt)Al_(2)O_(3)/1.5%(wt)EG/Ery demonstrated the best overall performance.This ternary composite PCM maintained a high melting enthalpy of 312.9 kJ/kg and,compared to Ery,achieved a thermal conductivity of 1.083 W/(mK),an increase of 54%.In the isothermal cooling test,its supercooling degree was reduced by 9.3℃,in the non-isothermal cooling process,its supercooling degree was reduced by 16.7℃.The pyrolysis temperature increased by 20℃,and the maximum pyrolysis rate temperature increased by 8.3℃,significantly enhancing thermal stability.Additionally,after 40 isothermal cycling tests,its supercooling degree and melting enthalpy remained essentially unchanged,demonstrating excellent cycling stability.
作者
库尔班江·乌丝曼
史琳
戴晓业
WUSIMAN Kuerbanjiang;SHI Lin;DAI Xiaoye(Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;School of Electrical Engineering,Xinjiang University,Urumqi 830046,China)
出处
《工程热物理学报》
北大核心
2025年第6期1729-1737,共9页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.52176011,No.52236003)。
关键词
赤藓糖醇
熔化焓
导热系数
过冷度
稳定性
erythritol
melting enthalpy
thermal conductivity
supercooling degree
stability
