应用于低温集热蓄热的二十二烷-十二醇复合相变材料的制备和性能  

Preparation and properties of binary composite phase-change materials based on solar low-temperature heat storage

作　　者：陈红兵[1] 李春阳 王聪聪 李璊 卢浩阳 刘宇航 张岩[1] CHEN Hongbing;LI Chunyang;WANG Congcong;LI Men;LU Haoyang;LIU Yuhang;ZHANG Yan(Beijing Municipal Key Laboratory of HVAC,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Thermal Power Group Co.,Ltd.Shijingshan Branch,Beijing 100043,China)

机构地区：[1]北京建筑大学供热、供燃气、通风及空调工程重点实验室,北京100044 [2]北京市热力集团有限责任公司石景山分公司,北京100043

出　　处：《储能科学与技术》2023年第12期3663-3669,共7页Energy Storage Science and Technology

基　　金：中共北京市委组织部北京市优秀人才培养项目(24269220005)。

摘　　要：为使相变材料更好覆盖太阳能PV/T系统中电池背板的工作温度范围,提高系统的储热能力。本工作首先采用熔融混合法制备了不同质量分数的二十二烷-十二醇(DE-CP)二元相变材料,并对其潜热进行测试分析。其中,二元相变材料的相变温度区间为20~50℃,基本覆盖PV/T系统中电池背板的工作温度;相比于其他二元相变材料,DE质量分数为60%的二元相变材料的潜热值最大,为243.8 kJ/kg;并且DE与CP质量配比为6∶4的二元相变材料的高温度相变峰面积大于低温度相变峰面积,两个相变峰的分布说明,DE质量分数为60%的二元相变材料更加适合在太阳能PV/T系统中应用。然后在二元相变材料中添加EG(膨胀石墨)作为支撑材料,通过吸附增强其导热能力,最终得到复合相变材料。并对其潜热、相容性、导热性进行测量和分析,结果表明DE-CP/EG复合相变材料的相变温度区间仍为20~50℃,三种原材料的相容性好,导热系数由原来二元相变材料的0.135 W/(m·K)提升至1.383 W/(m·K),解决了相变材料自身导热系数低的问题,为后续复合相变材料在太阳能PV/T系统中的应用提供借鉴参考。The working temperature range for the battery backplane and the heat storage capacity in solar PV/T systems using phase-change materials need to be improved.In this report,docosane-dodecanol(DE-CP) binary phase-change materials with different mass fractions were prepared using the melt-mixing method,and their latent heat was tested and analyzed.The phase-change temperature range for the binary phase-change material is 20–50 ℃,which essentially covers the working temperature for the battery backplane in the PV/T system.Compared with other binary phase-change materials,the latent heat of the binary phase-change material with 60% DE mass fraction is the largest at 243.8 kJ/kg.Moreover,the high-temperature phase-change peak area for the binary phase-change material with a mass ratio of DE to CP of 6∶ 4 is larger than the low-temperature phase-change peak area.The distribution of the two phase-change peaks indicates that the binary phase-change material with a DE mass fraction of 60% is more suitable for application in solar PV/T systems.EG(expanded graphite) was then added to the binary phase-change material as a supporting substance to adsorb the material to enhance its thermal conductivity;finally,the composite phase-change material was obtained.The latent heat,compatibility,and thermal conductivity of DE-CP/EG composite phase-change material were measured and analyzed.The results show that the phase-change temperature range for the DE-CP/EG composite phase-change material remains at 20–50 ℃.There is good compatibility among the three raw materials,and the thermal conductivity increases from 0.135 W/(m·K) for the original binary phase-change material to 1.383 W/(m·K),which solves the problem of the low thermal conductivity of the phase-change material and provides a reference for the application of the composite phasechange material in solar PV/T systems.

关 键 词：复合相变材料 二十二烷 十二醇 膨胀石墨 热性能 储热 

分 类 号：TK519[动力工程及工程热物理—热能工程] TB34[一般工业技术—材料科学与工程]