摘要
相变微胶囊材料因其环保性与经济性的优势,已成为相变储能领域的研究热点,但其导热性能过低,严重限制了相变微胶囊材料的推广与应用。本文分别用无水乙醇和蒸馏水填充于微胶囊的颗粒间隙中,获得复合相变体系,研究了无水乙醇和蒸馏水体积分数分别为20.0%、40.0%、60.0%时复合体系相变特性。实验结果表明,相比于空白体系,两液体填充复合体系的相变速率均有明显提高,无水乙醇/微胶囊复合体系相变速率提升了87.5%~266.7%,微胶囊/蒸馏水复合体系提升了125.0%~368.8%。蒸馏水对微胶囊材料的强化效果优于无水乙醇,同时两复合体系的相变速率均随着填充液体体积分数的增加而上升。研究结果对微胶囊相变强化技术的发展提供了理论指导。
Microcapsule phase change materials have become an important research hotspot in the field of phase change energy storage due to their environmental protection and economic advantages,but their thermal conductivity is too low,which seriously limits the promotion and application of phase change microcapsule materials.In this paper,the gap of microcapsules was filled with absolute ethanol and distilled water respectively to obtain a composite phase change system.The phase transition characteristics of microcapsules were studied when the volume fraction of absolute ethanol and distilled water were 20.0%,40.0%and 60.0%,respectively.The experimental results show that the phase transition rate of the two liquid-filled composite systems is significantly improved compared with the blank system.The phase transition rate of the anhydrous ethanol/microcapsule composite system is increased by 87.5%-266.7%,and the distilled water/microcapsule composite system is increased by 125.0%-368.8%.The strengthening effect of distilled water on microcapsule materials is better than that of absolute ethanol,and the phase transition rate of both composite systems increases with the increase of volume fraction of filled liquid.
作者
李子栋
杨亮
刘道平
薛久明
LI Zidong;YANG Liang;LIU Daoping;XUE Jiuming(School of Energy and Power Engineering, University of Shanghai for Science and Technology,Shanghai 200093, China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第3期3013-3018,共6页
Journal of Functional Materials
基金
国家自然科学基金青年资助项目(51606125)
国家煤加工与清洁化工程技术研究中心开放基金资助项目(2018NERCCPP-B05)
上海理工大学教师教学发展研究资助项目(CFTD192001)
关键词
液相
微胶囊
相变
强化
liquid phase
microcapsule
phase change
enhancement
