三水醋酸钠基复合相变材料导热能力强化研究.pdf

学免免第16卷第3期
建筑材料学报
Vol. 16, No. 3
2013年6月
JOURNAL OF BUILDING MATERIALS
Jun.,2013
文章编号:1007-9629(2013)03-0517-04
三水醋酸钠基复合相变材料导热能力强化研究
李伟华,茅新丰,李金田2,李永
(1.解放军理工大学工程兵工程学院,江苏南京210007;
2.海军工程大学勤务学院,天津300450)
摘要:在三水醋酸钠基复合相变材料中添加导热强化剂铜粉、碳粉和膨胀石墨,研究导热强化剂对复
合相变材料导热性能的影.利用示差扫描量热仪测量膨胀石墨添加前后复合相变材料的热特性.结
果表明:膨胀石墨能与三水酷酸納基复合相变材料很好共融,并对复合相变材料的导热有显著的强化
效果.膨胀石墨掺量为10%(体积分数)时,三水醋酸钠基复合相变材料相变焾为307.762kJI/kg,与未
添加膨胀石墨复合相变材料相变焓相比减少不到2%,而导热系数却提高了2倍
关键词:三水醋酸钠;导热;强化剂;复合相变材料
中图分类号:TU96
文献标志码:A
doi:10.3969/j.issn,1007-9629.2013.03.025
Study of Enhancing Heat Conductivity of Composite Phase Change
Material Based on Trihydrate Sodium Acetate
LI Wei-hua, Maojin-feng, LI Jintian, LI Yong
(1. Engineering Institute of Engineering Corps, PLA University of Science and Technology, Nanjing 210007, China
2. Logistics College, Naval University of Engineering, Tianjin 300450, China)
Abstract: The effect of heat conduction intensifiers, including copper powder, carbon powder and expand
ed graphite, on the heat conductivity of composite phase change material(PCM) based on trihydrate sodi-
um acetate were studied. The thermal characteristics of the PCM with or without expanded graphite added
were measured by the differential scanning calorimeter. Studies have shown that expanded graphite can
melt together with PCM well, and the intensified effect on the heat conductivity of PCM is obvious. When
the use level(by volume) of expanded graphite is 10%, the phase transition enthalpy of PCM is
307. 762 kj/kg, this is 2% less than that without expanded graphite added, but the thermal conductivit
increases 2 time.
Key words: trihydrate sodium acetate; heat conduction; intensifier; composite phase change material
(PCM)
在现代建筑中,相变材料越来越多地被利用,但0.24W/(m?K).张寅平等门在相变材料中加入铝
是大多数相变材料都存在导热系数差的缺点.为了粉和铜粉,使相变材料的导热系数分别提高了
改善这一缺点,通常采取添加导热系数较大的材料20%~56%和10%~26%
来提高相变材料的储、放热速率,改善相变材料的导
李金田等?曾研制出1种三水醋酸钠基复合相
热性能.例如 Xavier等?将相变材料石蜡与膨变材料.本文针对该复合相变材料,选用铜粉、碳粉
胀石墨复合,所得复合物的导热系数为4~和膨胀石墨作为导热强化剂开展研究,以探索适用
70W/(m?K),而石蜡本身的导热系数只有于该复合相变材料的高导热材料
收稿日期:2012-01-26;修订日期:2012-03-26
基金项目:国家人防科研基金资助项目(RF2070208)
第一作者:李伟华(1981-),男,河北赵县人,解放军理工大学博士生.E-mail.weihua8105@gmai.com