摘要
沸石(CA)具有较大的比表面积、孔隙度和吸附性能,利用沸石作为吸附石蜡(PA)载体,可以有效的降低石蜡的泄露问题。研究采用石蜡为相变材料、沸石为吸附载体、膨胀石墨(EG)为增强导热材料,采用真空吸附法制备复合相变材料,通过单因素实验确定试验的影响因素与水平,即吸附温度、真空度、石蜡质量分数。利用响应面法得到各个影响因素的大小,从大到小依次为真空度、石蜡质量分数、吸附温度,并对试验进行优化。通过DSC、FTIR测试了复合材料的结构以及热性能。DSC结果显示复合材料的相变温度和相变潜热为32.04℃和63.87 J/g可调节室内温度,作为建筑储能材料使用。FTIR测试结果表明各材料之间并未发生化学反应,经200次冷热循环后复合材料仍具有良好的热稳定性和化学稳定性。
Zeolite(CA)is renowned for its large specific surface area,porosity,and superior adsorption capabilities.Utilized as an adsorbent carrier for paraffin(PA),it significantly mitigates paraffin leakage.In this study,paraffin was employed as the phase change material,zeolite as the adsorption carrier,and expanded graphite(EG)was used to enhance thermal conductivity.The composite phase change material was synthesized via a vacuum adsorption process.Single-factor experiments were conducted to ascertain the key influencing factors and their levels,which included adsorption temperature,vacuum level,and the mass fraction of paraffin.The response surface methodology(RSM)was applied to quantify the effects of these factors,ranking them in order of significance:vacuum level,paraffin mass fraction,and adsorption temperature.The experimental conditions were optimized based on these insights.The structural and thermal properties of the composite material were assessed using differential scanning calorimetry(DSC)and Fourier-transform infrared spectroscopy(FTIR).DSC analysis indicated a phase change temperature of 32.04℃and a latent heat of 63.87 J/g for the composite material,rendering it suitable for indoor temperature regulation and as a building energy storage material.FTIR analysis confirmed the absence of chemical reactions among the constituent materials.Additionally,the composite material demonstrated good thermal and chemical stability after 200 cycles of heating and cooling.
作者
薛智奇
王汉青
赵金萍
吴松林
XUE Zhiqi;WANG Hanqing;ZHAO Jinping;WU Songlin(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Engineering Research Center of Full Life-cycle Energy-efficient Buildings and Environmental Health,Changsha 410004,China)
出处
《功能材料》
北大核心
2025年第8期8013-8020,共8页
Journal of Functional Materials
基金
国家自然科学基金项目(52276094)
湖南省教育厅重点项目(24A0188)。
关键词
沸石
石蜡
膨胀石墨
真空吸附
响应面
热性能
zeolite
paraffin
expanded graphite
vacuum adsorption
response surface
thermal performance
作者简介
薛智奇(2001—),男,在读硕士,师承王汉青教授,从事相变储能材料研究。;通讯作者:王汉青,E-mail:hqwang@csuft.edu.cn。
