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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1291-1297    DOI: 10.3785/j.issn.1008-973X.2019.07.007
机械与能源工程     
CaCl2·6H2O/EG复合相变材料的制备与性能研究
刘旋(),巫江虹*(),鲜婷,冯业
华南理工大学 机械与汽车工程学院，广东 广州 510641
Preparation and properties of CaCl2?6H2O/ expanded graphite composite phase change materials
Xuan LIU(),Jiang-hong WU*(),Ting XIAN,Ye FENG
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
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摘要：

为了改善六水氯化钙的蓄放热性能，以六水氯化钙为相变材料（PCM）、膨胀石墨（EG）为载体、六水氯化锶为成核剂，采用物理吸附法制备六水氯化钙/膨胀石墨复合相变材料，研究复合相变材料的热物理特性. 采用步冷曲线法，研究复合相变材料的过冷度、蓄/放热性能和热循环稳定性；采用扫描电镜、差示扫描量热法、热流计导热仪，对复合相变材料的显微形貌、相变潜热、相变温度、比热容和导热系数进行测定. 结果表明：在六水氯化钙中添加质量分数为10%的膨胀石墨和质量分数为2%的六水氯化锶，复合相变材料的相变潜热为151.6 J/g，导热系数提升至3.328 W/(m·K)，过冷度保持在2 °C以内. 相变材料的导热系数及过冷度得到显著改善.
关键词： 六水氯化钙;  膨胀石墨(EG);  相变材料(PCM);  过冷;  导热系数    
Abstract:

A composite phase change materials (PCM) was prepared by physical adsorption method with CaCl2·6H2O as PCM, expanded graphite (EG) as carrier and SrCl2·6H2O as nucleating agent in order to improve the heat storage-release property of CaCl2·6H2O. The thermophysical properties of the PCM were analyzed. The cooling curve was used to analyze the degree of supercooling, the heat storage-release property and thermal cycling stability of the composite PCM. The composite material’s micromorphology, latent heat, phase transition temperature, specific heat and thermal conductivity were measured by using scanning electron microscopy, differential scanning calorimeter and thermal conductivity meter. The experimental results showed that phase change latent heat of the composite PCM was 151.6 J/g by adding 10% mass fraction of EG and 2% mass fraction of SrCl2·6H2O into CaCl2·6H2O, thermal conductivity increased to 3.328 W/(m·K), and the degree of supercooling kept within 2 °C. The thermal conductivity and supercooling of the PCM were significantly improved.
Key words: CaCl2·6H2O    expanded graphite (EG)    phase change material (PCM)    supercooling    thermal conductivity
收稿日期: 2018-05-28 出版日期: 2019-06-25
CLC:  TK 02  
通讯作者: 巫江虹     E-mail: 986347431@qq.com;pmjhwu@scut.edu.cn
作者简介: 刘旋(1995?)，男，硕士生，从事太阳能热泵系统的研究. orcid.org/0000-0002-3247-9162. E-mail: 986347431@qq.com|巫江虹，女，教授，博导. orcid.org/0000-0001-5269-6175. E-mail: pmjhwu@scut.edu.cn
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刘旋
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引用本文:

刘旋,巫江虹,鲜婷,冯业. CaCl2·6H2O/EG复合相变材料的制备与性能研究[J]. 浙江大学学报(工学版), 2019, 53(7): 1291-1297.

Xuan LIU,Jiang-hong WU,Ting XIAN,Ye FENG. Preparation and properties of CaCl2?6H2O/ expanded graphite composite phase change materials. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1291-1297.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.07.007    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I7/1291

图 1  样品热物性表征测试装置示意图
图 2  膨胀石墨吸附能力照片
图 3  复合相变材料扫描电镜图
图 4  纯CaCl2·6H2O步冷曲线
图 5  EG-CaCl2·6H2O-SrCl2·6H2O体系的步冷曲线
图 6  CaCl2·6H2O和CaCl2·6H2O/EG的 DSC曲线
图 7  复合相变材料的比热容曲线
图 8  复合相变材料温度-导热系数曲线
图 9  复合相变材料热扩散系数-温度曲线
图 10  相变材料的蓄放热过程曲线
图 11  复合相变材料的热稳定测试曲线
n θn/°C θm/°C θc/°C
1 26.6 27.4 0.8
20 25.9 27.1 1.2
40 25.5 27.5 2.0
60 26.7 27.2 0.5
80 25.6 27.3 1.7
100 26.5 27.2 0.7
表 1  复合相变材料循环100次冷却相变特性
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