复合无机盐相变蓄冷材料的制备与改性研究  

Preparation and Modification of Composite Inorganic Salt Phase Change Materials for Cold Storage

作　　者：李梦欣 陈鹏 吕钟灵 陈振乾[1] Li Mengxin;Chen Peng;LüZhongling;Chen Zhenqian(School of Energy and Environment,Southeast University,Nanjing,210096,China;China Design Group Co.,Ltd.,Nanjing,210014,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]华设设计集团股份有限公司,南京210014

出　　处：《制冷学报》2021年第4期106-115,共10页Journal of Refrigeration

基　　金：华设设计集团股份有限公司开放基金项目(8503008464)资助

摘　　要：针对建筑空调领域6~7℃的蓄冷温度要求,本文制备出一种以Na_(2)SO_(4)·10H_(2)O和Na_(2)HPO_(4)·12H_(2)O为蓄冷基底材料的复合无机盐相变材料。通过步冷曲线分析法、差示扫描量热法、瞬态平面热源法等实验方法研究不同种类、质量添加剂对复合无机盐体系的影响。实验结果表明:改性后的复合无机盐体系最终配比为32%Na_(2)SO_(4)·10H_(2)O+48%Na_(2)SO_(4)·12H_(2)O+16%NH 4Cl+1.6%硼砂+1.6%CMC+0.8%纳米TiO_(2),相变温度为6.1~6.3℃,相变潜热为130~139 J/g,过冷度低于0.5℃,无相分离现象,液相导热系数为0.7989 W/(m·K),经过50次循环后,具有良好的热稳定性。Aiming at the temperature requirement of 6-7℃in the field of building air conditioning cold storage,a composite inorganic salt phase change material was prepared with Na_(2)SO_(4)·10H_(2)O and Na_(2)SO_(4)·12H_(2)O as cold storage base materials.The effects of different types and quality additives on the composite inorganic salt system were studied by step cooling curve analysis,differential scanning calorimetry,and the transient plane heat source method.The experimental results show that the final ratio of the modified composite inorganic salt system is 32%Na_(2)SO_(4)·10H_(2)O+48%Na_(2)SO_(4)·12H_(2)O+16%NH 4Cl+1.6%borax+1.6%CMC+0.8%nano-TiO_(2).The phase transformation temperature is 6.1~6.3℃.The latent heat of the phase transformation was 130-139 J/g.The undercooling is less than 0.5℃,and no phase separation phenomenon exists.The liquid-phase thermal conductivity is 0.7989 W/(m·K).After 50 cycles,the composite inorganic salt system exhibits good thermal stability.

关 键 词：无机水合盐 空调蓄冷 相变材料 制备实验 

分 类 号：TB61[一般工业技术—制冷工程] TB63.2