| 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Na2SO4?10H2O和Na2HPO4?12H2O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%Na2SO4?10H2O+48%Na2HPO4?12H2O+ 16%NH4Cl+1.6%硼砂+1.6%CMC+0.8%纳米TiO2，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0.798 9 W/(m?K)，经过50次循环后，具有良好的热稳定性。 |
| 关键词: 无机水合盐 空调蓄冷 相变材料 制备实验 |
| DOI： |
| Received:January 12, 2021Revised:March 22, 2021 |
| 基金项目:华设设计集团股份有限公司开放基金项目（8503008464）资助。 |
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| Preparation and Modification of Composite Inorganic Salt Phase Change Materials for Cold Storage |
|
Li Mengxin1, Chen Peng2, Lü Zhongling2, Chen Zhenqian1
|
| (1.School of Energy and Environment, Southeast University;2.China Design Group Co., Ltd., Tsinghua University) |
| Abstract: |
| 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 Na2SO4?10H2O and Na2HPO4?12H2O 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% Na2SO4?10H2O + 48% Na2HPO4?12H2O + 16% NH4Cl + 1.6% borax + 1.6%CMC + 0.8%nano-TiO2. 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 0.798 9 W/(m?K). After 50 cycles, the composite inorganic salt system exhibits good thermal stability. |
| Key words: inorganic hydrated salt air conditioning cold storage phase change materials preparation |
