| 新型复合低温相变蓄冷材料的研制及热物性优化 |
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| 引用本文： | 贾蒲悦,武卫东,王益聪,张兵. 新型复合低温相变蓄冷材料的研制及热物性优化[J]. 化工学报, 2019, 70(7): 2758-2765. DOI: 10.11949/j.issn.0438-1157.20181505 |
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| 作者姓名： | 贾蒲悦 武卫东 王益聪 张兵 |
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| 作者单位： | 上海理工大学制冷与低温工程研究所，上海 200093 |
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| 基金项目： | 国家自然科学基金面上项目(51676129) |
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| 摘 要： | 针对低温冷链物流应用场合，提出一种由三羟甲基丙烷（TMP）、氯化铵（NH4Cl）和水组成的新型有机-无机复合相变蓄冷材料。首先对该复合材料的不同配比进行DSC热分析实验，筛选出热力性能较优异的材料混合比（TMP∶NH4Cl∶H2O质量比为1.0∶2.0∶7.0）。其次，以上述配比的复合材料为基液，研究了添加不同的纳米粒子（三氧化二铝、二氧化钛、三氧化二铁）对其过冷度、热导率的影响，以及增稠剂（羧甲基纤维素（CMC）、聚丙烯酸钠（PAAS））对其相分离现象的影响，并进行了热循环实验。实验结果表明：添加0.40%(质量分数)的TiO2纳米粒子对降低该复合材料过冷度效果最佳；添加0.50%(质量分数)的TiO2纳米粒子对增大其热导率效果最佳；增稠剂CMC和PAAS可以消除该复合材料相分离现象并对其相变温度、相变潜热、过冷度等热物性影响较小。经优化所得最终复合相变蓄冷材料的配比为以1.0∶2.0∶7.0质量比混合的TMP-NH4Cl-H2O + 0.40%(质量分数)TiO2 + 1.0%(质量分数) PAAS，其相变温度为－19.9℃，相变潜热为246.8 kJ/kg，热导率为0.81 W/(m·K)，并具有较好的循环稳定性。
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| 关 键 词： | 冷链物流 复合材料 蓄冷 相变 热物性 纳米粒子 |
| 收稿时间： | 2018-12-24 |
| 修稿时间： | 2019-04-28 |
Preparation and thermophysical property optimization of a new composite phase change material for cold storage |
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| Puyue JIA,Weidong WU,Yicong WANG,Bing ZHANG. Preparation and thermophysical property optimization of a new composite phase change material for cold storage[J]. Journal of Chemical Industry and Engineering(China), 2019, 70(7): 2758-2765. DOI: 10.11949/j.issn.0438-1157.20181505 |
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| Authors: | Puyue JIA Weidong WU Yicong WANG Bing ZHANG |
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| Affiliation: | Institute of Refrigeration and Cryogenics Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | A new organic-inorganic composite phase change material (PCM) was prepared, which is composed of trimethylolpropane (TMP), ammonium chloride (NH4Cl) and H2O, for the application of cold chain logistic. The composite materials with different ratios were measured by using differential scanning calorimetry (DSC), and a composite PCM with excellent thermal performance was selected, which has a mass ratio of 1.0∶2.0∶7.0 (TMP∶NH4Cl∶H2O). To further optimize its performance, the supercooling degree and thermal conductivity of the PCM were studied by adding nucleating agent ( nano-Al2O3, nano-Fe2O3, nano-TiO2), and phase separation of the PCM was studied by adding thickener, i.e., carboxymethyl cellulose (CMC) or polyacrylic acid sodium (PAAS), and the thermal cyclic experiment was also conducted. The results showed that adding 0.40%(mass) and 0.50%(mass) nano-TiO2 had a better effect on reducing supercooling degree and enhancing thermal conductivity, respectively. CMC and PAAS could eliminate the phenomenon of phase separation with a little influence of thermophysical properties. The final ratio of the PCM was TMP-NH4Cl-H2O mixed at a mass ratio of 1.0∶2.0∶7.0 + 0.4%(mass) TiO2 + 1.0% (mass) PAAS, and the phase-change temperature, latent heat enthalpy and thermal conductivity of the prepared PCM were －19.9℃, 246.8 kJ/kg and 0.81 W/(m·K), respectively. |
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| Keywords: | cold-chain logistics composites cold storage phase change thermophysical properties nanoparticles |
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