添加剂对三水醋酸钠的储热性能影响研究
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摘要
无机相变材料CH_3COONa·3H_2O在相变过程中存在严重的过冷和相分离现象。本文采用步冷曲线法、循环融冻法和差示扫描量热仪等方法,研究成核剂Na_2HPO_4·12H_2O和增稠剂CMC对CH_3COONa·3H_2O过冷度和相分离的影响。结果表明:添加1wt%Na_2HPO_4·12H_2O和2wt%CMC的材料配方效果较理想,可以将平均过冷度控制在约2.6℃;纯组分CH_3COONa·3H_2O、最佳材料配方的相变潜热分别为239.7 J/g,190.5 J/g,相变点分别为58.5℃和57.3℃。改性后的相变材料不仅过冷和相分离问题得到了改善,而且具有相对较高的相变潜热。
Sodium acetate trihydrate( CH_3COONa · 3H_2O) has serious phase segregation and supercooling phenomena during phase change process. Nucleation of CH_3COONa ·3H_2O doped Na_2HPO_4·12H_2O and CMC were researched with gradually cooling method under open system of room temperature cooling. The results showed that the average supercooling degree of CH_3COONa ·3H_2O was reduced to about 2. 6 ℃ with addition of 1wt% Na_2HPO_4·12H_2O and 2wt% CMC. The latent heat and phase change temperature of pure CH_3COONa·3H_2O and CH_3COONa·3H_2O with additive were 239. 7 J/g,190. 5 J/g and 58. 5 ℃,57. 3 ℃,repectively. Modified CH3COONa·3H_2O phase change material not only had a lower supercooling,but also had a higher latent heat.
Sodium acetate trihydrate( CH_3COONa · 3H_2O) has serious phase segregation and supercooling phenomena during phase change process. Nucleation of CH_3COONa ·3H_2O doped Na_2HPO_4·12H_2O and CMC were researched with gradually cooling method under open system of room temperature cooling. The results showed that the average supercooling degree of CH_3COONa ·3H_2O was reduced to about 2. 6 ℃ with addition of 1wt% Na_2HPO_4·12H_2O and 2wt% CMC. The latent heat and phase change temperature of pure CH_3COONa·3H_2O and CH_3COONa·3H_2O with additive were 239. 7 J/g,190. 5 J/g and 58. 5 ℃,57. 3 ℃,repectively. Modified CH3COONa·3H_2O phase change material not only had a lower supercooling,but also had a higher latent heat.
引文
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[12]Wada T,Matsunaga K,Matsuo Y.Studies on salt hydrates for latentheat storage.6.Preheating effect on crystallization of sodium-acetate trihydrate from aqueous-solution with a small amount of disodium hydrogenphosphate[J].Bulletin of the Chemical Society of Japan,1984,57(2):561-563.
[13]阮德水,张太平,胡起柱.Na2HPO4·12H2O-Na CH3COO·3H2O体系相图[J].华中师范大学学报(自然科学版),1991(04):81-84.
[2]顾晓滨,秦善,牛菁菁.相变储能矿物材料研究现状及其展望[J].矿物岩石地球化学通报,2014(6):932-940.
[3]Mohamed SA,Al-Sulaiman FA,Ibrahim NI.A review on current status and challenges of inorganic phase change materials for thermal energy storage systems[J].Renewable and Sustainable Energy Reviews,2016,70:1072-1089.
[4]Milián Y E,Gutiérrez A,Grágeda M.A review on encapsulation techniques for inorganic phase change materials and the influence on their thermophysical properties[J].Renewable and Sustainable Energy Reviews,2017,73:983-999.
[5]张雪梅,蔡路茵,章迪,等.相变储能化合物CHCOONa·3H2O的热分解行为[J].无机化学学报,2010,26(1):67-71.
[6]Gu X,Qin S,Wu X,Li Y,Liu YX.Preparation and thermal characterization of sodium acetate trihydrate/expanded graphite composite phase change material[J].Journal of Thermal Analysis and Calorimetry,2016,125(2):831-838.
[7]Araki N,Futamura M,Makino A,Shibata,H.Measurements of thermophysical properties of sodium acetate hydrate[J].International Journal of Thermophysics,1995,16(6):1455-1466.
[8]徐建霞,柯秀芳.三水合醋酸钠相变储能性能研究[J].材料导报2007,21(11s):319-321.
[9]石海民,梁德青,李栋梁,等.CH3COONa·3H2O相变蓄热性能研究[J].制冷学报,2009,30(2):8-11.
[10]陈志锋,唐志伟.Na2HPO4·12H2O的热分析动力学研究[J].化学工程师,2007,21(1):23-26.
[11]Wada T,Matsunaga K,Matsuo Y.Studies on salt hydrates for latentheat storage.5.Preheating effect on crystallization of sodium-acetate trihydrate from aqueous-solution with a small amount of sodium Pyrophosphate Decahydrate[J].Bulletin of the Chemical Society of Japan,1984,57(2):557-560.
[12]Wada T,Matsunaga K,Matsuo Y.Studies on salt hydrates for latentheat storage.6.Preheating effect on crystallization of sodium-acetate trihydrate from aqueous-solution with a small amount of disodium hydrogenphosphate[J].Bulletin of the Chemical Society of Japan,1984,57(2):561-563.
[13]阮德水,张太平,胡起柱.Na2HPO4·12H2O-Na CH3COO·3H2O体系相图[J].华中师范大学学报(自然科学版),1991(04):81-84.