月桂酸基二元低共融储能材料的制备及热性能

doi:10.16085/j.issn.1000-6613.2023-0893

摘要/Abstract

摘要：

相变材料的潜热储能技术利用于建筑节能领域。以月桂酸（LA）为基础，引入石蜡（PW）和癸酸（CA），研究月桂酸基二元相变材料的热性能、稳定性及可靠性。通过理论预测得到LA-PW、LA-CA的相变温度为35.75℃和18.11℃，通过实验得到LA-PW的最佳比例为76∶24，LA-CA的最佳比例为30∶70。LA-PW、LA-CA的相变温度分别为37.45℃和17.82℃，与理论值相差1.70℃、0.29℃，相变潜热分别为186.9J/g、129.16J/g。FTIR和XRD分析发现LA-PW、LA-CA都没产生新物质，为纯物理结合且在蓄放热实验过程中表现出良好的储热性能。热重分析可以看出在100℃内，LA-PW、LA-CA都没有发生热解现象，表现出良好的热可靠性。经过500次冷热循环后LA-PW、LA-CA的相变温度最大差率分别为9.5%、2.15%，相变潜热最大差率分别为3.8%、3.27%，能保持较好的稳定性和蓄热性能，适用于建筑行业的节能研究应用。

关键词: 脂肪酸, 复合相变材料, 潜热储能, 热可靠性, 建筑节能

Abstract:

The latent heat energy storage technology of phase change materials is utilized in the field of energy saving in buildings. Based on lauric acid (LA), paraffin wax (PW) and capric acid (CA) were introduced to investigate the thermal properties, stability and reliability of lauric acid-based binary phase change materials. The phase transition temperatures of LA-PW and LA-CA were obtained from theoretical predictions to be 35.75℃ and 18.11℃, respectively. The optimal ratio of LA-PW was obtained experimentally as 76∶24 and the optimal ratio of LA-CA as 30∶70. The phase transition temperatures of LA-PW and LA-CA were 37.45℃ and 17.82℃, respectively, which differed from the theoretical values by 1.70℃ and 0.29℃, and the latent heats of phase transition were 186.9J/g and 129.16J/g, respectively. The FTIR and XRD showed that LA-PW and LA-CA did not produce any new material and were purely physically bonded withgood thermal storage performance during the heat storage and exothermic experiments. Thermogravimetric analysis showed that no pyrolysis occurred in LA-PW and LA-CA within 100℃, showing good thermal reliability of them. The maximum variation rates of phase change temperature of LA-PW and LA-CA during 500 cold and hot cycles were 9.5% and 2.15% respectively, and the maximum variation rates of latent heat of phase change were 3.8% and 3.27% respectively, demonstrating LA -PW and LA-CA hadgood stability and heat storage performance, and were suitable for energy-saving research applications in the building industry.

Key words: fatty acids, composite phase change materials, latent heat energy storage, thermal reliability, building energy efficiency

中图分类号:

TK02

梁西妹, 费华, 李元林, 雍帆, 郭梦倩, 周嘉宏. 月桂酸基二元低共融储能材料的制备及热性能[J]. 化工进展, 2024, 43(6): 3256-3267.

LIANG Ximei, FEI Hua, LI Yuanlin, YONG Fan, GUO Mengqian, ZHOU Jiahong. Preparation and thermal properties of lauric acid-based binary low compatible energy storage materials[J]. Chemical Industry and Engineering Progress, 2024, 43(6): 3256-3267.

图/表 13

图1 LA-PW、LA-CA二元相变材料的制备过程

图2 二元共晶体系相图

图3 LA-PW、LA-CA的二元共晶体系理论平衡相图

图4 LA-PW、LA-CA的步冷曲线

图5 LA-PW、LA-CA的T-X相图

表1 相变材料的热物性参数

相变材料	融化温度T_m/℃	融化焓ΔH_m/J·g^-1	凝固温度T_f/℃	步冷测试温度T′_f/℃	凝固焓ΔH_m/J·g^-1
LA	43.68	179.32	38.30	41.57	182.05
PW	54.24	193.08	52.22	51.31	195.33
CA	29.33	160.35	28.60	29.52	162.09
LA-PW(75∶25)	38.14	178.02	33.29	36.95	180.12
LA-PW(76∶24)	37.45	186.90	32.11	35.21	182.95
LA-PW(77∶26)	38.09	174.58	33.60	35.89	178.41
LA-CA(29∶71)	17.84	127.69	16.52	17.93	128.65
LA-CA(30∶70)	17.82	129.16	16.46	17.31	130.20
LA-CA(31∶69)	17.83	129.19	16.47	17.86	130.72

图6 LA、PW、CA、LA-PW和LA-CA的DSC曲线

图7 LA、PW、CA、LA-PW和LA-CA的FTIR曲线

图8 LA、PW、CA、LA-PW和LA-CA的XRD曲线

图9 LA-PW、LA-CA的蓄、放热曲线

图10 LA、PW、CA、LA-PW和LA-CA的热重曲线

图11 LA-PW、LA-CA循环前后的热物性曲线

图12 LA-PW、LA-CA的化学稳定性

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