储能科学与技术 ›› 2023, Vol. 12 ›› Issue (2): 349-356.doi: 10.19799/j.cnki.2095-4239.2022.0531

• 储能材料与器件 • 上一篇    下一篇

脂肪酸类二元储能材料的相变特性与配比调节

董金美1,2(), 刘启元1,2,3, 吴芳1,2, 贾利蕊4, 文静1,2, 常成功1,2, 郑卫新1,2, 肖学英1,2()   

  1. 1.中国科学院青海盐湖研究所，中国科学院盐湖资源综合高效重点实验室
    2.青海省盐湖资源 化学重点实验室，青海 西宁 810008
    3.中国科学院大学，北京 100049
    4.青海省农产品质量 安全检测中心，青海 西宁 810000
  • 收稿日期:2022-09-19 修回日期:2022-10-23 出版日期:2023-02-05 发布日期:2023-02-24
  • 通讯作者: 肖学英 E-mail:dongda839@isl.ac.cn;xxy@isl.ac.cn
  • 作者简介:董金美（1981—），女，博士，研究方向为储能材料技术及其在建筑节能领域的应用，E-mail：dongda839@isl.ac.cn；
  • 基金资助:
    中国科学院西部青年学者项目(2022000018);青海省自然科学基金应用基础研究(2020-ZJ-746)

Phase change characteristics and proportion adjustment of fatty acid binary energy storage materials

Jinmei DONG1,2(), Qiyuan LIU1,2,3, Fang WU1,2, Lirui JIA4, Jing WEN1,2, Chenggong CHANG1,2, Weixin ZHENG1,2, Xueying XIAO1,2()   

  1. 1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences
    2.Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, Qinghai, China
    3.University of Chinese Academy of Science, Beijing 100049, China
    4.Qinghai Agricultural Product Quality and Safety Inspection Center, Xining 810000, Qinghai, China
  • Received:2022-09-19 Revised:2022-10-23 Online:2023-02-05 Published:2023-02-24
  • Contact: Xueying XIAO E-mail:dongda839@isl.ac.cn;xxy@isl.ac.cn

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摘要：

针对单一脂肪酸相变温度固定，与实际需求匹配性差的问题，提出以癸酸(CA)、月桂酸(LA)、十四酸(MA)、软脂酸(PA)和硬脂酸(SA)五种常见的脂肪酸作为相变材料，将其两两复合，利用低共融理论计算10种二元复合体系的最低共融点和理论质量配比，通过熔融共混法制备二元低共融复合体系并在其低共熔点上下3%～6%调节质量配比，借助DSC测试二元低共融复合体系的相变特性。结果表明，二元低共融体系的理论相变温度范围为21.58～53.90 ℃，理论相变潜热范围为157.64～191.85 J/g，与五种单一脂肪酸的热性能相比，相变温度降低了约10～15 ℃，相变潜热值无明显变化；制备的10种二元低共融体系的相变温度范围为19.94～56.49 ℃，与理论相变温度偏差为1.93%～14.72%；相变潜热为125.78～181.45 J/g，与理论相变潜热偏差为0.18%～19.86%；其中CA二元体系的理论相变温度范围为21.58～30.11 ℃，适用于建筑节能领域；LA二元体系的理论相变温度范围为35.87～41.15 ℃，适用于电子器件热管理或调温纺织品领域；MA和PA二元体系的理论相变温度范围为46.05～53.9 ℃，适用于大体积混凝土温控领域；在低共熔点附近调节配比发现最佳配比与理论计算的低共熔配比偏差在4%以内，验证理论计算的准确性和可行性。本研究结果可为脂肪酸类二元复合相变材料的具体使用范围提供技术参考。

关键词: 有机相变材料, 脂肪酸, 二元低共熔, 相变特性

Abstract:

Aiming to solve the problem that the phase change temperature of a single fatty acid is fixed and difficulty in matching the actual demand, we propose taking five common fatty acids—decanoic acid (CA), lauric acid (LA), tetradecanoic acid (MA), palmitic acid (PA) and stearic acid (SA)—as phase change materials and compound them in pairs. The lowest melting point and theoretical mass ratio of 10 binary composite systems are calculated using the low melting theory. A binary low eutectic composite system was prepared by melt blending, and the mass ratio was adjusted by 3%—6% above and below its low eutectic point. The phase change characteristics of the binary low eutectic composite system were measured by DSC. Experimental results show that the theoretical phase change temperature range of the binary low eutectic system is 21.58—53.90 ℃, and the theoretical phase change latent heat range is 157.64—191.85 J/g. Compared with the thermal properties of the five single fatty acids, the phase change temperature is reduced by about 10—15 ℃, and the phase change latent heat value has no obvious change. The phase change temperatures of the 10 binary low eutectic systems range from 19.94 to 56.49 ℃, with a deviation of 1.93%—14.72% from the theoretical phase change temperature. The phase change latent heat range is 125.78—181.45 J/g and the deviation from the theoretical phase change latent heat range is 0.18%—19.86%. The theoretical phase change temperature range of CA binary systems is 21.58—30.11 ℃, which is applicable to the field of building energy conservation. The theoretical phase change temperature range of LA binary systems is 35.87—41.15 ℃, which is suitable for the thermal management of electronic devices or temperature-regulating textiles. The theoretical phase change temperature range of MA and PA binary systems is 46.05—53.9 ℃, which is suitable for the temperature control field of mass concrete. By adjusting the ratio near the eutectic point, we found that the deviation between the optimal ratio and the theoretical calculation of the eutectic ratio was within 4%, verifying the accuracy and feasibility of the theoretical calculation. The results of this study can provide a technical reference for the specific application range of fatty acid binary composite phase change materials.

Key words: organic phase change materials, fatty acids, binary low confluence, phase change characteristics

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