储能科学与技术 ›› 2023, Vol. 12 ›› Issue (12): 3663-3669.doi: 10.19799/j.cnki.2095-4239.2023.0482

• 复合储热专辑 • 上一篇    下一篇

应用于低温集热蓄热的二十二烷-十二醇复合相变材料的制备和性能

陈红兵1(), 李春阳1, 王聪聪1(), 李璊2, 卢浩阳1, 刘宇航1, 张岩1   

  1. 1.北京建筑大学供热、供燃气、通风及空调工程重点实验室，北京 100044
    2.北京市热力集团有限责任公司石景山分公司，北京 100043
  • 收稿日期:2023-07-17 修回日期:2023-08-26 出版日期:2023-12-05 发布日期:2023-12-09
  • 通讯作者: 王聪聪 E-mail:chenhb@bucea.edu.cn;wangcongcong@bucea.edu.cn
  • 作者简介:陈红兵（1977—），男，教授，硕士生导师，主要从事太阳能PV/T系统及相变流体研究，E-mail：chenhb@bucea.edu.cn；
  • 基金资助:
    中共北京市委组织部北京市优秀人才培养项目(24269220005)

Preparation and properties of binary composite phase-change materials based on solar low-temperature heat storage

Hongbing CHEN1(), Chunyang LI1, Congcong WANG1(), Men LI2, Haoyang LU1, Yuhang LIU1, Yan ZHANG1   

  1. 1.Beijing Municipal Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
    2.Beijing Thermal Power Group Co. , Ltd. Shijingshan Branch, Beijing 100043, China
  • Received:2023-07-17 Revised:2023-08-26 Online:2023-12-05 Published:2023-12-09
  • Contact: Congcong WANG E-mail:chenhb@bucea.edu.cn;wangcongcong@bucea.edu.cn

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摘要：

为使相变材料更好覆盖太阳能PV/T系统中电池背板的工作温度范围，提高系统的储热能力。本工作首先采用熔融混合法制备了不同质量分数的二十二烷-十二醇(DE-CP)二元相变材料，并对其潜热进行测试分析。其中，二元相变材料的相变温度区间为20～50 ℃，基本覆盖PV/T系统中电池背板的工作温度；相比于其他二元相变材料，DE质量分数为60%的二元相变材料的潜热值最大，为243.8 kJ/kg；并且DE与CP质量配比为6∶4的二元相变材料的高温度相变峰面积大于低温度相变峰面积，两个相变峰的分布说明，DE质量分数为60%的二元相变材料更加适合在太阳能PV/T系统中应用。然后在二元相变材料中添加EG(膨胀石墨)作为支撑材料，通过吸附增强其导热能力，最终得到复合相变材料。并对其潜热、相容性、导热性进行测量和分析，结果表明DE-CP/EG复合相变材料的相变温度区间仍为20～50 ℃，三种原材料的相容性好，导热系数由原来二元相变材料的0.135 W/(m·K)提升至1.383 W/(m·K)，解决了相变材料自身导热系数低的问题，为后续复合相变材料在太阳能PV/T系统中的应用提供借鉴参考。

关键词: 复合相变材料, 二十二烷, 十二醇, 膨胀石墨, 热性能, 储热

Abstract:

The working temperature range for the battery backplane and the heat storage capacity in solar PV/T systems using phase-change materials need to be improved. In this report, docosane-dodecanol (DE-CP) binary phase-change materials with different mass fractions were prepared using the melt-mixing method, and their latent heat was tested and analyzed. The phase-change temperature range for the binary phase-change material is 20–50 ℃, which essentially covers the working temperature for the battery backplane in the PV/T system. Compared with other binary phase-change materials, the latent heat of the binary phase-change material with 60% DE mass fraction is the largest at 243.8 kJ/kg. Moreover, the high-temperature phase-change peak area for the binary phase-change material with a mass ratio of DE to CP of 6∶4 is larger than the low-temperature phase-change peak area. The distribution of the two phase-change peaks indicates that the binary phase-change material with a DE mass fraction of 60% is more suitable for application in solar PV/T systems. EG (expanded graphite) was then added to the binary phase-change material as a supporting substance to adsorb the material to enhance its thermal conductivity; finally, the composite phase-change material was obtained. The latent heat, compatibility, and thermal conductivity of DE-CP/EG composite phase-change material were measured and analyzed. The results show that the phase-change temperature range for the DE-CP/EG composite phase-change material remains at 20?–?50 ℃. There is good compatibility among the three raw materials, and the thermal conductivity increases from 0.135 W/(m·K) for the original binary phase-change material to 1.383 W/(m·K), which solves the problem of the low thermal conductivity of the phase-change material and provides a reference for the application of the composite phase-change material in solar PV/T systems.

Key words: composite phase change materials, docosane, lauryl alcohol, expanded graphite, thermal performance, heat storage

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