储能科学与技术 ›› 2017, Vol. 6 ›› Issue (4): 696-700.doi: 10.12028/j.issn.2095-4239.2017.00043

• 相变储能专刊 • 上一篇    下一篇

双层相变材料组合式蓄冷装置的性能研究

凌子夜，王前蒿，张正国，高学农，方晓明   

  1. 华南理工大学化学与化工学院，传热强化与过程节能教育部重点实验室，广东 广州 510641
  • 收稿日期:2017-04-17 修回日期:2017-05-17 出版日期:2017-07-01 发布日期:2017-07-01
  • 通讯作者: 张正国，教授，主要研究方向相变储能系统，E-mail：cezhang@scut.edu.cn。
  • 作者简介:凌子夜（1989—），男，博士研究生，主要研究方向相变储能材料及其应用，E-mail：zyling@scut.edu.cn
  • 基金资助:
    广东省应用型科技研发专项（2016B020243008），广东省自然科学基金（2014A030312009）项目。

Performance study of a cold storage device with a combination of two phase change materials

LING Ziye, WANG Qianhao, ZHANG Zhengguo, GAO Xuenong, FANG Xiaoming   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Key Laboratory of Enhanced Heat Transfer and Energy Conservation, the Ministry of Education, Guangzhou 510641, Guangdong, China
  • Received:2017-04-17 Revised:2017-05-17 Online:2017-07-01 Published:2017-07-01

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摘要： 实验测试了两种相变温度分别为5.4 ℃和9.6 ℃、相变焓分别为132 kJ/kg和173 kJ/kg的十三烷和十二烷在不同组合模式下对蓄冷装置温度变化的影响。结果表明，十三烷在外层、十二烷在内层的组合模式，尽管总相变潜热在所有组合中仅排第三，但蓄冷装置将内壁温度控制在0 ℃以下的时间最长，与双层同为十二烷的工况相同，高于双层同为十三烷及十三烷在内十二烷在外层的模式。相变温度更高的材料在外层，可以降低环境热量传递至蓄冷装置内部的速率，延长蓄冷时间，有利于提高蓄冷装置的性能。

关键词: 相变材料, 蓄冷, 多层结构

Abstract: Cold storage using phase change materials (PCMs) has wide applications on the transportation of food and medical products. This article presents a study on the performance of a cold storage device with two PCMs in a layered structure. Tridecane and dodecane were used as the PCMs, which have phase change temperatures and phase change enthalpies of −5.4 ℃ and 132 kJ/kg, and −9.6 ℃ and 173 kJ/kg, respectively. The main objective of the study was to find the best combination of the two PCMs giving the longest storage period. The results showed that the combination with tridecane placed outside and dodecane inside gave the longest time for the inner wall temperature to change from −15 ℃ to 0 ℃ although the combination only had the 3rd largest total latent heat. Same conclusions were obtained with pure dodecane, which was longer than the unit with pure tridecane and tridecane located outside layer and dodecane inside. Placing the PCM with a higher phase change temperature in the outside layer reduced the heat transfer rate from the ambient to the internal core of the cold storage unit, leading to an increase in the cold storage period and improvement in the cold storage performance.

Key words: phase change materials, cold storage, multi-layer structure