| 摘要: |
| 本文研制了一种用于相变温度在0~5 ℃的冷藏运输系统的二元有机复合相变蓄冷材料。该材料由癸酸和辛酸按比例混合经超声波振荡后制得，质量配比为30:70。通过步冷曲线法测定了不同质量配比的癸酸-正辛酸溶液的相变温度，利用相图确定了二元低共熔共晶点，质量比为30:70。经差示扫描量热仪（DSC）测得共晶溶液的相变温度为1.5 ℃，相变潜热为120.6 J/g。癸酸-正辛酸共晶混合物经过30次、60次结晶与熔化循环后，相变温度、相变潜热均未发生明显变化。测试结果表明，该相变蓄冷材料具有合适的相变温度、较高的相变潜热和良好的循环热稳定性，在蓄冷系统尤其是冷藏运输系统中有着很大的应用潜力。 |
| 关键词: 蓄冷系统 相变材料 差示扫描量热法 热性能 |
| DOI： |
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| 基金项目:“十二五”农村领域国家科技支撑计划（2013BAD19B01）资助项目。 |
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| Preparation and Cycling Performance of Capric Acid-caprylic Acid as Cold Storage Phase Change Material |
| Chen Wenpu,Zhang Xuelai,Ding Jinhong,Mao Fa,Wang Youli |
| (Institute of Cold Storage Technology, Shanghai Maritime University) |
| Abstract: |
| The composite phase change material (PCM) used in the cold storage transportation system with phase change temperature of 0-5 ℃ are proposed in this paper. The material consists of capric acid and caprylic acid, and the mass ratio of its ingredients is 30:70. The composite was prepared by ultrasonic oscillations. The cooling curve method is used to test the phase change temperature of capric acid-caprylic acid in different mass fraction, the phase diagram is used to find the eutectic melting point and the ideal mass ratio is 30:70. The differential scanning calorimetry (DSC) test showed that the melting temperature of the PCM is 1.5 ℃ and the latent heat is 120.6 J/g. After 30 times and 60 times circulation of freezing and melting experiment, the phase change temperature and the latent heat were stable. The results showed that the composite has large potential in the cold storage system, especially in cold storage transportation system, because of suitable phase change temperature, high latent heat, and good thermal stability. |
| Key words: cold storage system phase change material differential scanning calorimety thermal properties |
