Encapsulated phase change materials for thermal energy storage: Experiments and simulation
Encapsulated phase change materials for thermal energy storage: Experiments and simulation
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DOI：
10.1002/er.773
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发表时间：
2002-02-01
影响因子：
4.6
通讯作者：
Zhu, HJ
中科院分区：
文献类型：
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作者：
Hawlader, MNA;Uddin, MS;Zhu, HJ
在本研究中，封装相变材料（PCM）用于储存热能。通过实验和模拟来评估封装 PCM 的特性。在填充床中进行测试以确定封装 PCM 的性能。在制备封装 PCM 时，使用了凝聚技术。封装的PCM的性能从封装率、亲水性和储能能力方面进行评价。基于表面响应法设计实验来优化加工条件。结果发现，较高的涂层与石蜡比率导致较高的石蜡包封率。包封石蜡的亲水性值主要取决于石蜡与包衣的比例。该比例越高，其产品的亲水性越低。当石蜡与涂料的比例恒定时，较高浓度的甲醛导致产物的亲水性较低。根据石蜡与涂层的不同比例，封装的石蜡在其相变过程中表现出巨大的能量存储和释放能力（20-90 J g(-1)）。热循环试验表明，封装石蜡在运行1000次循环后仍保持其几何轮廓和储能能力。在封装PCM填充床中流体加热过程的实验和模拟中，结果表明FLUENT 4.47中的欧拉颗粒多相模型适合模拟此类系统。版权所有 (C) 2002 John Wiley Sons, Ltd.
In the present study, encapsulated phase change materials (PCMs) were used for the storage of thermal energy. Both experiments and simulation were performed to evaluate the characteristics of encapsulated PCMs. Tests were conducted in a packed bed to determine the performance of the encapsulated PCM.In the preparation of encapsulated PCMs, the coacervation technique was used. The performance of the encapsulated PCM was evaluated in terms of encapsulation ratio, hydrophilicity, and energy storage capacity. The experiments were designed, based on surface response method, to optimize the processing conditions. It was found that a higher coating to paraffin ratio led to a higher paraffin encapsulation ratio. The hydrophilicity value of encapsulated paraffin depended mainly on the ratio of paraffin to coating. The higher the ratio, the lower was its product hydrophilicity. When the paraffin to coating ratio was constant, the hi-her concentration of HCHO led to a lower hydrophilicity of the product. The encapsulated paraffin has shown large energy storage and release capacity (20-90 J g(-1)) during its phase changes depending on different ratios of paraffin to coating. Thermal cyclic test showed that encapsulated paraffin kept its geometrical profile and energy storage capacity even after 1000 cycles of operation.In the experiments and simulation of fluid heating process in encapsulated PCM charged packed bed, results showed that Eulerian granular multiphase model in FLUENT 4.47 is suitable for simulation of such a system. Copyright (C) 2002 John Wiley Sons, Ltd.