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Melting and solidification characteristics of cylindrical encapsulated phase change materials
Journal of Energy Storage ( IF 8.9 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.est.2021.103104
Mohammad Yaseen Shaker 1, 2 , Ahmed A. Sultan 2 , Emad A. El Negiry 2 , Ali Radwan 2, 3
Affiliation  

Thermal energy storage using encapsulated phase change materials (EPCM) has been attracting the attention of researchers in solar energy applications due to their high energy storage capabilities. However, the melting characteristics of EPCMs are affected by many parameters. In this study, experimental and CFD model were used to investigate the parameters influencing the melting and solidification characteristics of a cylindrical EPCM. The developed CFD model was validated with the experimental model's results and with experimental data from the literature. The CFD model is used to investigate the effect of changing the PCM type, heat transfer fluid (HTF) temperatures, HTF flowrates, number of fins and solidification temperatures. Lauric acid and paraffin wax at HTF temperature ranging from 55 to 73 °C and flowrates from 0.064 to 0.323 kg/s are compared. Then the number of fins from 4 to 12 were inserted inside the capsule and compared with the case without fins at the same amount of PCM. The solidification is simulated at HTF temperature from 20-35 °C. Results revealed that increasing the HTF flow rate by five times decreases the melting times of lauric acid and paraffin wax by 30% and 22%, respectively. The total energy stored in paraffin wax is much higher compared with that in lauric acid under the same HTF conditions. Furthermore, increasing the number of internal fins in the capsules to 12 enhances the melting time by 41% of paraffin wax at an HTF mass flow rate of 0.3238 kg/s and temperature of 73 °C. The presence of fins effectively enhances the solidification and melting time of lauric acid and paraffin wax.



中文翻译:

圆柱包封相变材料的熔融凝固特性

使用封装相变材料 (EPCM) 的热能存储因其高能量存储能力而吸引了太阳能应用研究人员的关注。然而,EPCMs 的熔化特性受许多参数的影响。在这项研究中,实验和 CFD 模型用于研究影响圆柱 EPCM 熔化和凝固特性的参数。开发的 CFD 模型通过实验模型的结果和文献中的实验数据进行了验证。CFD 模型用于研究改变 PCM 类型、传热流体 (HTF) 温度、HTF 流量、翅片数量和凝固温度的影响。月桂酸和石蜡的 HTF 温度范围为 55 至 73 °C,流速为 0.064 至 0。比较 323 kg/s。然后将 4 到 12 个鳍片插入胶囊内部,并与相同 PCM 量下没有鳍片的情况进行比较。在 20-35 °C 的 HTF 温度下模拟凝固。结果表明,将 HTF 流量增加 5 倍,月桂酸和石蜡的熔化时间分别减少了 30% 和 22%。在相同的HTF条件下,石蜡储存的总能量远高于月桂酸。此外,在 0.3238 kg/s 的 HTF 质量流速和 73 °C 的温度下,将胶囊中的内部翅片数量增加到 12 可将石蜡的熔化时间提高 41%。翅片的存在有效地提高了月桂酸和石蜡的凝固和熔化时间。然后将 4 到 12 个鳍片插入胶囊内部,并与相同 PCM 量下没有鳍片的情况进行比较。在 20-35 °C 的 HTF 温度下模拟凝固。结果表明,将 HTF 流量增加 5 倍,月桂酸和石蜡的熔化时间分别减少了 30% 和 22%。在相同的HTF条件下,石蜡储存的总能量远高于月桂酸。此外,在 0.3238 kg/s 的 HTF 质量流速和 73 °C 的温度下,将胶囊中的内部翅片数量增加到 12 可将石蜡的熔化时间提高 41%。翅片的存在有效地提高了月桂酸和石蜡的凝固和熔化时间。然后将 4 到 12 个鳍片插入胶囊内部,并与相同 PCM 量下没有鳍片的情况进行比较。在 20-35 °C 的 HTF 温度下模拟凝固。结果表明,将 HTF 流量增加 5 倍,月桂酸和石蜡的熔化时间分别减少了 30% 和 22%。在相同的HTF条件下,石蜡储存的总能量远高于月桂酸。此外,在 0.3238 kg/s 的 HTF 质量流速和 73 °C 的温度下,将胶囊中的内部翅片数量增加到 12 可将石蜡的熔化时间提高 41%。翅片的存在有效地提高了月桂酸和石蜡的凝固和熔化时间。

更新日期:2021-09-09
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