Paria S, Sarhan A A D, Goodarzi M S, Baradaran S, Rahmanian B, Yarmand H, Alavi M A, Kazi S N, Metselaar H S C
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia ; Department of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut 71516, Egypt.
ScientificWorldJournal. 2015;2015:291657. doi: 10.1155/2015/291657. Epub 2015 Mar 23.
An experimental as well as numerical investigation was conducted on the melting/solidification processes of a stationary phase change material (PCM) in a shell around a finned-tube heat exchanger system. The PCM was stored in the horizontal annular space between a shell and finned-tube where distilled water was employed as the heat transfer fluid (HTF). The focus of this study was on the behavior of PCM for storage (charging or melting) and removal (discharging or solidification), as well as the effect of flow rate on the charged and discharged solar thermal energy. The impact of the Reynolds number was determined and the results were compared with each other to reveal the changes in amount of stored thermal energy with the variation of heat transfer fluid flow rates. The results showed that, by increasing the Reynolds number from 1000 to 2000, the total melting time decreases by 58%. The process of solidification also will speed up with increasing Reynolds number in the discharging process. The results also indicated that the fluctuation of gradient temperature decreased and became smooth with increasing Reynolds number. As a result, by increasing the Reynolds number in the charging process, the theoretical efficiency rises.
针对翅片管换热器系统外壳内固定相变材料（PCM）的熔化/凝固过程开展了一项实验及数值研究。PCM存储在外壳与翅片管之间的水平环形空间内，其中使用蒸馏水作为传热流体（HTF）。本研究的重点在于PCM的存储（充电或熔化）和移除（放电或凝固）行为，以及流速对充放电太阳能热能的影响。确定了雷诺数的影响，并将结果相互比较，以揭示随着传热流体流速变化存储热能的量的变化。结果表明，将雷诺数从1000增加到2000时，总熔化时间减少了58%。在放电过程中，凝固过程也会随着雷诺数的增加而加速。结果还表明，随着雷诺数的增加，梯度温度的波动减小并变得平滑。因此，在充电过程中增加雷诺数，理论效率会提高。
