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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study on transient thermal energy storage of microencapsulated phase change material particles in an enclosure
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Experimental and numerical study on transient thermal energy storage of microencapsulated phase change material particles in an enclosure

机译：密闭空间中微胶囊相变材料颗粒瞬态热能存储的实验和数值研究

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摘要

This work aims to examine, via a complementary approach of experimental measurement and numerical simulation, transient characteristics of thermal energy storage in an enclosure filled with microencapsulated phase change material (MEPCM) particles. The core phase change material of the MEPCM is n-octadecane with melting temperature about T_M = 24 ℃. The two vertical surfaces of the enclosure are, respectively, maintained at hot and cold temperatures, while the horizontal surfaces are kept thermally insulated. The study has been performed for nine sets of the hot and cold wall temperatures with the corresponding dimensionless parameters ranges: Stefan number Ste_m = 0.063-0.251; subcooling factor Sb_c = 0.0-0.75. To further elucidate the relevant heat transfer characteristics, numerical simulations have been carried out based on a mathematical modeling of the experimental configuration considered. The results disclosed that the faster melting is experienced for the system with higher Stefan number and the subcooling number is the main parameter to dominate the thermal latent heat storage of the MEPCM system. Besides, the dimensionless accumulated energy through the hot wall Q_h~* is well correlated with the relevant parameters, including the Stefan number St_m, the subcooling parameter Sb_c, and the Fourier number F_o.
机译：这项工作旨在通过实验测量和数值模拟的一种补充方法，研究在装有微胶囊相变材料（MEPCM）颗粒的外壳中，热能存储的瞬态特性。 MEPCM的核心相变材料是正十八烷，熔化温度约为T_M = 24℃。外壳的两个垂直表面分别保持在高温和低温下，而水平表面则保持隔热。已经对九组冷热壁温度进行了研究，并具有相应的无量纲参数范围：Stefan数Ste_m = 0.063-0.251；过冷系数Sb_c = 0.0-0.75。为了进一步阐明相关的传热特性，已经基于所考虑的实验配置的数学模型进行了数值模拟。结果表明，对于具有较高Stefan数的系统，熔化速度更快，过冷数是控制MEPCM系统的潜热储能的主要参数。此外，通过热壁Q_h〜*的无量纲累积能量与包括斯蒂芬数St_m，过冷参数Sb_c和傅立叶数F_o在内的相关参数具有良好的相关性。

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