Abstract

The charging process of solar power applied leaf venation shape bionic latent heat thermal energy storage (LHTES) system was studied in the present research. n-Eicosane was chosen for the phase change materials (PCMs) and the enthalpy porosity method and Boussinesq approximation were applied. A series of transient three-dimensional models built by structure mesh were established to calculate the LHTES charging process. The leaf venation shape bionic surface extension was settled at five different locations to match the effect of natural convection caused by material expansion in the melting process. Parameters of the average temperature, melting fraction, velocity magnitude, and the ratio of latent heat for total energy absorbed were analyzed. The result indicated that the leaf venation shape bionic structure extension and its position on the Z axis have a large impact on the X, Y, Z direction heat diffusion, and the best distance to improve thermal consistency was speculated to be at between 1 and 2 mm from bottom.

摘要

本研究对太阳能应用叶脉状仿生潜热蓄热（LHTES）系统的充电过程进行了研究。n-二十烷被选择用于相变材料 (PCM)，并应用了焓孔隙率方法和 Boussinesq 近似。建立了一系列由结构网格构建的瞬态三维模型来计算LHTES充电过程。叶脉形状仿生表面延伸被安置在五个不同的位置，以匹配熔化过程中材料膨胀引起的自然对流的影响。分析了平均温度、熔化分数、速度大小和潜热占总吸收能量的比率等参数。结果表明，叶脉状仿生结构延伸及其在Z轴上的位置对X , Y , Z轴方向有较大影响。 方向热扩散，据推测，提高热一致性的最佳距离在距底部 1 到 2 毫米之间。