西安建筑科技大学学报(自然科学版)

选择有机材料RT28HC作为相变蓄热材料,对等壁温(竖向)条件下矩形及楔形蓄热装置的热性能进行对比实验研究,包括蓄热过程典型时刻的相界面记录及多点温度的监测.结果显示:所述矩形及楔形装置均具有二维传热特性; 与传统的矩形装置相比,楔形的几何形状可有效改善装置的竖向温度分布,消除装置底部的传热及融化死角,实现强化传热.热源温度越高时,楔形几何形状的强化传热效果越显著.

An experimental study by contrast on melting performance of the rectangular and wedge-shaped thermal storage units was conducted. The organic RT28HC is employed as latent heat thermal energy storage material and melts in the unit heated from one vertical side. The solid-liquid interface distribution is recorded and temperature of multipoint is monitored during the melting process. Results show that both the rectangular and wedge-shaped unit show two-dimensional heat transfer characteristics. Compared with the traditional rectangular unit, there are significant improvements in the temperature distribution and melting process of wedge-shaped unit. The dead space of melting and heat transfer has been eliminated in this geometry, so the wedge-shaped unit can enhance the heat transfer of melting. Moreover, the higher the heat source temperature is the more significant is the heat transfer enhanced.

引言
1 实验装置及过程
2 实验结果及分析
3 结论

图1 实验装置示意图<br/>Fig.1 Schematic diagram of the experimental apparatus

图1 实验装置示意图
Fig.1 Schematic diagram of the experimental apparatus

表1 矩形及楔形蓄热装置的几何尺寸<br/>Tab.1 Geometric dimensions of the rectangular and wedge-shaped unit

表1 矩形及楔形蓄热装置的几何尺寸
Tab.1 Geometric dimensions of the rectangular and wedge-shaped unit

图2 蓄热装置的测点分布图<br/>Fig.2 Arrangement of thermocouples inside the thermal storage units

图2 蓄热装置的测点分布图
Fig.2 Arrangement of thermocouples inside the thermal storage units

图3 蓄热装置的二维传热特性<br/>Fig.3 Two dimensional heat transfer characteristics of

图3 蓄热装置的二维传热特性
Fig.3 Two dimensional heat transfer characteristics of

图4 Tw=40 ℃时蓄热过程的相界面分布<br/>Fig.4 Instantaneous photographs of the RT28HC melting in for hot wall temperature of 40 ℃

图4 Tw=40 ℃时蓄热过程的相界面分布
Fig.4 Instantaneous photographs of the RT28HC melting in for hot wall temperature of 40 ℃

图5 装置中心温度随时间的变化曲线<br/>Fig.5 Temperature variations in the center of

图5 装置中心温度随时间的变化曲线
Fig.5 Temperature variations in the center of

图6 Tw=40 ℃时不同高度测点温度随时间的变化<br/>Fig.6 Temperature variations of a series of different heights of for hot wall temperature of 40 ℃

图6 Tw=40 ℃时不同高度测点温度随时间的变化
Fig.6 Temperature variations of a series of different heights of for hot wall temperature of 40 ℃

图7 Tw=40 ℃时装置底部T2j测点的温度分布<br/>Fig.7 Temperature distributions of T2j series at the bottom of for hot wall temperature of 40 ℃

图7 Tw=40 ℃时装置底部T2j测点的温度分布
Fig.7 Temperature distributions of T2j series at the bottom of for hot wall temperature of 40 ℃

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备注

引言

1 实验装置及过程

2 实验结果及分析

3 结论

期刊信息