矩形翅片管糖醇相变储热器传热性能分析

HEAT TRANSFER PERFORMANCE ANALYSIS OF RECTANGULAR FINNED TUBE SUGAR ALCOHOL PHASE CHANGE HEAT RESERVOIR

对糖醇基矩形翅片管相变储热器传热性能进行数值模拟与实验研究,利用数值模型研究传热流体入口温度、流量以及储热器翅片间距、管间距等参数对充放热性能的影响。研究表明:从运行参数看,由于相变材料导热系数的影响,翅片强化区外流体入口温度与材料相变温度的温差对充放热速率呈正相关;在管内湍流条件下,管内流速在高于0.53 m/s时,不能显著提升储热器的充放热速率;从结构参数看,增加翅片可显著提升翅片区内充放热速率,翅片间距小于10 mm和管间距小于52.5 mm对充放热速率影响不明显。

The numerical simulation and experimental study of the heat transfer performance of a sugar-alcohol-based rectangularfinned tube phase-change heat resevoir were carried out in this paper.The effects of the heat transfer fluid inlet temperature,flow rate,and parameters such as the heat exchanger fin spacing and tube spacing on the heat charging and discharging performance were investigated using numerical models.The study shows that,from the operating parameters,the temperature difference between the fluid inlet temperature outside the fin-reinforced zone and the material phase change temperature is positively related to the heat charging and discharging rate due to the influence of the thermal conductivity of the phase change material;under the condition of turbulent flow inside the tube,the flow rate inside the tube cannot significantly improve the heat charging and discharging rate of the heat reservoir when it is higher than 0.53 m/s;from the structural parameters,increasing the fins can significantly improve the heat charging and discharging rate inside the fin zone.The effect of fin spacing less than 10 mm and tube spacing less than 52.5 mm on the heat charging and discharging rate was not significant.The relevant research can provide theoretical support for the design and thermal management of systems such as building-side high proportion solar thermal storage and heating.