套管式相变蓄热器强化传热研究

Heat transfer enhancement for sleeve thermal energy storage exchanger using phase change materials

蓄热技术可有效解决热能供给与需求在时间和强度上不匹配的矛盾,提高能源利用率。针对蓄热器换热效率低和蓄热器内部温度分布不均匀等问题,结合套管式和多管式蓄热器的换热特性,开发出高效蓄热换热器。研究结果表明,通过添加翅片使相变材料融化过程节省时间66.67%;增加翅片长度能够改善相变材料凝固过程中相变"死区"对整体放热时间的影响,使凝固过程节省时间73%。

Thermal energy storage can improve the efficiency and eliminate the mismatch between the energy supply and energy demand of thermal energy applications. On account of the low thermal efficiency and uneven distribution of internal temperature in the thermal energy storage, combines with the heat transfer characteristics of triple tube and multi-tube heat exchanger, highly efficient thermal energy storage exchanger are developed. The computational results show that the melting time save66.67% by added the fins. The influence of ＂dead zone＂ of solidification on the whole solidification time can improve by increasing the fins＇ length and which can save 73% of the solidification time.