摘要
针对太阳能利用过程中的蓄热储能问题及螺旋槽管换热器的优点,将螺旋槽管引入太阳能相变蓄热器中,并对蓄热器的蓄热过程进行了数值模拟。首先以光滑管蓄热器为例实验验证了该模拟方法和所用模型的可靠性,进而以螺旋槽管为水流管道、相变材料为蓄热介质,利用Gambit建立三维蓄热器模型,应用ICEM对几何模型进行网格划分,运用流体计算软件Fluent模拟计算螺旋槽管和光滑管相变蓄热器的蓄热过程,考察螺旋槽管的强化传热效果。模拟计算螺旋槽管蓄热器不同槽纹节距和槽深等结构参数对蓄热器蓄热过程的影响,并对其影响规律进行了分析。结果表明,螺旋槽管代替光滑管用于太阳能相变蓄热器,可有效提高相变蓄热过程中的对流换热强度和传热能力,缩短蓄热时间,在模拟范围内,得到的最佳螺旋槽管结构参数为节距p=7mm,槽深e=0.4mm。螺旋槽管传热性能良好,对其深入研究有望进一步改进相变蓄热器的设计方案。
Based on the energy storage problems for solar energy utilization and the advantages of spiral groove tube heat exchanger,spiral groove tubes are used in the solar energy phase change heat storage,with numerical simulation of the thermal storage process of heat reservoir.Firstly,the simulation method and the reliability of the used model are verified experimentally with smooth tube.Using spiral groove tube as water flow pipe and phase change material as heat storage medium,building the three-dimensional model by Gambit software and meshing by ICEM,the heat storage process in the spiral groove tube and smooth tube heat storage are numerically simulated while the heat transfer enhancing effect is investigated.The influence of structural parameters such as groove pitch and groove depth on the heat storage process is simulated numerically and the influence rules are analyzed.The results show that the convective heat transfer intensity and heat transfer capability are enhanced when the smooth tubes are substituted by spiral groove tubes in the phase change heat storage and the heat storage time become shorter.In the range of simulation,the optimal structural parameters of spiral groove tube is that the groove pitch p=7 mm and groove depth e=0.4 mm.The further improved design of phase change thermal storage can be realized in later research in-depth.
作者
蒋静智
罗威
薄林
李伟
崔海亭
JIANG Jingzhi;LUO Wei;BO Lin;LI Wei;CUI Haiting(School of Mechanical Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)
出处
《河北科技大学学报》
CAS
2018年第5期462-469,共8页
Journal of Hebei University of Science and Technology
基金
国家自然科学基金(51706058)
关键词
太阳能
相变蓄热
螺旋槽管
强化传热
数值模拟
solar energy
phase change thermal storage
spiral grooved tube
heat transfer enhancement
numerical simulation
