相变储能-毛细嵌管单元动态传热特性研究  

Dynamic Heat Transfer Characteristics of Phase Transition Energy Storage-capillary Embedded Tube Unit

作　　者：夏凡 李小华(指导)[1] 王平 苏欢 万鸿宇 覃向阳 XIA Fan;LI Xiaohua;WANG Ping;SU Huan;WAN Hongyu;QIN Xiangyang(School of Architecture and engineering,Hunan Institute of Engineering,Xiangtan 411100,Hunan,China)

机构地区：[1]湖南工程学院建筑工程学院,湖南湘潭411100

出　　处：《建筑节能（中英文）》2023年第7期55-61,共7页Building Energy Efficiency

基　　金：湖南省自然科学基金资助项目(2021JJ50102);湖南省教育厅科学研究项目(20B133,18B383);创新训练项目(202111342015)。

摘　　要：介于焓-多孔介质法在相变蓄热研究领域较为成熟,非常适用于相对复杂的相变过程所呈现出非线性物理场的计算。因此采用焓-多孔介质法,通过改变换热流体(水)的进口温度和流速对毛细嵌管单元动态传热性能的影响,观察相变区域的多孔度-液相率的大小与嵌管特定位置的温度情况,并通过实验所测数据进行对比验证。最后得出进口温度为283 K、流速为0.5 m/s时各截面的液相分数最小,对比3种进口工况发现,283 K、288 K、293 K分别在4200 s、4800 s、5750 s达到换热稳定状态,283 K工况相对于288 K、293 K工况分别节省12.5%和26.9%的换热时间。进一步研究嵌管结构方式(直管、螺旋管、U型管)对系统循环换热效率的影响,发现相同进口状态下螺旋管使相变材料的换热效果最佳。该结论可为相变蓄热领域的研究奠定基础和提供参考。The enthalpy-porous medium method is relatively mature in the field of phase transition heat storage research,which is very suitable for the calculation of the nonlinear physical field presented by the relatively complex phase transition process.Therefore,the enthalpy-porous medium method is used to observe the effect of the inlet temperature and flow rate of the dynamic heat transfer properties of the phase change region and the temperature of the specific position,and verify the experimental data.Finally,the liquid phase fraction of each section was minimum at 283 K flow rate of 0.5 m/s.Compared with the three import conditions,283 K,288 K and 293 K were stable at 4200 s,4800 s and 5750 s,and 283 K saved 12.5%and 26.9%compared with 288 K and 293 K,respectively.The influence of embedded tube structure(straight pipe,spiral tube,u-type tube)on the circulating heat exchange efficiency of the system is studied.The spiral tube makes the best phase conversion material under the same import state.The conclusion can lay the foundation and provide a reference for the field of phase transition heat storage.

关 键 词：相变储能 液相率 数值模拟 焓-多孔介质模型 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程] TK02[动力工程及工程热物理]