列管式相变储能换热器强化换热的数值研究  

Numerical Study on Heat Transfer Enhancement of the Cross-Flow Latent Thermal Energy Storage Heat Exchanger

作　　者：韩广顺[1] 丁红胜[1] 童莉葛[2,3] 

机构地区：[1]北京科技大学数理学院,北京100083 [2]北京科技大学机械工程学院,北京100083 [3]北京科技大学北京市高效节能与环保研究中心,北京100083

出　　处：《工程热物理学报》2016年第9期2012-2018,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51206010);国家重点基础研究发展计划项目(973项目)(No.2012CB720406)

摘　　要：在考虑自然对流的情况下,利用FLUENT软件研究了进口工况、模型结构、相变材料物性及相变材料组合对列管式相变储能换热器储热换热性能的影响。结果表明:在进口功率一定的条件下,提高进口温度或进口速度对强化换热效果影响不大;管内添加翅片及提高相变材料导热系数对强化换热较为显著,最佳的翅片结构较光管结构的完全熔化时间缩短了30.7%,但在一定程度上削弱了自然对流的作用;对于管列数较多的情况,使用相变材料组合是一种有效的强化换热方式.By using FLUENT software,the paper studied the effects of various factors on performance of energy storage and heat transfer in cross-flow latent thermal energy storage heat exchanger,including inlet conditions,model structure,phase change material（PCM） properties and multiple phase change materials.Natural convection was considered in the modeling.The results showed that,given a certain inlet power,the increasing of the inlet temperature or inlet velocity had little effect on heat transfer enhancement.The heat transfer process was significantly enhanced by installing fins in tube and improving the thermal conductivity of PCM.Compared with the no-fins model,the completed melting time of PCM in model with best fins was reduced by 30.7%.But to some extent,it weakened the effect of natural convection on heat transfer enhancement.For cases with many pipe columns,using multiple phase change materials is an effective way of enhancing heat transfer.

关 键 词：强化换热 相变材料 储能换热器 自然对流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]