流体机械

2012, v.40;No.483(09) 56-61

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垂直埋管换热器布置形式对地下换热特性的影响分析
Heat Transfer Analysis of Vertical Underground Hear Exchanger under Different Layout Forms of Pipe-groups

周晋;汪庆军;张国强;
ZHOU Jin,WANG Qing-jun,ZHANG Guo-qiang(Hunan University,Changsha 410082,China)

摘要(Abstract):

基于地源热泵地埋管换热器钻孔内准三维传热模型和钻孔外有限长线热源模型,采用温度叠加原理,编写地下换热系统计算程序,通过引入管群横截面水力半径的概念,研究了管群不同布置形式对地埋管换热器换热效果的影响。研究结果表明:在匀强交变脉冲热流作用下,当向地下吸热放热平衡时,管群的布置形式对地埋管换热器换热影响不显著;当吸热放热不平衡时,管群的布置形式对地埋管换热器换热影响较大,水力半径小的布置换热效果较好;并推出即使地埋管换热器向地下土壤吸热放热不平衡,只要不平衡率不高,通过设计合理的管群布置形式,单独的地源热泵空调系统依然可以长期正常运行。
Based on the quasi-3-dimensional heat transfer model inside the borehole and the finite line heat source theory outside the borehole of ground heat exchangers,by using superposition principle of temperatures,writing heat transfer program of ground heat exchangers.By introducing concept of hydraulic radius of pipe-groups cross section,heat transfer performance of ground heat exchangers was analyzed under different layout forms of pipe-groups.The results show that the layout form of pipe-groups has little influence on heat transfer performance of ground heat exchanger when ground soil endothermic and exothermic balance;But the layout form of pipe-groups has greater influence on heat transfer performance of ground heat exchanger when ground soil endothermic and exothermic imbalance.And the simulation results indicate that if ground soil endothermic and exothermic imbalance,through the rational design of the pipe-groups,the independent ground source heat pump system can still be long-term normal operation.

关键词(KeyWords): 地埋管换热器;传热模型;交变脉冲热流;管群布置形式;水力半径
ground heat exchanger;heat transfer model;alternating pulse heat flux;pipe-groups layout;hydraulic radius

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基金项目(Foundation): 国家“十一五”科技支撑计划课题资助(2006BAJ04A13)

作者(Author): 周晋;汪庆军;张国强;
ZHOU Jin,WANG Qing-jun,ZHANG Guo-qiang(Hunan University,Changsha 410082,China)

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