寒区地下U型埋管换热器及周围土壤非稳态传热数值模拟  

Numerical Simulation on Unsteady Heat Transfer of Buried U-tube Heat Exchanger and Soil Around the Exchanger in Cold Region

作　　者：陈忠华[1] 杜明俊[1] 马贵阳[1] 戚积功[1] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001

出　　处：《当代化工》2010年第4期442-444,448,共4页Contemporary Chemical Industry

摘　　要：针对东北地区冬季气候特点,建立埋地U型管换热器及周围土壤三维非稳态传热模型,采用有限容积法对方程进行离散,对换热器周围土壤温度场进行数值模拟,分析了不同回填材料的导热性能及对土壤温度场的影响,得到了不同时刻U型管换热器传热特性与土壤温度的变化规律,结果表明:回填材料的导热系数相对越大,换热效果越显著,且采用不同导热系数的材料回填管井,达到稳态之前,不同深度的热作用半径具有不稳定性,模拟符合实际。可为工程设计提供一定的理论依据。According to climate character of northeast area in winter,three-dimension unsteady heat transfer model of buried U-tube heat exchangerand soil around the exchangerwas established.With finite volume method,the equation was discretized,and the soil temperature field was simulated.At the same time,thermal conductivity of different backfill material and its effect on soil temperature field were analyzed,heat transfercharacteristics of U-tube heat exchangerand change law of the soil temperature at different time were gained.The result shows that the greaterrelatively thermal coefficient of backfill material,the more significant effect of heat transfer.Before reaching steady state,if materials with different thermal coefficient are used in backfill pipewell,thermal effect radius will be unsteady at different depth.The simulation result accords with practical condition,which can provide theory basis to engineering design.

关 键 词：U型管换热器 有限容积法 三维非稳态传热 数值模拟 

分 类 号：TQ019[化学工程]