摘要
为了确定渗流对竖直地埋管换热器换热性能的影响,基于多孔介质传热理论与Darcy定律,利用多物理场耦合软件COMSOL建立了三维热渗耦合模型,模拟了有无渗流条件下竖直地埋管换热器周围土壤温度场的变化。结果表明,地下水渗流有助于竖直地埋管换热器换热,且渗流速度越大,竖直地埋管换热器换热效果越明显;平行于渗流方向处温度场偏向下游,垂直于渗流方向处温度场始终保持对称分布,渗流速度由0m/s增大到1.0×10-5 m/s时,对应热作用半径由0.42m减小到0.32m。
In order to analyze the impact of groundwater seepage on the heat transfer performance of vertical geothermal heat exchanger,three-dimensional coupled thermal seepage model was established by using multiple physical fields coupling software COMSOL,which is based on the porous media and Darcy＇s law theory.And then the soil temperature field around the vertical geothermal heat exchanger had been simulated with or without groundwater seepage.The results show that the groundwater seepage is helpful to heat transfer of the vertical geothermal heat exchanger.The greater the groundwater seepage velocity is,the more obvious heat transfer effect of the vertical geothermal heat exchanger is.The soil temperature field is inclined to the downstream,which is parallel to the direction of the groundwater seepage.The distribution of the soil temperature perpendicular to the groundwater seepage direction is always symmetrical.The velocity of groundwater seepage increases from 0m/s to 1×10-5 m/s,the thermal effect radius reduces from 0.42 mto 0.32 m.
出处
《水电能源科学》
北大核心
2015年第10期108-111,107,共5页
Water Resources and Power
基金
国家自然科学基金项目(41372247)
关键词
土壤源热泵
数值模拟
地下水渗流
地埋管换热器
土壤温度场
ground source heat pump
numerical simulation
groundwater seepage
vertical geothermal heat exchanger
soil temperature field
