摘要
为了探究地下水渗流对竖直U型地埋管周围土壤温度场的影响,基于多孔介质传热传质和热渗耦合作用,建立了二维地下渗流条件下的传热模型。分析了有无渗流作用,地埋管周围土壤温度场的变化规律,在此基础上探究了地下水渗流速度、土壤热物性参数、热泵运行模式等因素对土壤温度场的影响,研究表明:地下水渗流的作用导致地埋管周围土壤温度场沿渗流方向产生了拉伸,且拉伸幅度随渗流速度的增加而增加;渗流速度越大土壤温度场稳定所需的时间越短且稳定后温度越低;在其他条件不变时,土壤导热系数越大土壤温度场拉伸的幅度愈大;热泵间歇运行模式下在渗流影响区内土壤温度呈现等幅波动,沿渗流方向随振幅径向距离增加而降低,对于渗流影响区以外土壤温度基本不受影响。
In order to explore the influence of groundwater seepage on soil temperature field around vertical U-type buried pipe,based on the coupling of heat and mass transfer and thermal infiltration in porous media,a heat transfer model is built under two dimensional underground seepage,analyzing the changing rule of soil temperature field around buried pip,whether there is seepage or not,and investigating the effects of groundwater seepage velocity,soil thermo physical parameters and heat pump operation mode on soil temperature field.The research results show that the effect of groundwater seepage leads to the stretching of soil temperature field around buried pipe along the direction of seepage,and the stretching amplitude increases with the increase of seepage velocity.The greater the seepage velocity,the shorter the time required for soil temperature stability and the lower the temperature after stabilization.When other conditions are unchanged,the greater the thermal conductivity of soil,the greater the extent of soil temperature field stretching.Under the intermittent operation mode of the heat pump,the soil temperature in the seepage affected zone fluctuates in an equal amplitude,and decreases along the direction of seepage flow with the increase of amplitude and radial distance,which has little effect on the soil temperature outside the seepage affected zone.
作者
刘卫
张之强
刘琬铭
刘鹏
郭洁
徐博荣
LIU Wei;ZHANG Zhi-qiang;LIU Wan-ming;LIU Peng;GUO Jie;XU Bo-rong(Shaanxi Architectural Design and Research Institute Co.,LTD,Xi’an 710018,China;China Northwest Architecture Design and Research Institute Co.,LTD,Xi’an 710018,China;Xi’an Branch,Vanke Enterprise Limited by Share Ltd.,Xi’an 710068,China)
出处
《建筑节能》
CAS
2020年第7期21-26,共6页
BUILDING ENERGY EFFICIENCY
关键词
U型地埋管
渗流
多孔介质
温度场
拉伸
U-type buried pipe
seepage
porous media
temperature field
stretch
