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以埋设在均匀渗流介质中的螺旋埋管为研究对象,结合地源热泵工程应用背景,将地下螺旋埋管简化为连续的螺旋线热源,通过移动线热源理论与格林函数法,建立二维和三维非稳态的导热与对流联合作用的渗流传热问题的传热模型;求得无限长及有限长螺旋热源形态下渗流问题的温度响应的解析解。通过与纯导热模型的对比可知,地下水渗流会在一定程度上影响地下温度场的分布及传热达到稳态所需的时间。指出渗流速度是体现地下水流动对换热过程影响程度的重要参数,且渗流对整个螺旋管群的换热影响也被分析讨论。
Based on the application background of ground source heat pump engineering, the underground spiral buried pipe is simplified as a continuous helical heat source. Based on the moving heat source theory and Green’s function method, a two-dimensional Heat transfer model of seepage heat transfer problem of three-dimensional unsteady thermal conductivity and convection; and analytical solution of temperature response of seepage problem under infinite and finite length helical heat source. Comparing with pure thermal model, groundwater seepage will affect the distribution of underground temperature field and the time required for heat transfer to reach steady state to a certain extent. It is pointed out that the seepage velocity is an important parameter that reflects the influence degree of groundwater flow on the heat transfer process, and the influence of seepage on the heat transfer of the entire coil group is also discussed.