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为确定地下水渗流对埋地换热器的影响,建立了考虑地下水渗流的三维有限长线热源模型,综合虚拟热源法、移动热源法和格林函数法得出了有渗流时半无限大介质中有限长线热源产生的非稳态温度响应的表达式。通过matlab编程模拟温度场,分析了单个钻孔周围土壤过余温度场。模拟结果发现:地下水渗流引起水平面上温度场的变形,当量渗流速度在10-6量级时,能有效缓解热堆积;沿钻孔不同深度处的土壤过余温度不同,在钻孔中部过余温度达到最大。该文中的三维模型可用来研究不同地区、不同土壤分层构造和分层地下水流速等复杂问题,从而更准确地预测分析实际工程运行后的地下温度场变化,具有重要意义,为进一步研究考虑土壤分层和地下水分层流动下地埋管周围温度场奠定了基础。
In order to determine the effect of groundwater seepage on the buried heat exchanger, a three-dimensional finite long-term heat source model considering groundwater seepage was established. Based on the virtual heat source method, mobile heat source method and Green’s function method, Expression of unsteady temperature response from heat source. By matlab programming temperature field simulation, analysis of a single hole around the soil excess temperature field. The simulation results show that the seepage flow of groundwater causes the deformation of the temperature field on the horizontal plane. When the equivalent seepage velocity is in the order of 10-6, the heat accumulation can be effectively alleviated. The excess soil temperature at different depths along the borehole is excessive in the borehole The temperature reaches its maximum. The three-dimensional model in this paper can be used to study complex problems such as stratigraphic structure and stratified groundwater flow rate in different regions, so as to predict and analyze the underground temperature field changes more accurately. This is of great significance. For further study, Stratification and groundwater flow under the ground around the buried pipe temperature field laid the foundation.