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地下水源热泵井(ground source heat pump,简称GSHP)是一种新型的浅层能源利用技术。基于能量守恒方程和质量守恒方程,建立单井热泵系统的热传递方程、渗流方程、连续性方程以及THM(thermo-hydro-mechanical)耦合本构方程。通过COMSOL软件,对单井系统周围区域进行流动模拟,得到井体的整体热位移变形图和破坏准则图。研究结果表明,(1)水压力梯度随着井体半径的增加而变大,最终趋于一个稳定的值;(2)热传递模型的理论计算结果和工程现场的实测值具有较好的吻合性,证明该模型的合理性和有效性。
Ground source heat pump (GSHP) is a new type of shallow energy technology. Based on the energy conservation equation and mass conservation equation, the heat transfer equation, seepage equation, continuity equation and thermo-hydro-mechanical coupling constitutive equation of single-well heat pump system are established. Through the COMSOL software, the flow around the single well system is simulated and the overall thermal displacement deformation diagram and failure criterion diagram of the well body are obtained. The results show that (1) the water pressure gradient becomes larger with the increase of the radius of wellbore, and finally tends to a stable value. (2) The theoretical calculation results of heat transfer model are in good agreement with the measured values at the project site It proves the rationality and effectiveness of the model.