【摘要】 将武汉地区某测试桩基地埋管(采用双U形管)换热器作为研究对象,采用多物理场求解软件COMSOL Multiphysics建立桩基地埋管换热器的三维数值模型。结合现场测试得到的循环水出水温度对模拟结果进行验证,结果表明,模拟结果与实测结果的相对误差在允许范围内,证明数值模型具有较好的可靠性。小流速条件下,桩基深度对单位深度桩基换热量的影响明显,随着流速增大桩基深度的影响逐渐减弱;达到一定流速后,单位深度桩基换热量的变化率很小。对于实际工程,应选取适宜的桩基深度、流体流速。更多还原

【Abstract】 Taking a test double U-type buried tube heat exchanger inside pile foundation in Wuhan area as the research object,the three-dimensional numerical model for buried tube heat exchanger inside pile foundation is established by multi-physics field solving software COMSOL Multiphysics. The circulating water outlet temperature measured in the field is used to verify the simulation results. The results show that the relative error between the simulated and measured results is within the allowable range,which proves that the numerical model has good reliability. Under the condition of small flow rate,pile foundation depth has significant effect on heat transfer quantity per unit depth of pile foundation. The influence of the pile foundation depth is gradually weakened with increasing the flow rate. After reaching a certain flow rate,the changing rate of heat transfer quantity per unit depth of pile foundation is very small. The appropriate pile foundation depth and flow rate for practical engineering should be selected.更多还原