基于土壤分层当量物性的地埋管换热器换热模型研究

Research on heat transfer model of buried pipe heat exchanger based on equivalent physical properties of soil stratification

文章综合考虑了土壤分层与地下水渗流等情况,结合实测数据,通过地埋管外壁温度计算得出地埋管内部流体温度与不同分层土壤的热物性参数,根据土壤当量物性进行分层,据此建立地埋管换热模型。经过对比验证实验发现,分层换热模型比常规均质模型更接近实测值,误差更小;基于土壤分层当量物性的地埋管换热器换热模型模拟出水温度与实测值平均绝对误差为0.21℃,模拟进、出口换热温差与实测值平均绝对误差为0.14℃,具有较高的准确度,可为工程设计提供依据并作为后续地埋管换热优化研究的基础。

In this paper,considering the soil stratification and groundwater sepage,combined with the measured data,the fluid temperature inside the buried pipe and the thermophysical parameters of dfferent layered soils are obtained through the calculation of the outer wall temperature of the buried pipe,so as to establish the heat transfer model ofthe buried pipe stratified according to the equivalent physical properties of the soil.The experimental results show that the strati-fied heat transfer model is closer to the measured value than the conventional homogeneous model,and the error is smaller,The average absolute error between the simulated outlet water temperature and the measured value is 0.21℃,and the average absolute eror between the simulated inlet and outlet heat transfer'temperature difference and the measured value is 0.14℃ based on the equivalent physical properties of soil stratification,whichhas ahigh accuracy and can provide a basis for engineering design and serve as the basis for the subsequent optimization study of the bur-ied pipe heat transfer.