基于均匀设计的中深层U型地埋管取热潜力估算

Estimation of Heat Removal Potential of Medium-Deep U-shaped Buried Pipe Based on Uniform Design

为了对中深层U型井下换热系统的取热潜力进行估算,利用中深层U型地埋管换热模型编程进行了模拟验证,综合考虑土壤导热系数、竖直管长、地温梯度、水平管长、土壤密度与恒温层温度6个因素,采用均匀试验设计的方法设计了模拟试验方案,使用多元线性回归的方法对6个因素与取热量的关系进行了分析,建立了取热量的预测方程,结果表明,利用土壤导热系数、竖直管长、地温梯度、水平管长与恒温层温度5个因素即可对中深层U型地埋管换热器最大稳定换热量进行预测,最大稳定换热量预测值与模拟值的平均误差为6.76%,最大相对误差为-9.88%。

In order to estimate the heat extraction potential of the U-shaped underground heat exchange system in the middle and deep layers,a simulation verification was carried out using a U-shaped buried pipe heat exchange model programming in the middle and deep layers.Taking into account six factors including the soil thermal conductivity,vertical pipe length,ground temperature gradient,horizontal pipe length,soil density,and constant temperature layer temperature,a uniform experimental design method was used to design a simulation test plan.Multiple linear regression method was used to analyze the relationship between the six factors and the heat extraction,and a prediction equation for the heat extraction was established.The results shows that the maximum stable heat transfer of the U-shaped buried pipe heat exchanger in the middle and deep layers can be predicted using five factors including the soil thermal conductivity,vertical pipe length,ground temperature gradient,horizontal pipe length,and constant temperature layer temperature.The maximum stable heat transfer prediction value is obtained.The average error compared to the simulated value is 6.76%,and the maximum relative error is-9.88%.