一种基于管群G函数的埋地换热器间距确定方法

建立了垂直U型埋地换热器管群G函数的理论计算模型,并基于Monte Carlo算法进行了数值求解.在此基础上,提出了一种直接确定埋地换热器间距的简化计算方法.该方法综合考虑了埋地换热器的长、短期换热性能,并可以推广至大规模管群布置条件.给出了上述方法的计算实例,并回归了一些典型U型埋地换热器结构布置条件下,管群G函数随无量纲运行时间的函数关系.

A Determination Method on Pipe Spacing between Geothermal Heat Exchangers Based on G-functions

A theoretical G-function model for vertical U-shaped geothermal heat exchangers(GHE)is presented,and based on Monte-Carlo algorithm,numerical simulation is carried out.A simplified calculation method of determining the pipe spacing between GHEs is developed,in which the short-term and long-term performance of GHEs are taken into full consideration, and this method can be applied to the situation with large-scale pipe groups. Besides,an example for practical application is given,and the variation of G-functions with the dimensionless operation time under the typical layout of U-shaped GHEs is simulated and regressed as available algorithms.