分层岩土体综合导热系数的加权平均估算方法

发布时间：2018-03-16 09:49

本文选题：地源热泵　切入点：综合导热系数　出处：《可再生能源》2017年12期 　论文类型：期刊论文

【摘要】：为了探究利用加权平均估算方法来评估分层岩土体综合导热系数的合理性,以及提高评估结果的准确性,文章基于不同岩土层导热系数在加权平均估算方法中的权重差异,提出了权系数改良方法,并通过实例对权系数改良前后的加权平均估算方法进行比较。研究结果表明:由于地埋管沿程换热特性的影响,岩土体分层导热系数对综合导热系数的影响权重沿深度方向近似呈现出线性减小的变化趋势;利用简单加权平均估算方法得到的岩土体综合导热系数与本文模拟结果之间的相对误差δ1不超过11.9%,并且利用该估算方法只能得到岩土体综合导热系数的大致范围;利用改良加权平均估算方法得到的岩土体综合导热系数与本文模拟结果之间的相对误差δ2低于δ1,且二者的最大差值为4%。综上可知,改良加权平均估算方法的估算结果更加准确。
[Abstract]:In order to explore the rationality of using weighted average estimation method to evaluate the comprehensive thermal conductivity of layered rock and soil mass, and to improve the accuracy of the evaluation results, the paper bases on the weight difference of the thermal conductivity of different rock and soil layers in the weighted average estimation method. The method of weight coefficient improvement is put forward, and the weighted average estimation method before and after the improvement of weight coefficient is compared by an example. The results show that the influence of the heat transfer characteristics of buried pipes along the course is the result of the comparison of the weighted average estimation method before and after the improvement of weight coefficient. The influence of stratified thermal conductivity of rock and soil on the comprehensive thermal conductivity the weight shows a linear decreasing trend along the depth direction. The relative error (未 _ 1) between the comprehensive thermal conductivity of rock and soil and the simulation results obtained by using the simple weighted average method is not more than 11.9. and the approximate range of the comprehensive thermal conductivity of rock and soil can only be obtained by using this method. The relative error between the comprehensive thermal conductivity of rock and soil and the simulated results of this paper is lower than 未 1, and the maximum difference between the two is 4. In summary, it can be seen that the estimation results of the modified weighted average method are more accurate.
【作者单位】：山东省地矿工程集团有限公司;天津大学机械工程学院中低温热能高效利用教育部重点实验室;
【基金】：国家自然科学基金项目(41672234)
【分类号】：TU83

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