回填材料对埋地换热器传热性能的影响研究  

Effects of Backfill Materials on the Heat Transfer Performance of Geothermal Heat Exchangers

作　　者：杜红普[1] 齐承英[1] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《河北工业大学学报》2010年第5期44-47,共4页Journal of Hebei University of Technology

基　　金："十一五"国家科技支撑计划重大项目(2006BAJ03A06-06);天津市科技支撑计划重点项目(07ZCKFSF00400)

摘　　要：在天津地区开展了3种不同回填材料的埋地换热器换热特性实验研究,获得了地下换热量随管内流体平均温度的实测变化曲线,并对该3种回填材料下的实验结果进行了比较分析.实验结果表明,地下换热量与流体平均温度之间呈线性变化规律.随着回填材料导热系数的增加,可以显著减小钻孔内的导热热阻,这有利于改善粘土质土壤与埋管换热器之间的传热性能,提高地源热泵系统运行的稳定性.The present work was performed to study the heat transfer performance of a geothermal heat exchanger（GHE） under the condition of different backfill materials at Tianjin areas.The variations of the heat transfer rate of the GHE with the average fluid temperature were obtained.Experimental results showed that there appeared a linear relationship.With the increasing thermal conductivity of backfill materials,the heat resistance inside the borehole was reduced greatly and the thermal performance of the GHE was improved noticeably,which could be helpful to guarantee the long-term operation stability of ground source heat pumps systems.

关 键 词：地源热泵 埋地换热器 回填材料 导热系数 传热性能 

分 类 号：TK523[动力工程及工程热物理—热能工程]