高性能地埋管换热器钻孔回填材料的实验研究  

Experimental research on high-performance backfill materials for ground heat exchangers

作　　者：陈卫翠[1] 刘巧玲[1] 贾立群[1] 孙亮亮[1] 方肇洪[1] 

机构地区：[1]山东建筑大学

出　　处：《暖通空调》2006年第9期1-6,23,共7页Heating Ventilating & Air Conditioning

基　　金：国家自然科学基金资助项目(编号:50476040)

摘　　要：通过实验研究了基于水泥、石英砂的回填材料各组分对材料导热系数、稠度、强度及膨胀率等的影响,优选出三种具有良好特性的水泥砂浆回填材料,其导热系数可达2.18～2.34W/(m·K)。通过对一个工程实例的模拟计算得出,与传统的膨润土回填材料相比,采用这些高性能回填材料能够减少地埋管换热器埋管长度29%～36%,可显著节省地埋管换热器的初投资和降低运行能耗。Experimentally studies the influences of each component on the thermal conductivity, consistency, strength and expansion ratio of cement-quartz sand grout backfill materials. Recommends three high-performance grout materials with thermal conductivity of 2.18 to 2.34 W/（m · K）. A case study shows that application of these cement-sand grout materials can reduce the buried pipe by 29% to 36% in length and the initial investment of ground heat exchangers and running energy consumption significantly compared with conventional bentonite grout.

关 键 词：地埋管换热器 水泥砂浆 回填材料 导热系数 埋管长度 

分 类 号：TU832.23[建筑科学—供热、供燃气、通风及空调工程]