垂直地埋管地源热泵膨润土基钻孔回填材料导热特性研究

实验通过对膨润土基回填材料的配比、干密度、孔隙率、含水率和环境温度等因素研究发现,膨润土基回填材料的导热性能主要是由骨料(石英砂)含量、干密度和孔隙程度共同决定的,环境温度对回填材料导热性影响较小。含水率应合理控制,适宜配比、正确回灌能有效提高导热性和地下热交换器的工作效率,工程收益率高。

Experimental study on themal conductivity of bentomte backfill material ot geothermal neat exchanger

Make an experiment on the influence of composition,density,porosity, water content and temperature on the borehole backfill materials.The research results indicate that the thermal conductivity of bentonite backfill material is determined by the quartz sand content,density and porosity.The thermal conductivity with temperature is slightly higher,and water content should be reasonablely controlled.Suitable composition, correct backfill can effectively improve the thermal conductivity and the underground heat exchanger efficiency,and acquire an high project benefit.