不同类型地埋管钻孔换热能力对比分析

Comparative analysis on heat exchange capacity for different buried pipe boreholes

为完成浅层地热能调查项目,进一步推广其开发利用,天津市建立了土壤源地源热泵试验基地,开凿了80m、120m垂直钻孔以及120m的斜钻孔,回填不同类型的材料,并使用地层热物性测试仪进行现场热响应试验。本文通过对比分析各地埋管钻孔的换热能力,得出深度120m、垂直、双U型以原浆加中粗砂作为回填材料的地埋管钻孔换热效率最高,并对地埋管斜钻孔的合理利用提出建议,为以后的土壤源热泵工程设计提供经验。

In order to complete the shallow geothermal energy survey, and further promote its utilization and development, the ground-source heat pump testing base has been built in Tianjin. The vertical boreholes with the depth of 80m and 120m and the inclined borehole with the depth of 120m are drilled, which are backfilled with different types of materials. The field thermal response tests are carried out by using the stratum thermal property tester. The heat exchange capacity among different pipe exchanger boreholes are compared and it is indicated that the highest efficient pipe borehole is at the depth of 120m, vertical, double-U, and taking the original soil and coarse sand as the backfill material, and the reasonable use of inclined boreholes is suggested to provide the experience for the engineering design of the ground-source heat pumps.