北京某垂直地埋管区地温场变化规律研究  

A study of ground temperature changes in a vertical heat exchanger area of Beijing

作　　者：刘爱华[1] 佟红兵[1] 冉伟彦[2] 

机构地区：[1]北京市地热研究院,北京102218 [2]北京市地质矿产勘查开发局,北京100195

出　　处：《水文地质工程地质》2016年第4期165-170,共6页Hydrogeology & Engineering Geology

摘　　要：为研究地埋管换热区地温垂向深度及平面展布特征,在室外分别布设了U型垂直地埋管和深度不等的观测孔,在典型深度安装了地温传感器,利用2期采暖及间歇期地温数据分析了地层背景温度、换热区及观测区地温变化。垂向上,在地埋管换热区内,恒温带以上地温受气温与埋管换热的综合影响;变温带地层各深度地温降幅与埋深呈正相关,最大换热深度120 m处降幅达5℃,原始地温是不同岩性地层温度降幅中较之岩土导热性及赋水性更为重要的影响因素。平面上,距地埋管5 m内的地温经取热后呈不同程度的降低,埋管换热监测区温降幅度约0.6℃,最大降幅并不固定于某一深度;距埋管距离越小,地温开始降低的时间越早,降低程度越大,且越难以恢复。In order to examine the ground temperature changes of a heat exchanger transfer area in Beijing at different vertical depths and planar distribution,U-tube and observation wells were constructed,and the temperature sensors were installed at the typical depths. The background formation temperature as well as the decreasing and recovering characteristics of temperature at the heat transfer and observation area were analyzed based on the data from the heat exchange and recover seasons. In the vertical direction,ground temperature change trend above constant temperature zone is combined with the influence of the air temperature and heat exchanger. The ground temperature reduction rate in the variable temperature zone is positivly related to the strata depth,and the temperature reduction is 5 ℃ at the deepest heat exchange depth of 120 m. The original ground temperature is a more important factor on temperature decline than the thermal conductivity and waterbearing capability of rock soil. In the plane distribution,ground temperature is diverse with the distance away from heat transfer within 5 m after the heating season. The induction in temperation is about 0. 6 ℃ in the observation area and the largest reduction rate is not fixed in the same depth. The temperature cannot recover to the initial geothermal level,and the shorter distance away from the heat transfer,the lager the decease in the range and the harder the recovery extent.

关 键 词：地源热泵 地埋管 地温场 换热区 

分 类 号：TK529[动力工程及工程热物理—热能工程]