Thermal response testing of a fractured hard rock aquifer with and without induced groundwater flow

被引:14
|
作者
Liebel, Heiko T. [1 ]
Huber, Kilian [2 ]
Frengstad, Bjorn S. [3 ]
Ramstad, Randi K. [4 ]
Brattli, Bjorge [1 ]
机构
[1] NTNU, Dept Geol & Mineral Resources Engn, N-7491 Trondheim, Norway
[2] Univ Bayreuth, Dept Geol, D-95440 Bayreuth, Germany
[3] Geol Survey Norway NGU, N-7491 Trondheim, Norway
[4] Asplan Viak AS, N-7490 Trondheim, Norway
关键词
Borehole heat exchanger; Fractured aquifer; Groundwater; Norway; Temperature profile; Thermal response test; HEAT-EXCHANGER; PERFORMANCE; TRANSPORT;
D O I
10.1007/s10064-012-0422-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study quantifies experimentally the influence of groundwater on the thermal conductivity measurements via thermal response tests (TRT) in a fractured hard rock with low matrix permeability. An artificial groundwater flow towards a nearby well was induced by groundwater extraction and a TRT performed simultaneously. The results were compared with a TRT performed 24 days later in the same well without groundwater extraction. The effect of the groundwater flow is shown indirectly by the enhanced effective thermal conductivity and directly through the comparison of temperature profiles before and 4 h after both TRTs. Simulations in FEFLOW show that a groundwater flow velocity of 130-1,300 m d(-1) through one open horizontal fracture of small volume increases the effective thermal conductivity by 11 % in the studied system.
引用
收藏
页码:435 / 445
页数:11
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