Influence on thermal response test by groundwater flow in vertical fractures in hard rock

被引:123
|
作者
Gehlin, SEA
Hellström, G
机构
[1] Swedish Assoc HVAC Engn, SE-11485 Stockholm, Sweden
[2] Lund Tech Univ, Dept Math Phys, SE-22100 Lund, Sweden
关键词
ground heat exchanger; borehole; groundwater; thermal response test; thermal conductivity;
D O I
10.1016/S0960-1481(03)00128-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a medium with an effective porosity is confronted and models for heat transfer due to groundwater flow in fractures and fracture zones are presented especially from a thermal response test point of view. The results indicate that groundwater flow in fractures even at relatively low specific flow rates may cause significantly enhanced heat transfer, although a continuum approach with the same basic assumptions would suggest otherwise. (C) 2003 Elsevier Science Ltd. All rights reserved.
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页码:2221 / 2238
页数:18
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