Numerical simulation of Fluid-Rock coupling heat transfer in naturally fractured geothermal system
Numerical simulation of Fluid-Rock coupling heat transfer in naturally fractured geothermal system
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DOI：
10.1016/j.applthermaleng.2011.01.038
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发表时间：
2011-07
影响因子：
6.4
通讯作者：
A. Shaik;S. Rahman;N. Tran;T. Tran
中科院分区：
文献类型：
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作者：
A. Shaik;S. Rahman;N. Tran;T. Tran
估计天然裂隙地热系统的热量提取是一项具有挑战性的任务。前人在这一领域的大部分工作是在模拟裂隙地热系统的热提取时假定局部瞬时热平衡的。本文研究了岩石基质与循环流体之间的热传递对裂隙地热系统生产经济热水的作用。为此，开发了一种将流体流动与热传递相耦合的数值方法。这种方法的创新之处在于它在模拟岩石和循环流体之间的流体流动和换热时，动态处理了单个裂缝的特征属性(孔径、长度和方位)。文中选取了裂隙密度为0.05m−1的天然裂缝型地热系统进行了实例研究。这项研究的结果表明，岩石和流体之间的热传递和裂缝连通性对地热储的经济潜力有着深远的影响。
Estimating heat extraction from naturally fractured geothermal systems is a challenging task. Most of the previous works in this area assumed an instantaneous local thermal equilibrium while simulating heat extraction from the fractured geothermal systems. This paper investigates the role of heat transfer between the rock matrix and circulating fluid on economic hot water production from fractured geothermal systems. For this purpose a numerical procedure is developed by coupling fluid flow with heat transfer. The novelty of this approach lies in its dynamic treatment of the characteristic properties (aperture, length and orientation) of individual fractures in simulating fluid flow and heat transfer between rock and circulating fluid. A naturally fractured geothermal system with a medium fracture density of 0.05 m−1is chosen for a case study. The results of this study have shown that heat transfer between rock and fluid and fracture connectivity has a profound effect on the economic potential of a geothermal reservoir.