钻孔
热交换器
线源
热扩散率
热导率
热的
地温梯度
环境科学
萃取(化学)
羽流
石油工程
岩土工程
地质学
工程类
机械工程
气象学
材料科学
地球物理学
地理
量子力学
物理
色谱法
复合材料
化学
声学
作者
Wanlong Cai,Fenghao Wang,Chaofan Chen,Shuang Chen,Jùn Líu,Zhiyuan Ren,Haibing Shao
出处
期刊:Energy
[Elsevier]
日期:2022-02-01
卷期号:241: 122937-122937
被引量:18
标识
DOI:10.1016/j.energy.2021.122937
摘要
To meet the prospect of carbon neutrality, Deep borehole heat exchanger (DBHE) shows good potentiality in extracting deep geothermal energy for building heating, especially in densely populated urban areas of northern China. To investigate the influence on different soil thermal properties and system layouts of the DBHE array, a comprehensive numerical model has been established by OpenGeoSys software coupled TESPy toolkit and a series of scenarios are simulated. Results show that thermal conductivity lay a more important influence on heat extraction performance for DBHE array, rather than volumetric heat capacity. The thermal plume of DBHE array will grow larger along with higher thermal diffusivity. For typical geological parameters in Xi'an, the inter-borehole spacing should not be set below 15 m or it will bring a risk of freeze in circulation. The heat extraction performance and long-term sustainability of single-line layout are obviously better than other layout patterns, also with a smaller ground area needed to deploy the boreholes. This study implies that soil thermal conductivity is the core factor in determining the heat extraction performance of DBHE array and also gives suggestions for the system design of DBHE array in the aspect of borehole spacing and system arrangement.
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