Effect of pumping well operation on borehole heat exchangers
Effect of pumping well operation on borehole heat exchangers
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DOI：
10.1016/j.geothermics.2022.102536
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发表时间：
2022-11
期刊：
影响因子：
3.9
通讯作者：
Shunsuke Tsuya;Hikari Fujii;H. Kosukegawa;Kanako Yamashita;Saeid Mohammadzadeh Bina
中科院分区：
文献类型：
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作者：
Shunsuke Tsuya;Hikari Fujii;H. Kosukegawa;Kanako Yamashita;Saeid Mohammadzadeh Bina
地下水的流动可以提高埋管换热器的换热效率。在这项研究中，我们评估了抽油井作业的性能上的埋管换热器进行加热操作测试和数值模拟的效果。在日本秋田市，使用安装在现有抽水威尔斯井附近的地源热泵系统进行了供暖试验。地源热泵系统的性能系数的增加，虽然地下水位显着下降的抽水威尔斯运行期间。接下来，使用FEFLOW软件版本7.1开发了抽水井、埋管换热器和周围地面的数值模型，并通过历史匹配使用在加热操作测试期间测量的水位和温度进行了验证。并通过实例分析了抽油井对埋管换热器的影响。实例研究表明，在强抽水过程中，抽水井显著提高了埋管换热器的性能。此外，较高的抽气率提高了埋管换热器的换热能力。最后，安装一个埋管换热器上游的抽水井在地面与自然地下水流的性能增强的埋管换热器。因此，估计在距离抽水井80 m半径范围内以250 L/min或更高的抽水速率安装埋管换热器可改善系统。
The heat exchange efficiency of borehole heat exchangers can be enhanced by the groundwater flow. In this study, we evaluated the effect of pumping well operations on the performance of a borehole heat exchanger by performing heating operation tests and numerical simulations. The heating test was conducted using a ground source heat pump system installed near existing pumping wells in Akita City, Japan. The coefficient of performance of the ground source heat pump system increased during operation of the pumping wells, although the level of groundwater notably dropped. Next, a numerical model of the pumping well, borehole heat exchanger, and surrounding ground was developed using FEFLOW software ver.7.1 and validated through history matching using the water level and temperature measured during the heating operation test. Case studies were also conducted to evaluate the effect of the pumping well on the borehole heat exchanger. The case studies showed that the pumping well significantly enhanced the performance of the borehole heat exchanger during intensive pumping. Additionally, a high pumping rate improved the heat exchange capacity of borehole heat exchanger. Finally, installation of a borehole heat exchanger upstream to a pumping well in the ground with natural groundwater flow enhanced the performance of the borehole heat exchanger. Therefore, installation of a borehole heat exchanger within a radius of 80 m from the pumping well with a pumping rate of 250 L/min or more was estimated to improve the system.