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Thermally Affected Zone (TAZ) Assessment in Open-Loop Low-Enthalpy Groundwater Heat Pump Systems (GWHPs): Potential of Analytical Solutions
Geofluids ( IF 1.7 ) Pub Date : 2020-04-27 , DOI: 10.1155/2020/2640917
Martina Gizzi 1 , Glenda Taddia 1 , Elena Cerino Abdin 1 , Stefano Lo Russo 1
Affiliation  

Thermal perturbation produced in the subsurface by open-loop groundwater heat pump systems (GWHPs) must be predicted and constantly controlled, especially in the shallow aquifers of more densely urbanized areas, in order to guarantee plants’ long-term sustainable use and to avoid adverse effects on adjacent geothermal systems. Transient conditions in the flow dynamic can be successfully modelled by means of numerical modelling tools. However, for small plants in suitable hydrogeological systems, an alternative tool for predicting the thermally affected zone (TAZ) around the injection well can be found in analytical solutions for steady advective transport in a shallow aquifer. The validity of using steady analytical solutions to predict the TAZ development at the end of two different cooling seasons (2010 and 2016) was tested in the Politecnico di Torino GWHP system (NW Italy). When fixing the constant thermal difference ( ) between the injection and abstraction wells at 5°C, results revealed that a rather reliable assessment of the TAZ of Politecnico di Torino GWHPs, in Turin shallow aquifer, can be performed by plotting the cumulative distribution function of the injected discharge rate ( ) and setting 63% as a steady value.

中文翻译:

开环低焓地下水热泵系统 (GWHP) 中的热影响区 (TAZ) 评估:分析解决方案的潜力

必须预测和持续控制开环地下水热泵系统 (GWHP) 在地下产生的热扰动,尤其是在城市化人口密集地区的浅层含水层,以保证植物的长期可持续利用并避免不利的影响。对邻近地热系统的影响。流动动力学中的瞬态条件可以通过数值建模工具成功建模。然而,对于合适的水文地质系统中的小型工厂,可以在浅层含水层中稳定对流传输的分析解决方案中找到一种用于预测注入井周围热影响区 (TAZ) 的替代工具。在 Politecnico di Torino GWHP 系统(意大利西北部)中测试了使用稳定解析解来预测两个不同冷却季节(2010 年和 2016 年)结束时 TAZ 发展的有效性。当将注入井和抽取井之间的恒定热差 ( ) 固定在 5°C 时,结果表明,可以通过绘制都灵浅层含水层的 Politecnico di Torino GWHP 的 TAZ 进行相当可靠的评估。注入放电率 ( ) 并将 63% 设为稳定值。
更新日期:2020-04-27
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