岩溶含水层地下水源热泵运行对地下水温度场的影响
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摘要
为探究岩溶含水层水源热泵运行期间地下水温度场变化规律,以武汉市某场地地下水源热泵系统为例,基于有限元数值模拟软件FEFLOW,分别模拟了水源热泵空调制冷和制热期间抽水-回灌目的含水层中的渗流场和温度场,并对表征岩溶发育的重要参数储水系数和孔隙度进行敏感性分析。模拟结果表明,地下水源热泵运行仅影响回灌井附近地下水温度,不会对区域含水层温度产生影响;而表征岩溶发育的典型参数储水率和孔隙度,对模拟结果的影响不大。
In order to explore the characteristics of temperature field in karst aquifer during the groundwater source heat pump running,a certain site in Wuhan was taken as an example.Groundwater flow and temperature field in the pumping-injection target aquifer were modeled during the refrigeration and heating period respectively,using the finite element numerical simulation software FEFLOW.Sensitivity analysis of water storage coefficient and porosity,which were two important parameters to characterize karst development,was conducted in the present study.The simulation results show that the groundwater source heat pump operation only affected the groundwater temperature near the injection well and did not affect the regional aquifer temperature.The water storage coefficient and porosity of the karst aquifer had little impact on the simulation results.
In order to explore the characteristics of temperature field in karst aquifer during the groundwater source heat pump running,a certain site in Wuhan was taken as an example.Groundwater flow and temperature field in the pumping-injection target aquifer were modeled during the refrigeration and heating period respectively,using the finite element numerical simulation software FEFLOW.Sensitivity analysis of water storage coefficient and porosity,which were two important parameters to characterize karst development,was conducted in the present study.The simulation results show that the groundwater source heat pump operation only affected the groundwater temperature near the injection well and did not affect the regional aquifer temperature.The water storage coefficient and porosity of the karst aquifer had little impact on the simulation results.
引文
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[10]Lo Russo S,Civita M V.Open-loop GroundwaterHeat Pumps Development for Large Buildings:ACase Study[J].Geothermics,2009,38(3):335-345.
[2] 张淑秘,高青.地下水源热泵不同布井模式下地下温度场变化模拟分析[J].水电能源科学,2013,31(8):149-151.
[3] 赖光东,从辉,周维博,等.常温注水井对含水层热贯通的影响机理分析[J].水电能源科学,2018,36(6):137-140,186.
[4] Lo Russo S,Taddia G,Cerino Abdin E.Modeling theEffects of the Variability of Temperature-relatedDynamic Viscosity on the Thermal-affected Zone ofGroundwater Heat-pump Systems[J].HydrogeologyJournal,2018,26(4):1 239-1 247.
[5] Park B,Lee B,Lee K.Experimental Investigation ofthe Thermal Dispersion Coefficient under ForcedGroundwater Flow for Designing an OptimalGroundwater Heat Pump(GWHP)System[J].Jour-nal of Hydrology,2018,562:385-396.
[6] 杨武成,陈赫,李国正.地下水源热泵采能区水热耦合模型研究[J].水电能源科学,2012,30(12):139-142.
[7] Diersch H J G.FEFLOW-Finite Element Modelingof Flow,Mass and Heat Transport in Porous andFractured Media[M].Berlin Heidelberg:Springer-Verlag,2014.
[8] Kang F,Jin M,Qin P.Sustainable Yield of a KarstAquifer System:A Case Study of Jinan Springs inNorthern China[J].Hydrogeology Journal,2011,19(19):851-863.
[9] 刘佑荣,唐辉明.岩土力学[M].武汉:中国地质大学出版社,1999.
[10]Lo Russo S,Civita M V.Open-loop GroundwaterHeat Pumps Development for Large Buildings:ACase Study[J].Geothermics,2009,38(3):335-345.