Abstract:

In order to determine the best well layout of groundwater source heat pump, to explore the variation characteristics of aquifer temperature field and the sensitivity of hydrogeological parameters. Based on the geothermal geological conditions and thermophysical parameters of the thermal reservoir, a three-dimensional water heat coupling numerical simulation model was constructed by using FEFLOW software in Xiaojiaying-Dongzhaotong groundwater source heat pump suitable area of Shijiazhuang. Under the pumping and irrigation capacity of 2 000 m3/d, the temperature field of aquifer with different well spacing, different well layout mode was simulated to explore the possibility of thermal breakthrough, and the sensitivity of thermal conductivity, permeability coefficient, porosity and other parameters of the temperature field were studied. The results showed that: 1) For the single pumping and double irrigation mode, Scheme C (the reinjection well was located at the downstream of the pumping well and the connecting line was perpendicular to the groundwater flow direction, and the two reinjection wells and the pumping well form an isosceles right triangle), the well layout scheme had the least impact on the temperature field of the aquifer and was the optimal scheme; 2) Under the single pumping and double irrigation mode, when the pumping and irrigation volume was 2 000 m3/d, the spacing of pumping and irrigation wells in Scheme C was set at 40-50 m, which was more reasonable; 3) In the process of pumping and irrigation, the temperature field was more sensitive to the change of permeability coefficient, but less sensitive to the change of porosity and thermal conductivity.

Key words: groundwater source heat pump')">

groundwater source heat pump, optimal layout of pumping and recharging wells, temperature field changes, parameter sensitivity,   ')">Shijiazhuang