地下水源热泵系统和太阳能辅助热源系统的地温场数值模拟研究

Numerical Simulation Study on Geothermal Field of Ground Water Heat Pump System and Solar Assisted Heat Source System

摘要:

地下水源热泵系统的地温场数值模拟研究对浅层地热能开发利用项目具有重要意义。通过TOUGH2建立地下水源热泵系统的水-热耦合模型，模拟了研究区多年地温场变化趋势以及抽灌井温度变化。结果表明地下水源热泵系统运行10年后部分组团出现大量冷堆积现象，影响供暖温度。依据本结果，结合场地条件，针对冷堆积现象采用太阳能辅助热源系统进行系统强化设计，并模拟研究强化后的地温场多年变化趋势，结果表明太阳能辅助热源系统可以有效提高供暖温度。

Abstract:

Numerical simulation study on geothermal field of ground water heat pump system is of great significance to the development and utilization of shallow geothermal energy. By building hydro-thermal coupling model of ground water heat pump system by TOUGH2, the change trend of geothermal field and the temperature change of pumping-recharging wells in the study area for years are simulated. The results show that a large amount of cold accumulation appeared in some component parts of ground water heat pump system after 10 years’ operation, which affects heating temperature. Based on the above results and combined with the field site conditions, the solar assisted heat source system is adopted for the system strengthening design aiming at the cold accumulation, the change trend of geothermal field for years in the strengthened system is simulated, and the results show that the solar assisted heat source system can effectively improve the heating temperature.