中深层U型井换热试验研究OA

In order to investigate the performance of the U-shaped well ground heat exchanger system and verify the feasibility of the U-shaped well ground heat exchange technology,a U-shaped well heat exchange test was established.The geological background of the test site area,including the strata,rock type,and ground temperature field data,was clarified.Open tests with different inlet water temperatures under constant flow rate and closed tests with different set heat extraction rates under constant flow rate were carried out to study the changes in the ground temperature field during the initial period,operation period,and recovery period.The fiber optic temperature measurement monitored the changes in the ground temperature field during the initial,operation,and recovery periods.The results showed that in the constant flow rate heat exchange test,the outlet water temperature was positively correlated with the inlet water temperature,and the heat exchange amount was negatively correlated with the inlet water temperature.In the constant temperature heat exchange test,the outlet water temperature was negatively correlated with the inlet water flow rate,and the heat exchange amount was positively correlated with the inlet water flow rate.The heat exchange process had a significant disturbance to the ground temperature field around the well,and the ground temperature field was affected by both the heat exchange method and the original ground temperature field during the heat exchange process.The research results can provide important references for the efficient development and utilization of geothermal resources and help optimize the design of ground heat exchanger systems.