上海地区地源热泵单U型地埋管运行特性研究

Operating Performance of Single U-tube Buried Pipe of Ground-source Heat Pump in Shanghai

在上海地区建立单U型地埋管地源热泵实验台,分别在典型供冷供热工况下进行实验。实验主要分析了地源热泵运行时地埋管周围不同深度土壤温度变化情况,地埋管进出水温变化情况,地埋管单位井深换热量和地源热泵停机后地下不同深度土壤温度恢复情况。通过分析得出上海地区单U型地埋管换热器的运行特性。并采用GAMBIT建模软件和FLUENT数值计算软件,对单U型地埋管夏季出水温和冬夏季埋管周围土壤温度进行数值模拟,并将实验结果与模拟结果进行比较,二者有较高的吻合度,可为上海地区实际工程及后续研究提供参考依据。

AnexperimentalrigtostudytheoperatingperformanceofsingleU-tubegroundsource heat pump (GSHP) was developed in Shanghai area. The experiment was carried out under typical cooling and heating conditions. The soil temperature variations along the pipes in different depth, the water temperature variations at the inlet and outlet of the buried pipes, the heat exchange capacity per unit well depth when the GSHP running and the soil temperature recovery in different depth after shutdown the GSHP were reported . Based on the experimental results , the operating performance of single U-tube ground heat exchanger in Shanghai was analyzed. And GAMBIT software and FLUENT software were used to simulate the water temperature at the buried pipes outletin summer and the soil temperature around the buried pipes in summer and winter. The predicted temperatures agreed reasonably well with the experimental data. The results could be used to provide a reference for practical engineering and follow-up study.