Establishes an experiment platform on the basis of an existing U-tube ground-source heat pump system for hot water. Studies the startup characteristics and coefficient of heating performance of ground-source heat pump, temperature recovery of circulating water in buried pipe, heat transfer per unit borehole depth and thermal influence radius of ground heat exchanger under different operation conditions in this region. The results show that the period from starting the ground-source heat pump to stable heat transfer is 6 to 9 hours; the average of COP is 3. 47 and 3. 56 in continuous and intermittent conditions respectively; heat transfer per unit borehole depth in the two test wells in the intermittent operation condition is increased by 6.6% and 9.4% respectively compared to that in the continuous condition; the thermal influence radius of the two U-tube ground exchangers within 48 h is between 0.5 m and 1.0 m.%在现有的U形地埋管地源热泵热水系统的基础上搭建了实验平台,研究了该地区不同运行工况下地埋管地源热泵的启动运行特性、制热性能系数COP、地埋管内循环水温度恢复规律、单位井深换热量及地埋管换热器的热影响半径.结果显示,该地区地埋管地源热泵供热工况下从启动到进入稳定换热的时间为6～9 h,连续和间歇运行工况下COP的平均值分别为3.47和3.56,间歇运行工况下两个实验井的单位井深换热量比连续运行工况分别提高了6.6％和9.4％,两种U形地埋管换热器在48 h内的热影响半径均在0.5～1.0m之间.
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