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摘要 采取数值计算与解析计算相结合的方法，在构建地埋管换热器与地上机组耦合模型的基础上，研究了夏季变热流边界条件下单U形地埋管换热器与地上机组耦合运行的非稳态特性。分析了连续运行工况和间歇运行工况下地源热泵机组COP、单位管长换热量、埋管进出口流体温度及钻孔壁面平均温度随运行时间的变化规律。 关键词 地源热泵 地埋管换热器 耦合运行 COP 单位管长换热量 温度 Heat transfer of ground heat exchanger for GSHP（4）：system characteristics in coupled operation By Yuan Yanping, Cao Xiaoling, Lei Bo and Zhang Dan Abstract By means of numerical simulation and analytical solution, studies the transient heat transfer characteristics of coupled operation of single U-type ground heat exchanger and the overground unit with variable heat flow boundary in summer based on a coupled model. Analyses the variety patterns of COP of GSHP unit, heat exchanger capacity per unit pipe length, inlet and outlet fluid temperature of buried pipe and averaged borehole wall temperature separately in continuous running and intermittent running. Keywords ground-source heat pump, ground heat exchanger, coupled operation, coefficient of performance, heat exchanger capacity per unit pipe length, temperature