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设定桩基埋管换热器管内流态在紊流状态下,运用数值模拟研究不同流速条件下,并联双U型桩基埋管的单位桩长埋管换热量、进出口水温差、周围土壤平均温度、桩身平均温度和进出口压降的变化规律。提出“换热压降比”并分析计算,得出经济流速区间为0.25~0.3 m/s,为桩基埋管地源热泵系统设计以及运行提供依据。
Under the condition of turbulent flow, the numerical simulation was used to study the heat transfer, the temperature difference between the inlet and outlet water, the temperature difference between the inlet and the outlet of the double-U-shaped piles buried in the pipe under different flow rates, Soil average temperature, average temperature of pile and pressure drop of inlet and outlet. The paper puts forward “heat transfer pressure drop ratio” and analyzes and calculates that the economic flow rate interval is 0.25 ~ 0.3 m / s, which provides the basis for the design and operation of ground source heat pump system.