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针对地源热泵系统运行时出现的地埋管周围冷热量堆积的问题,提出了在地埋管管群两侧加抽水井和回灌井来产生人工流场,从而强化地埋管管群换热效果的方法.通过FEFLOW软件模拟了人工流场影响下地埋管的换热,对单个地埋管的换热进行了单因素敏感性分析,模拟了水井数量以及流场切换时间对地埋管管群换热效果的影响.结果表明:在选定工况下,加入人工流场后地埋管的换热量较无流场时均有较大提高,其中单个地埋管在流场定期切换与不切换情况下的换热量可较无流场时分别提高54.06%,和69.67%,;设置有1组水井、2组水井、3组水井的地埋管管群的平均换热量与无人工流场时相比分别提高了9.89%,、21.54%,和33.00%,;人工流场的切换时间越长,地埋管管群的换热效果越好,但随着切换时间的增长,平均换热量提高的幅度减小.
Aiming at the problem of accumulation of heat and heat around buried pipe in the operation of ground-source heat pump system, it is proposed to add artificial wells and pumping wells to both sides of buried pipe group so as to strengthen the buried pipe group The heat transfer effect was simulated by FEFLOW software.The heat transfer of single buried pipe was analyzed by single factor sensitivity and the influence of the number of wells and the time of flow field switching on the heat transfer of buried pipe The results show that under the selected conditions, the heat transfer of buried pipe after artificial flow field increases greatly compared with that of non-flow field, and the single buried pipe in flow field The heat exchange capacity under regular and non-switched conditions can be increased by 54.06% and 69.67% respectively compared with no flow field. The average heat transfer of buried pipe groups with one set of wells, two sets of wells and three sets of wells And 9.8%, 21.54%, and 33.00% respectively when compared with those without artificial flow field. The longer the manual flow field switching time, the better the heat exchange efficiency of buried pipe group, but with the switching time Growth, the average increase in heat exchange rate decreases.