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【英文篇名】 Numerical simulation on heat transfer characteristics of soil around compact pile-buried underground heat exchangers 【作者中文名】 赵军; 王华军; 【作者英文名】 By Zhao Jun★ and Wang Huajun ★Tianjin University; Tianjin; China; 【作者单位】 天津大学; 【文献出处】 暖通空调, Heating Ventilating 埋地换热器; 管群特性; 热屏障; 数值模拟; 【英文关键词】 ground source heat pump; underground heat exchanger; pipe-group behavior; heat barrier; numerical simulation; 【摘要】 以一实际地源热泵系统为例,在全年逐时负荷计算的基础上,对大面积密集型桩埋换热器管群周围土壤的换热特性进行了数值模拟。提出了土壤换热中热屏障的概念,并分析了热屏障的形成原因及其特性,即形状不规则、动态变化和危害性。长期运行中,热屏障带的温度增长速率要高于土壤平均温度的增长,建议从负荷平衡和热屏障两个角度进行分析,以保证地源热泵系统稳定可靠的运行。 【英文摘要】 With an actual ground source heat pump system example, based on the hourly calculation of annual cooling and heating load, carries out numerical simulation on heat transfer characteristics of the soil around compact pile-buried underground heat exchangers with large land area. Presents the concept of heat barrier, and analyses its formation and some characteristics including irregular shape, dynamic changes and potential harmfulness. For the long term operation, the growth rate of temperature is higher than...