中深层地埋管换热器传热过程对周围岩土体的热影响
Thermal effect of heat transfer process of deep borehole heat exchangers on surrounding rock and soil
摘要：
利用传热数值计算模型，分析了不同取热工况下地埋管周围岩土体的温度响应及变化情况。给出了热影响半径的定义，研究了不同运行时间和取热负荷下单个钻孔和多个钻孔埋管对周围岩土体产生的热影响半径。结果表明，当钻孔深度为2 000 m时，1 750 m处的热影响半径最大；当采用3×3的钻孔布置形式时，建议钻孔间距大于100 m，名义取热量损失率小于5%。
Abstract：
Analyses the temperature response and variation of the rock and soil around the buried pipe under different heating conditions using a numerical heat transfer model. Proposes the definition of the thermal influence radius. Studies the thermal influence radii of single borehole and multiple-borehole buried pipes on the surrounding rock and soil at different running times and heating loads. The study shows that when the borehole depth is 2 000 m, the largest thermal influence radius occurs at the depth of 1 750 m. For the deep borehole heat exchangers with 3×3 boreholes, recommends over 100 m of the borehole spacing, and the nominal heat loss rate is less than 5%.
Keywords:deep borehole heat exchanger, coaxial heat exchanger, thermal influence radius, rock and soil, nominal heat