内蒙地区垂直地埋管蓄热过程土壤温度的变化特性

给出了内蒙地区土壤温度计算式,通过计算获得该地区地表以下20m处土壤温度年波动范围为0.0483%。本文针对土壤蓄热过程建立了二维非稳态传热物理数学模型。基于有限元分析法对内蒙地区热泵长期(90天)连续蓄热过程进行了模拟研究。分析了钻孔口径、回填材料、地埋管管径及热流密度等因素对蓄热过程土壤温度特性的影响。研究表明:热泵长期连续运行会导致地埋管附近土壤出现热堆积不利于蓄热。热流密度、地埋管管径对土壤温度场和热作用半径影响较大;钻孔口径、回填材料对其影响较小;钻孔间距应保持在6.5m以上。研究结果对内蒙地区太阳能-地源热泵系统相关参数的设计具有重要指导意义。

Vertically Buried Pipe Process of Thermal Storage Soil Temperature Variation Characteristics in Inner Mongolia Region

The soil thermometer formula in Inner Mongolia region was obtained,then through it the surface soil temperature year range of 0. 0483% in the area of 20 meters below the surface was got. This article aiming at soil thermal storage process established physical and mathematical models of a two-dimensional unsteady heat transfer. Based on the finite element analysis method in Inner Mongolia region heat pump long-term( 90 days) continuous heat storage conditions have been numerical simulation study. This study analyzed the diameter of drilling,backfill materials,pipe size of buried pipe and heat flux factors influence of the temperature characteristics of soil heat storage process. The study showed that heat pump continuous run could lead to hot spot model stack near the tube and against heat storage. The process of soil temperature field and thermal influencing radius of great influence were pipe size of U-tube and heat flux and diameter of drilling and backfill material had little influence. The distance between the drilling and drilling should be keep in 6. 5m at least. The study results for Inner Mongolia region solar-ground source heat pump system and the design of related parameters have important guiding significance.