基于动态负荷的地埋管管群换热模型对比分析

发布时间：2018-07-03 17:36

本文选题：地埋管管群 + 动态负荷　；参考：《化工学报》2014年03期

【摘要】：对比分析了地埋管换热器的无限长线热源、有限长线热源和渗流有限长线热源模型,指出轴向传热和地下水渗流作用对地埋管换热具有不可忽略的影响;基于温度场叠加原理和动态负荷建立了地埋管管群换热模型,借助于典型年动态年负荷模型,分析了管群长期动态换热特性。结果表明,无渗流型管群中心温度升高过快,长期运行应考虑土壤换热能力的衰减;对于渗流型管群换热,应采取合理优化策略避免下游土壤温升过快,并且设计埋管时应采用其进入稳定期的换热能力,避免长期运行时换热能力不足。对3种日负荷动态运行模式下管群的典型点温度变化进行了对比分析,结果表明,运行模式调节可以减缓土壤温度的上升趋势,特别是可减少渗流型管群的下游热量堆积,有利于土壤换热能力的恢复。
[Abstract]:The infinite line heat source, the finite line heat source and the seepage finite line heat source model of the underground tube heat exchanger are compared and analyzed. It is pointed out that the axial heat transfer and the groundwater seepage effect on the underground tube heat transfer can not be ignored. Based on the principle of superposition of temperature field and dynamic load, the heat transfer model of buried pipe group is established. With the aid of typical annual dynamic annual load model, the long-term dynamic heat transfer characteristics of pipe group are analyzed. The results show that the central temperature of the non-seepage pipe group rises too fast, and the attenuation of soil heat transfer capacity should be considered in the long-term operation, and for the seepage type pipe group, reasonable optimization strategies should be adopted to avoid the excessive temperature rise in the downstream soil. In order to avoid the shortage of heat transfer capacity in long-term operation, the heat transfer capacity of buried pipe should be adopted when it enters the stable period. The variation of typical temperature of pipe group under three kinds of daily load dynamic operation modes is compared and analyzed. The results show that the adjustment of operation mode can slow down the rising trend of soil temperature, especially decrease the heat accumulation in the downstream of seepage pipe group. It is beneficial to the recovery of soil heat transfer capacity.
【作者单位】：解放军理工大学国防工程学院军事环境教研中心;
【基金】：防护工程地埋管换热器应用关键技术研究(参训兵2010429)~~
【分类号】：TU83

【参考文献】