热渗耦合下地温场三维预测模型的开发与验证

发布时间：2018-05-01 00:28

  本文选题：地源热泵 + 地埋管换热器　； 参考：《化工学报》2016年S2期

【摘要】：垂直地埋管换热器周围地温场的变化对地源热泵的性能会产生重大影响。为长期准确高效地预测地温场,提出了一种耦合地源热泵系统COP的地温场三维模型,考虑空气边界、地下水渗流和土壤分层带来的影响。为降低计算负荷,将整个地埋管换热器简化为一维线热源。计算区域顶部设置第三类边界条件,以模拟土壤与空气的对流传热。采用交替方向隐式差分法离散非稳态能量方程,以提高计算稳定性。利用文献中的数据对模型进行验证,结果表明,所有温度预测值的绝对误差均小于±1.00℃,土壤内部测点温度尤其准确(均小于±0.20℃),最大误差出现在钻孔外壁。因此,模型能够准确快速地预测地温场的分布和地源热泵系统的性能。该模型尤其适用于地下水渗流复杂、存在明显土壤物性分层的地区。
[Abstract]:The variation of ground temperature field around vertical buried tube heat exchanger has great influence on the performance of ground source heat pump. In order to predict the ground temperature field accurately and efficiently for a long time, a 3D model of ground temperature field of coupled ground source heat pump system (COP) is presented, which takes into account the influence of air boundary, groundwater seepage and soil stratification. In order to reduce the calculation load, the whole buried tube heat exchanger is simplified to one dimensional line heat source. A third boundary condition is set at the top of the calculation area to simulate convective heat transfer between soil and air. The alternating direction implicit difference method is used to discretize the unsteady energy equation in order to improve the stability of the calculation. The results show that the absolute error of all temperature prediction values is less than 卤1.00 鈩，

本文编号：1826930