寒区土壤源热泵带相变温度场数值模拟

Numerical Simulation on Phase Change Heat Transfer of Ground-Source Heat Pump System in Cold Region

根据传热学、渗流理论提出了寒区带相变问题土壤源热泵的数学模型及其控制方程,利用有限单元法对大庆油田某土壤源热泵冬季供暖工况下的传热问题进行了数值模拟和分析。通过与不考虑土壤冻结情况的结果对比,表明在热泵运行初期,由于冰水相变潜热的影响,土壤冻结锋面相对移动慢,土壤降低温度幅度小。随着冻结时间的增加,土壤温度分布逐渐稳定。土壤冻结时产生的相变潜热会影响土壤的传热效果。

According to heat transfer and filtration theory,mathematical model and its control equation of ground-source heat pump in cold climate were put forward. The in heating situation was simulated by using finite element method to ground-source heat pump heating of the Daqing oil field in winter. By comparison with and without consideration of soil freezing,the results show that the phase change latent heat could reflect the heat transfer effect. The soil freezing can increase thermal conductivity,which is beneficial to the heating effect and pump efficiency.