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为了给直接膨胀式地埋管地源热泵U形铜管地埋管换热器的优化设计提供理论依据,利用自定义函数添加相界面质量和热量传递源项,建立了修正的两相流混合物模型,对地下换热系统供热工况下的三维流场和换热过程进行了数值模拟,分析了工质不同进口干度和流量对地埋管换热器内流体流动及换热性能的影响。结果表明,该模型符合工程精度要求;U形铜管内温升主要集中在距进口0~15m管段;在一定的质量流量条件下存在最佳干度,或者干度一定时存在最佳流量,使得换热性能最优。
In order to provide a theoretical basis for the optimization design of U-shaped copper tube ground tube heat exchangers for directly inflated ground-penetrating ground source heat pumps, a modified function of two-phase flow was established by adding a phase interface mass and a heat transfer source term using a custom function Model, the numerical simulation of the three-dimensional flow field and heat transfer process under the heat condition of the underground heat exchange system was carried out. The fluid flow and heat transfer performance of the heat exchanger with different inlet dryness and flow rate were analyzed influences. The results show that the model meets the requirements of engineering accuracy. The temperature rise in U-shaped copper pipes is mainly concentrated in the pipe section of 0 ~ 15m away from the inlet. Under the condition of certain mass flow, there exists the best dryness, Making the best heat transfer performance.