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在理论推导热作用半径的基础上,对单U型地埋管换热器进行数值模拟与数据分析,结果表明不同运行方式、不同进口水温对热作用半径的影响并不显著。基于热作用半径理论,研究了地埋管换热器的储热特性,包括平均储热密度和储热密度分布,得出间歇运行能够增强土壤的储热潜力。土壤平均储热密度随进口水温的提高而近似线性增大。U型管累计散热量相同时,连续运行的地埋管周围土壤在近壁端储热密度均大于在间歇运行情况下的储热密度,远端则相反。
Based on the theoretical derivation of the radius of thermal effect, the numerical simulation and data analysis of a single U - tube heat exchanger were carried out. The results show that the influence of different operating modes and inlet water temperature on the thermal radius is not significant. Based on the theory of thermal action radius, the heat storage characteristics of ground tube heat exchangers, including the average heat storage density and heat storage density distribution, are studied. It is concluded that intermittent operation can enhance the heat storage potential of the soil. The average soil heat storage density increases linearly with the increase of inlet water temperature. U-tube cumulative heat dissipation is the same, continuous operation of the soil around the buried pipe wall near the end of the heat storage density is greater than in the intermittent operation of the heat storage density, the opposite is the far end.