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本文先介绍了单U与双U埋管换热性能研究现状,然后提出了将钻孔外与钻孔内分开、通过钻孔壁进行耦合研究的数学模型,最后通过某地源热泵工程作为实例对二者的夏季换热进行比较,得出单U埋管的单位井深换热能力低于双U埋管,但是其出口温度低于双U埋管;同时,双U埋管管壁处以及埋管周围土壤的温度均高于双U埋管。
In this paper, the research status of single U and double U tube heat exchangers is firstly introduced. Then a mathematical model is proposed to separate the borehole from the borehole through the borehole wall. Finally, a ground source heat pump project is taken as an example Comparing the summer heat exchange between the two, we find that the unit heat exchange capacity per unit of single U tube is lower than that of double U tube, but the outlet temperature is lower than that of double U tube. Meanwhile, Soil temperature around the buried pipe is higher than the double U buried pipe.