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首页> 外文期刊>JP journal of heat and mass transfer >NUMERICAL STUDY ON THE HEAT TRANSFER CHARACTERISTICS ACCORDING TO VARIOUS HEAT TUBE SHAPES OF VERTICAL CLOSED-LOOP GEOTHERMAL HEAT EXCHANGER
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NUMERICAL STUDY ON THE HEAT TRANSFER CHARACTERISTICS ACCORDING TO VARIOUS HEAT TUBE SHAPES OF VERTICAL CLOSED-LOOP GEOTHERMAL HEAT EXCHANGER

机译：垂直闭环地热交换器各种热管形状的传热特性的数值研究

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摘要

We conduct work on the branch tube type, concentric tube type, and spline type underground heat exchanger in addition to the single U-tube type, which is the heat pipe type mainly used in the vertical closed type earth heat exchanger. Difference due to the geometrical effect was shown according to each heat pipe shape. In the case of a branch tube type, geothermal heat exchanger disperses the flow path and enlarges the heat transfer surface area, the outflow region is widely distributed in the radial direction of the borehole, and the heat transfer is strong. On the contrary, in the case of the concentric tube type and spline type, subsea heat exchanger made up of one tube and easy to install, the distance from the wall surface of the borehole where the heat transfer takes place is too far, and the heat transfer rate is relatively small. Especially, in the case of the spline type geothermal heat exchanger, the pressure drop is largely caused by the geometric characteristics of the flow field in the outflow region, and it is judged that the efficiency is low as compared with the same pump head.
机译：除了单管型外，我们还在分支管式，同心管型和花键式地下热交换器上进行工作，该热管型主要用于垂直封闭式地球热交换器。根据每个热管形状显示由于几何效果引起的差异。在分支管式的情况下，地热换热器分散流动路径并扩大传热表面积，流出区域在钻孔的径向上广泛地分布，并且传热强度。相反，在同心管式和花键式的情况下，海底热交换器由一个管组成，易于安装，距离钻孔的壁表面的距离发生在太远的地方太远了，而且传热速率相对较小。特别地，在样条型地热交换器的情况下，压降基本上由流出区域中的流场的几何特性引起，并且与相同的泵头相比，判断效率低。

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