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Numerical simulation of a novel spiral type ground heat exchanger for enhancing heat transfer performance of geothermal heat pump

机译：新型螺旋式地面热交换器提高地热热泵传热性能的数值模拟

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摘要

The spiral type one is more prominent of which the vertical type ground heat exchange (GHE) is the most common in ground source heat pumps (GSHP) and on the purpose of this study as well. The present paper provides numerical simulation for 1D-3D model of the ground source heat pumps in cooling mode by using COMSOL environment. In contrary to popular spiral models, this model is designed with a low depth and high diameter with special metal rods (Fins). The simulated spiral pipe has 10 m in depth and 1 m in diameter. In order to compensate the reduction in heat transfer due to the lower depth, the effect of different parameters such as velocity, pitch, thermal conductivity and specific heat capacity in backfill material and ground on the heat performance is investigated. Furthermore, different velocity range is recommended for several pitches. Also, as a novelty, an innovative design is modeled consisting of diverse type of horizontal aluminum rods (Fins) in the soil connected to the pipe completely (Finned pipe). The fins not only hold the pipe inside the ground firmly but also improve the heat transfer rate due to the area increase and the high thermal conductivity system up to 31%.
机译：在地面源热泵（GSHP）中，螺旋式一型最为显着，其中垂直式地面热交换（GHE）最常见，在本研究中也是如此。本文利用COMSOL环境对冷却模式下的地源热泵的1D-3D模型进行了数值模拟。与流行的螺旋模型相反，该模型设计有低深度和大直径，并带有特殊的金属杆（Fins）。模拟螺旋管的深度为10 m，直径为1 m。为了补偿由于较低深度而导致的传热减少，研究了回填材料和地面中不同参数（例如速度，螺距，导热系数和比热容）对热性能的影响。此外，对于多个螺距，建议使用不同的速度范围。另外，作为一种新颖性，对创新设计进行了建模，其中包括完全连接到管道（有鳍管）的土壤中的各种类型的水平铝棒（鳍）。散热片不仅将管牢固地固定在地下，而且由于面积增加和高达31％的高导热系统而提高了传热率。

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