Simulation of novel bionic tree-shaped ground heat exchanger to mitigate thermal short-circuiting

被引：0
|
作者：
Xu L. [1 ]
Pu L. [1 ,2 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷
关键词：
Bionic tree-shaped ground heat exchanger; CFD; Fractals; Numerical simulation; Thermal short-circuiting; Thermos-fluidic performance;
D O I：
10.11949/0438-1157.20201572
中图分类号：
学科分类号：
摘要：
The thermal short-circuiting problem between adjacent buried pipes is the key factor to restrain the efficient and sustainable operation of ground heat exchanger (GHE). In this paper, based on the constructal theory, a novel bionic tree-shaped GHE is proposed to solve the thermal short-circuiting problem and improve performance of GHE. The thermal performance and comprehensive performance of the bionic tree-shaped GHE were simulated by Fluent, and a comparison between the bionic tree-shaped GHE and serpentine GHE was conducted. The feasibility of the bionic tree-shaped GHE for solving the thermal interference problem of adjacent buried pipes and improving the system efficiency was analyzed. The results indicated that the new bionic tree-shaped GHE can effectively mitigate the thermal short-circuiting problem of adjacent buried pipe and avoid local heat accumulation. Meanwhile, the uniformity of soil temperature was improved. Furthermore, when the inlet velocity is in the range of 0.4—1.2 m/s, the comprehensive performance of bionic tree-shaped GHE is obviously better than that of serpentine GHE, with a value of 33.4%—38.3%. © 2021, Editorial Board of CIESC Journal. All right reserved.
引用
收藏
页码：134 / 139
页数：5
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