Influences of structure parameters on performance of tree-shaped ground heat exchanger

被引：2
|
作者：
Xu, Lingling [1 ]
Pu, Liang [1 ]
Qi, Di [1 ]
Li, Yanzhong [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Refrigerat & Cryogen Engn, Xian 710049, Shaanxi, Peoples R China
来源：
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS | 2019年 / 158卷
基金：
中国国家自然科学基金;
关键词：
thermal load imbalance; heat accumulation; tree-shaped GHE; structure parameters; comprehensive performance; CONSTRUCTAL-THEORY; OPTIMIZATION;
D O I：
10.1016/j.egypro.2019.01.526
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
During long-term operation of ground source heat pump (GSHP) system, heat accumulation is a common problem leading to the increase of soil temperature and the degradation of operating efficiency. The tree-shaped ground heat exchanger (GHE) showed great potential to eliminate heat accumulation and maintain soil temperature. In this paper, the influences of structure parameters on flow and heat transfer performance of GHE are explored. The results indicate that the diameter ratio adopting design method of minimum flow resistance has better comprehensive performance than that of minimum thermal resistance. For two sub-tubes, the comprehensive performance of GHE increases as the rise of asymmetry ratio and reaches maximum when the sub-tube is symmetric. Meanwhile, for tree shaped GHE with bifurcation level of 1, the optimal length ratio is 1. (C) 2019 The Authors. Published by Elsevier Ltd.
引用
收藏
页码：5954 / 5961
页数：8
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