A new solution for thermal interference of vertical U-tube ground heat exchanger for cold area in China

被引：27
|
作者：
Li, Xiao-Yan [1 ]
Li, Tian-Yang [1 ]
Qu, Dong-Qi [1 ]
Yu, Jia-Wen [1 ]
机构：
[1] Harbin Univ Commerce, Sch Energy & Bldg Engn, 1 Xuehai St, Harbin 150028, Heilongjiang, Peoples R China
来源：
GEOTHERMICS | 2017年 / 65卷
基金：
中国国家自然科学基金;
关键词：
Vertical U-tube ground heat exchanger; Pipe insulation; Operation mode; Thermal interference; PUMP SYSTEM; PERFORMANCE EVALUATION; COOLING PERFORMANCE;
D O I：
10.1016/j.geothermics.2016.08.002
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：
This paper presents a new solution to reduce the thermal interference of vertical U-tube ground heat exchanger (UGHE): pipe insulation installed on the upward branch pipe of the U-tube. 3-dimensional numerical models of the UGHE with and without pipe insulation were developed to simulate the heat transfer process around the UGHE. The models were verified with previously published data. The effects of pipe insulation on outlet temperature, soil temperature, heat exchange rate per unit length of borehole depth and soil temperature recovery ratio were investigated. The effects of inlet velocity of heat transfer fluid (HTF) and the thermal conductivity of backfill material were also studied to fully assess the effects of the insulation. The results indicate that the average outlet temperature of HTF, soil temperature near the upward branch pipe and soil temperature recovery ratio all increased and the thermal interference can be effectively weakened when pipe insulation was installed. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：72 / 80
页数：9
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