流体机械2016，Vol.44Issue(12)：75-82,8.DOI:10.3969/j.issn.1005-0329.2016.12.016
基于不平衡系数对地埋管热短路的评价与分析
Research of Thermal Short-circuiting and its Influence on Vertical Single U-shape Ground Heat Exchangers
摘要
Abstract
This paper uses the Fluent software to establish a 3-D equivalent rectangular numerical for vertical U-shape borehole heat exchangers ( BHEs) . And the result is verified by the thermal response test. Introduce thermal short-circuiting unbalance co-efficient as the evaluation index of the strength of thermal short-circuiting. The influence on coefficient of thermal conductivity of Backfill material,depth of buried pipes,velocity in pipe,and system operation mode were analyzed. The result shows that,backfill material coefficient of thermal conductivity and the buried depth of pipe is proportional to thermal short-circuiting unbalance coef-ficient. The velocity in pipe is inversely proportional to thermal short-circuiting unbalance coefficient,and it is the biggest effect and strength of thermal short-circuiting phenomenon. Intermittent operation can improve the system efficiency of heat exchanging, but not because of easing thermal short-circuiting phenomenon.关键词
地源热泵/热响应试验/热短路现象/数值模拟Key words
ground source heat pump/thermal response test/thermal short-circuiting phenomenon/the numerical simulation分类
机械制造引用本文复制引用
金光,张枭然,吴晅,田瑞,毕文明,王正文..基于不平衡系数对地埋管热短路的评价与分析[J].流体机械,2016,44(12):75-82,8.基金项目
内蒙古自治区自然科学基金资助项目(2014MS0530) （2014MS0530）
内蒙古自治区自然科学基金资助项目(2015MS0561) （2015MS0561）
