欢迎访问《太阳能学报》官方网站,今天是 分享到:
ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (4): 95-103.DOI: 10.19912/j.0254-0096.tynxb.2020-0897

• 电化学储能安全性与退役动力电池梯次利用关键技术专题 • 上一篇    下一篇

基于分段法的同轴套管换热器解析模型研究

黄献文, 姚直书, 薛维培, 蔡海兵, 刘小虎   

  1. 安徽理工大学土木建筑学院,淮南 232001
  • 收稿日期:2020-09-01 出版日期:2022-04-28 发布日期:2022-10-28
  • 通讯作者: 姚直书(1963—),男,硕士、教授,主要从事矿井支护及地热利用方面的研究。zsyao@aust.edu.cn.
  • 基金资助:
    国家自然科学基金(51674006; 51778004); 安徽省大学学科专业人才基金(gxbjZD09); 安徽省自然科学基金青年项目(1908085QE185)

ANALYTICAL MODEL OF COAXIAL BOREHOLE HEATEXCHANGER BASED ON SEGMENTATION METHOD

Huang Xianwen, Yao Zhishu, Xue Weipei, Cai Haibing, Liu Xiaohu   

  1. College of Civil Engineering and Architecture, Anhui Universit of Science and Technology, Huainan 232001, China
  • Received:2020-09-01 Online:2022-04-28 Published:2022-10-28

摘要: 为方便同轴套管换热器的优化设计,提出一种基于分段法的同轴套管换热器解析模型。在解析模型中,根据“热阻理论”和“线热源理论”分别构建钻孔内与钻孔外换热模型,并基于“分段法”和“时间迭加理论”组合构建准三维同轴套管换热器瞬态解析模型。将解析模型计算结果与试验结果、数值分析结果进行对比,验证解析模型的合理性。采用解析模型,研究土体导热系数非均匀分布对同轴套管换热效果的影响,结果表明:“均匀化”土体导热系数的同轴套管换热效率高于“梯度化”土体导热系数的同轴套管,且这种影响随单位深度上土体导热系数变化幅值的增加而增大;在同轴套管换热效率评估过程中应重视土体导热系数的非均匀特性。

关键词: 热泵系统, 换热器, 解析模型, 优化设计, 导热系数

Abstract: In order to optimize the design of Coaxial Borehole Heat Exchanger (CBHE), based on the segmentation method, an analytical model of the CBHE was proposed. In the analytical model, according to the "thermal resistance theory" and "line-source theory", the internal and external heat transfer models of the borehole were constructed respectively, and the 3D CBHE analytical model was constructed based on the " segmentation method" and "time superposition theory". The calculation results of the analytical model were compared with the numerical analysis results and test resnlts, which verified the rationality of the analytical model. Based on the analytical model, the influence of the non-uniform distribution of soil thermal conductivity on the heat transfer effect of CBHE is studied. The results show that the heat transfer efficiency for soil with homogenization thermal conductivity is higher than that of soil with gradient thermal conductivity, and this tendency increases with the increase of the thermal conductivity change amplitude; which means that the non-uniformity of soil thermal conductivity should be considered when evaluating the heat transfer efficiency of CBHE.

Key words: heat pump system, heat exchanger, analytical model, optimization design, thermal conductivity

中图分类号: