综合智慧能源 ›› 2023, Vol. 45 ›› Issue (4): 81-88.doi: 10.3969/j.issn.2097-0706.2023.04.012

• 技术探索与展望 • 上一篇    

单井U型地埋管换热器传热特性与热渗耦合特性分析

刘媛媛1(), 耿直1,2,4,*(), 张元峰2, 张良3, 韩昭3, 张斌1   

  1. 1.华电郑州机械设计研究院有限公司,郑州 450046
    2.郑州航空工业管理学院 航空发动机学院,郑州 450046
    3.石家庄华电供热集团有限公司,石家庄 050041
    4.清华大学 能源与动力工程系,北京 100084
  • 收稿日期:2023-03-24 修回日期:2023-04-04 接受日期:2023-04-25 出版日期:2023-04-25 发布日期:2023-05-06
  • 通讯作者: 耿直
  • 作者简介:刘媛媛(1989),女,工程师,硕士,从事地热能利用、综合智慧能源系统研究,liuyuanyuan@chec.com.cn
  • 基金资助:
    中国华电集团科技项目(CHDKJ22-01-23);河南省青年人才托举工程计划项目(2022HYTP021);河南省住房城乡建设科技计划资助项目(HNJS-2022-K57);河南省土木建筑学会科技指导计划资助项目(202102)

Analysis of heat transfer characteristics and thermal-permeability coupling characteristics of single U-tube borehole heat exchangers

LIU Yuanyuan1(), GENG Zhi1,2,4,*(), ZHANG Yuanfeng2, ZHANG Liang3, HAN Zhao3, ZHANG Bin1   

  1. 1. Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450046, China
    2. School of Aero Engine, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
    3. Shijiazhuang Huadian Heating Supply Group Company Limited, Shijiazhuang 050041, China
    4. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
  • Received:2023-03-24 Revised:2023-04-04 Accepted:2023-04-25 Online:2023-04-25 Published:2023-05-06
  • Contact: GENG Zhi
  • Supported by:
    Science and Technology Program of China Huadian Corporation(CHDKJ22-01-23);Young Elite Scientists Sponsorship Program of Henan Province(2022HYTP021);Henan Housing and Urban-Rural Construction Science and Technology Plan(HNJS-2022-K57);Henan Civil Engineering and Architecture Society Supported Program(202102)

摘要:

在“双碳”目标下,浅层地热能供暖(冷)作为一种新型的清洁能源利用形式得到广泛使用。为提高浅层地热能的利用效率,以我国北方某综合能源供暖(冷)项目土壤源热泵系统为研究对象,构建单井U型地埋管换热器的三维非稳态传热模型,并利用Fluent软件分析其传热特性与热渗耦合特性。选取4.0,4.5,5.0 m等3个不同埋管间距和106.0,113.0,120.0 m等3种不同埋管深度,对地埋管换热器的换热总量及单位井深换热量分别进行对比分析。分析结果表明,埋管间距为 4.0 m、埋管深度为106.0 m时,单井地埋管换热器的换热效果最佳。对无渗流和有渗流及不同渗流速度下地埋管换热器温度场进行对比分析,结果表明,地下水渗流会对地埋管换热器换热效率带来正向影响,并且随着渗流速度的增加,换热效果更好。上述分析为实际工程的地埋管方案设计提供参考依据。

关键词: 地热能, 土壤源热泵, 地埋管换热器, 传热特性, 热渗耦合, 清洁能源, 双碳

Abstract:

To achieve the "dual carbon" target, shallow geothermal energy heating(cooling),a new utilization form of clean energy, has been widely applied. To improve the efficiency of geothermal energy, taking the ground source heat pump of an integrated energy heating(cooling) system in northern China as the research object, a 3D unsteady-state heat transfer model of a single U-tube borehole heat exchanger (BHE)was constructed, and its heat transfer characteristics and coupling characteristics thermal conduction and groundwater seepage were analyzed by the software Fluent. Comparative analyses on the total transfer heat and transfer heat per unit length were made on the BHE with three different spacing distances(4.0,4.5 and 5.0 m) and three different tube lengths(106.0,113.0 and 120.0 m),respectively. The analysis results show that the BHE with 4.0 m spacing distance and 106.0 m tube length demonstrates the optimal performance. Comparing the temperature fields of the BHE with and without seepage flow, the results show that seepage flow exerts positive effect on the BHE heat transfer efficiency, and the faster the seepage flows, the higher the heat transfer efficiency is. The analyses above provide references for the design of practical examples of BHE projects.

Key words: geothermal energy, ground-source heat pump, borehole heat exchanger, heat transfer characteristics, coupling of thermal conduction and groundwater seepage, clean energy, dual carbon

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