| 引用本文: | 黄帅,朱科,董建锴,李骥,姜益强,方肇洪.中深层地埋管换热器取热稳定性及热影响半径[J].哈尔滨工业大学学报,2022,54(6):119.DOI:10.11918/202012089 |
| HUANG Shuai,ZHU Ke,DONG Jiankai,LI Ji,JIANG Yiqiang,FANG Zhaohong.Operation stability and heat-affected radius of medium-deep borehole heat exchanger[J].Journal of Harbin Institute of Technology,2022,54(6):119.DOI:10.11918/202012089 |
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| 中深层地埋管换热器取热稳定性及热影响半径 |
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黄帅1,2,朱科3,董建锴1,2,李骥4,姜益强1,2,方肇洪3
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(1.哈尔滨工业大学 建筑学院,哈尔滨 150006;2.寒地城乡人居环境科学与技术工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨 150090;3.山东建筑大学 热能工程学院,济南 250101;4.中国建筑科学研究院有限公司,北京 100101)
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| 摘要: |
| 为研究中深层地埋管换热器的取热稳定性及其热影响半径,建立了非稳态数值传热模型,基于有限差分法将控制方程离散求解,通过示范工程现场实测数据验证数值求解结果的正确性。在此基础上,研究长期运行下中深层套管式地埋管换热器的出水温度以及岩土的温度变化,并对影响中深层套管式地埋管换热器热扰的参数进行了敏感性分析。结果表明:经过15 a运行,中深层套管式地埋管换热器的出水温度较为稳定,从第11 a开始出水温度基本处于准稳态阶段,其周围核心取热区域的岩土最大温降比例仅为6.5%；随岩土热扩散率的增加,中深层地埋管换热器的热影响半径在前期增加速率较快,而后期较慢,当热扩散率a由1.43×10-6 m2/s增加到2.01×10-6 m2/s时,热影响半径r由82.69 m增加到99.23 m,增加率为20%,两者之间的关系呈指数规律变化,并且满足关系式r=-151.99×exp[-a/(5.14×10-7)]+98.14,其中R2=0.97。本研究对中深层地埋管换热器的设计具有一定的参考意义。 |
| 关键词: 中深层地热 地埋管换热器 数值模拟 参数分析 工程实测 |
| DOI：10.11918/202012089 |
| 分类号:TU833 |
| 文献标识码:A |
| 基金项目:黑龙江省自然科学基金优秀青年项目(YQ2019E024) |
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| Operation stability and heat-affected radius of medium-deep borehole heat exchanger |
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HUANG Shuai1,2,ZHU Ke3,DONG Jiankai1,2,LI Ji4,JIANG Yiqiang1,2,FANG Zhaohong3
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(1.School of Architecture, Harbin Institute of Technology, Harbin 150006, China; 2.Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090, China; 3.School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China; 4.China Academy of Building Research, Beijing 100101, China）
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| Abstract: |
| An unsteady numerical heat transfer model was proposed to study the operation stability and heat-affected radius of medium-deep borehole heat exchanger (MDBHE). The governing equations were discretized and solved based on the finite difference method (FDM). The numerical results were verified through the measured data of a project. On this basis, the outlet water temperature of MDBHE and the temperature of rock and soil under long-term operation were studied. The sensitivity analysis of the operating parameters affecting the thermal disturbance of MDBHE was also carried out. Results show that after operation of 15 years, the outlet temperature of MDBHE was relatively stable, and the outlet temperature of MDBHE was basically in a quasi-steady state from the 11th year, and the maximum temperature drop ratio of the surrounding rock and soil was only 6.5%. With the increase in the thermal diffusivity of rock and soil, the increase rate of heat-affected radius of MDBHE was faster in the early stage and slower in the later stage. When the thermal diffusivity a increased from 1.43×10-6 m2/s to 2.01×10-6 m2/s, the heat-affected radius r increased from 82.69 m to 99.23 m, with an increase rate of 20%. The relationship between them changed exponentially and satisfied the equation r=-151.99×exp[-a/(5.14×10-7)]+98.14, where R2=0.97. This research has certain reference significance for the design of MDBHE. |
| Key words: medium and deep geothermal energy deep borehole heat exchanger numerical simulation parameter analysis engineering measurement |
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