基于水平等尺度物理模型试验的地埋管换热性能关键影响因素  

Key influencing factors and mechanisms of heat transfer performance of buried pipe heat exchangers based on isoscale physical model tests

作　　者：王春磊 张佳乐 李玉山 何剑波 谭松成[7] 骆进[7] WANG Chunlei;ZHANG Jiale;LI Yushan;HE Jianbo;TAN Songcheng;LUO Jin(Key Laboratory of Groundwater Engineering and Geothermal Resources in Gansu Province,Lanzhou 730050,China;Hydrogeological Engineering Geological Survey Institute of Gansu Provincial Geological and Mineral Exploration and Development Bureau,Zhangye 734000,China;Tianjin Center,China Geological Survey(North China Center of Geoscience Innovation),Tianjin 300170,China;Xiong’an Urban Geological Research Center,China Geological Survey,Tianjin 300170,China;PowerChinaChengdu Engineering Corporation Limited,Chengdu 610072,China;Gansu Provincial Geological Environment Monitoring Institute,Lanzhou 730050,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]甘肃省地下水工程及地热资源重点实验室,甘肃兰州730050 [2]甘肃省地质矿产勘查开发局水文地质工程地质勘察院,甘肃张掖734000 [3]中国地质调查局天津地质调查中心(华北地质科技创新中心),天津300170 [4]中国地质调查局雄安城市地质研究中心,天津300170 [5]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [6]甘肃省地质环境监测院,甘肃兰州730050 [7]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2025年第2期196-205,共10页Safety and Environmental Engineering

基　　金：甘肃省自然资源厅科技创新项目(202232);甘肃省2023年度省级基础地质调查项目(202330);湖北省自然科学基金联合基金项目(2023AED197);中国地质大学(武汉)2024实验技术研究项目(SJ-202406)。

摘　　要：地埋管换热性能受多种因素影响,但由于现场测试难度大、耗时长和费用较高,前人大多仅针对单一因素展开研究,缺乏对其关键因素的系统了解。提出了一种水平等尺度模型平台,该平台可多次重复测试不同影响因素对地埋管换热效果的影响,在验证了水平等尺度模型可靠性的基础上,测试了三进一出型和单U型地埋管的换热效率,并进一步测试了管间距对其换热性能的影响,最后通过数值模拟分析了影响地埋管换热效率的机制。结果表明:在1.0和2.0 kW 2种功率下,与单U型地埋管相比,三进一出型地埋管的钻孔热阻分别降低了10.2%和35.9%,平均能效系数分别提高了3.4%和28.8%;当三进一出型埋管间距由60 mm增加至120 mm时,钻孔热阻降低了28.7%;管壁厚度的增大导致地埋管出口水温呈线性升高,管壁热阻也呈线性增大;扩大管间距时,出口流体温度和钻孔中心点处温度降低,这说明扩大管间距可以充分降低管间热干扰,达到提升换热效率的目的。因此,三进一出型地埋管充分利用了减薄进水管壁以减少热阻、增加出水管壁厚度以减少热损失的特点,且通过多管增大换热面积、增加管间距、减少管间热干扰等综合措施,显著提升了地埋管的整体换热效率。研究成果可为地埋管换热性能分析提供重要的实践手段,并为提升地埋管换热效率提供关键依据。There are many factors that affect the heat transfer performance of underground tube heat exchanger.Due to the difficulty,long duration,and high cost of field test,previous studies have mostly focused on a single factor,lacking a systematic understanding of its key factors.In view of this,this article proposes an identical-dimensionally physical model that can repeatedly test different influencing factors.Firstly,the heat transfer efficiency of the three-inlet and one-outlet pipes and single U-shaped buried tube heat exchangers was tested,and further,the effect of tube spacing on heat transfer was tested.The mechanism that affects heat transfer efficiency was analyzed through numerical simulation.The results show that under the two power conditions of 1.0 kW and 2.0 kW,compared to the single U-shaped buried pipe,the three-inlet and one-outlet configuration reduces borehole thermal resistance by 10.2%and 35.9%respectively,while improving the average energy efficiency coefficient by 3.4%and 28.8%correspondingly.When the spacing between the three-inlet and one-outlet pipes increases from 60 mm to 120 mm,the borehole thermal resistance decreases by 28.7%.The increase in pipe wall thickness leads to a linear increase in the outlet water temperature of the buried pipe and a linear increase in pipe wall thermal resistance.When expanding the spacing between pipes,both the outlet fuild temperature and temperature at the borehole center decrease,indicating that it can fully reduce thermal interference between pipes and achieve the goal of improving efficiency.Therefore,the three-inlet and one-outlet pipes fully utilize the characteristics of thinning the inlet pipe wall to reduce thermal resistance and increasing the thickness of the outlet pipe wall to reduce heat loss.Moreover,the overall heat transfer efficiency of buried pipes has been significantly improved through comprehensive measures such as increasing the heat transfer area through multiple pipes,increasing the tube spacing,and reducing thermal interference betwe

关 键 词：地源热泵系统 地埋管换热器 换热性能 水平等尺度物理模型 机理研究 

分 类 号：X38[环境科学与工程—环境工程] TU995[建筑科学—供热、供燃气、通风及空调工程]