能源桩三维螺旋线热源的瞬态传热模型  

Transient heat transfer model of a three-dimensional spiral heat source in an energy pile

作　　者：李庆文[1,2] 郑明阳 乔兰[1,2] 隋智力[4] LI Qing-wen;ZHENG Ming-yang;QIAO Lan;SUI Zhi-li(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Urban Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China;China Railway Siyuan Survey and Design Group Co.,LTD.,Wuhan 430061,China;Urban Construction School,Beijing City University,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学城市地下空间工程北京市重点实验室,北京100083 [3]中铁第四勘察设计院集团有限公司,武汉430061 [4]北京城市学院城市建设学部,北京100083

出　　处：《工程科学学报》2021年第11期1569-1576,共8页Chinese Journal of Engineering

基　　金：北京市教育委员会科技计划一般资助项目(KM202011418001);中央高校基本科研业务费专项资金资助项目(FRF-BD-19-004A)。

摘　　要：将螺旋埋管等效为三维螺旋线热源,考虑螺旋埋管能源桩的传热过程,运用格林函数和第一型曲线进行积分,推导给出了考虑时间、空间位置、埋管参数和岩土体热物理性质4参数的螺旋埋管能源桩的温度场解析解,建立高精度三维螺旋埋管能源桩的传热模型.并通过在数值模拟软件中建立螺旋埋管能源桩三维模型,依据边界条件,求解得出三维螺旋埋管能源桩温度场数值解.对比结果表明:所建立的能源桩三维螺旋线热源模型具有很高的解析精度.最后,基于解析模型讨论了螺旋埋管能源桩换热温度场的空间分布和时间效应.An energy pile is a new type of ground source heat pump system. A heat exchanger is casted into the concrete pile foundation of a building structure for the purpose of heating or cooling the building through heat exchange between the pile foundation and surrounding soil. An energy pile can be developed rapidly because of its high heat transfer efficiency and stable structure and because it requires no additional drilling requirements. In the long-term operation, energy piles have to bear both the overlying and thermal loads caused by changes in the temperature field. Thus, accurately evaluating the temperature field of an energy pile and its surrounding soil is one of the key problems in the design and application of energy piles. To improve the heat transfer efficiency of energy piles, U-type, W-type, spiral type, and similar types of coils have been developed to be casted into the energy pile. Results of thermal efficiency analysis show that the spiral type coil has the best heating and cooling performance and was nearly 150% more thermally efficient than the double U-type coil. Thus, a spiral coil is selected as the main coils’ form in the current practical application.However, due to the complex heat exchange structure of the spiral pipe, the present analytical model had to be simplified to accurately characterize the temperature field characteristics of a spiral pipe casted in an energy pile. In this paper, the spiral pipe was regarded as a three-dimensional spiral heat source. Considering the existing heat transfer model, an analytical solution of the temperature field was obtained by integrating green’s function and the first curve function;then, the high-precision, three-dimensional(3-D) heat transfer model of the spiral pipe was established considering the time, space, buried pipe parameters, and thermal property of host soil. In addition, a 3-D model of a spiral pipe casted in an energy pile was created in the numerical simulation software COMSOL;after simulation, the numerical solution of the tempe

关 键 词：能源桩 螺旋埋管 传热模型 温度场 解析解 

分 类 号：TU470[建筑科学—结构工程]