竖直单U型地埋管换热器埋管间负热阻现象的参数化研究与分析  

PARAMETRIC ANALYSIS OF NEGATIVE THERMAL RESISTANCE BETWEEN PIPES OF VERTICAL SINGLE U-TUBE GROUND HEAT EXCHANGER

作　　者：李露茜 廖全[1] 刘贤燕 彭清元 Li Luxi;Liao Quan;Liu Xianyan;Peng Qingyuan(College of Energy and Power Engineering,Chongqing University,Chongqing 400044,China;Nanjiang Hydrogeological Engineering Geological Team of Chongqing Geological Exploration Bureau,Chongqing 401121,China)

机构地区：[1]重庆大学能源与动力工程学院,重庆400044 [2]重庆市地勘局南江水文地质工程地质队,重庆401121

出　　处：《太阳能学报》2024年第3期210-216,共7页Acta Energiae Solaris Sinica

基　　金：重庆市科技计划(YDZX20195000004938)。

摘　　要：基于Mutipole方法对竖直单U型地埋管换热器钻孔内外的耦合传热过程进行求解,在钻孔内三热阻和四热阻简化传热模型基础上,详细地分析钻孔内的复杂稳态传热过程,参数化研究埋管布置结构、回填料与岩土热物性等因素对钻孔内埋管间直接传热热阻的影响规律,揭示导致钻孔内埋管间负热阻现象的本质原因,对钻孔内热阻传热模型的工程实践应用给出参考意见。This paper solves the coupled heat transfer process inside and outside the borehole wall of a vertical single U-tube ground heat exchanger by using the Mutipole method,analyses the steady-state heat transfer process within the borehole based on the simplified three and four thermal resistance models,parametrically investigates the influence of the pipe layout,thermal properties of grout/soil and other factors on the direct thermal resistance between pipes in the borehole,reveals the mechanism of the negative thermal resistance phenomenon between pipes in the borehole,and some constructive suggestions have been proposed for the industrial application of the simplified thermal resistance model within borehole.

关 键 词：地源热泵 换热器 热阻 负热阻现象 Multipole法 

分 类 号：TK521[动力工程及工程热物理—热能工程]