地热换热器的传热分析  

HEAT TRANSFER ANALYSIS OF GROUND HEAT EXCHANGERS

作　　者：方肇洪[1] 刁乃仁[1] 曾和义 

机构地区：[1]山东建筑工程学院地源热泵研究所,山东济南250014

出　　处：《工程热物理学报》2004年第4期685-687,共3页Journal of Engineering Thermophysics

基　　金：山东省重点科技攻关项目"地热综合利用关键技术"资助(No.O11150105)

摘　　要：本文综述了作者近年来在地热换热器传热模型方面的研究:提出了分析竖直埋管地热换热器钻孔内的传热过程的准三维模型,考虑流体工质在深度方向上的温度分布,给出钻孔内热阻的解析表达式;求得有限长线热源在半无限大介质中的瞬态温度响应解析解;导得了有渗流时无限大介质中线热源温度响应的解析解。以上工作改进和深化了国际上现有的地热换热器传热模型,并已应用于工程设计和模拟。This paper summarizes the authors' study on heat transfer analyses of the ground heat exchangers (GHE). First, taking the fluid axial convective heat transfer and thermal 'short-circuiting' among U-tube legs into account, a quasi-3-D model for boreholes in GHEs is established, and analytical solutions of the fluid temperature profiles along the borehole depth have been obtained. Secondly, an explicit solution of the transient 2-D temperature response in a semi-infinite medium with a line-source of finite length has been derived to take the place of the Kelvin's 1-D line-source model. Finally, an explicit solution is also obtained for a line heat source in an infinite porous medium with water advection. These models are helpful to improve GHE design procedures, and are yet suitable for engineering applications.

关 键 词：地源热泵 地热换热器 传热 地下水渗流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]