埋深及连接管长度对U型深埋管换热的影响  

EFFECT OF BURIED DEPTH AND CONNECTING PIPE LENGTH ON DEEP-BURIED U-BEND PIPE HEAT TRANSFER

作　　者：李超 江超 杨瑞涛 刘建宏 杨超辉 官燕玲[1] Li Chao;Jiang Chao;Yang Ruitao;Liu Jianhong;Yang Chaohui;Guan Yanling(School of Civil Engineering y Chang'an University,Xi'an 710054,China;Shaanxi Yanchang Petroleum International Exploration and Development Engineering Co.,Ltd.,XVan 710075,China)

机构地区：[1]长安大学建筑工程学院,西安710054 [2]陕西延长石油国际勘探开发工程有限公司,西安710075

出　　处：《太阳能学报》2021年第7期490-496,共7页Acta Energiae Solaris Sinica

基　　金：中央高校基本科研业务费专项(300102280710);陕西省2021年自然科学基础研究计划(2021JM-176);延长石油西化小区中深层地热能清洁供暖先导试验研究项目-深层地埋管强化换热技术研究。

摘　　要：针对U型深埋管换热系统,研究埋管深度(H)及两竖管之间的连接长度(Dc)对埋管换热的影响。结合某个实际的深埋管地热能建筑供暖工程,在得到埋管钻井温度、埋管竖向岩土解释数据及钻井岩芯热物性参数的基础上,建立5种不同埋深及水平连接管长度的埋管换热数值模型。通过计算对比表明,U型深埋管的换热性能受H及Dc的影响显著,H不变而Dc持续增加时,虽然埋管的延米换热量持续增加,但其增加率却逐渐减小;Dc不变而H持续增加时,埋管的延米换热量持续增加且增加率基本保持不变。Aiming at the deep-buried U-bend pipe heat exchange system,the effects of buried depth(H)and connecting pipe length(Dc)between two standpipes on the heat transfer of the buried pipes are proposed.Combined with an actual deep-buried geothermal energy building heating project,five different numerical models with different buried depth and horizontal connecting pipe length were established based on obtaining the drilling temperature,the vertical ground interpretation data of the buried pipe,and the thermal physical properties of the drilling core.Numerical calculations show that the heat transfer performance of deep-buried U-bend pipes is significantly affected by H and Dc.When H is constant and Dc continues to increase,although the heat transfer rate per meter of the buried pipe continues to increase,the increase rate gradually decreases.When Dc is constant and H continues to increase,the heat transfer rate per meter of the buried pipe continues to increase and the increase rate remains basically unchanged.

关 键 词：数值模拟 换热性能 地热采暖 埋深 连接管长度 

分 类 号：TK529[动力工程及工程热物理—热能工程]