地下层状结构土体中埋管换热器的传热分析  

HEAT TRANSFER ANALYSIS OF UNDERGROUND HEAT EXCHANGERS IN MULTI-SOIL BEDS

作　　者：王泽生[1] 颜爱斌[1] 郭进京[2] 

机构地区：[1]天津城市建设学院能源与机械工程系,天津300384 [2]天津城市建设学院土木工程系,天津300384

出　　处：《太阳能学报》2009年第2期188-192,共5页Acta Energiae Solaris Sinica

基　　金：天津市高等学校科技发展基金项目(20060822)

摘　　要：针对天津滨海新区100m内土体分层的特点,建立了U形管埋地换热器外部土层的分层稳态导热模型,并采用Eskilson理论模型对其温度分布进行了数值模拟分析。结果表明,由于该地区地下土层上下水平层传热性能由弱变强的规律,换热器管中的水温先是较为缓慢下降,然后经历了较快的下降过程,由此导致了深处较明显的"热短路"。因此垂直方向各层土之间的热相互作用不能忽略,而且应在进水管和出水管之间采取防止"热短路"的措施,以提高埋地换热器的换热性能。Heat conduction model of underground heat exchangers in multi-soil beds to the depth of 100 meters is present- ed aeeording to the geologic charaeter of the new eeonomic area of Tianjin. Numerical simulation and analysis is also presented on the established model and Eskilson＇ s model. The results of simulation show that, as the higher ability of heat transfer of the deeper soil beds, the temperature of the water in underground heat exchangers firstly deereases slowly and then goes down fast, and it thus causes a serious heat short circuit between the input and output tubes of the underground heat exchangers. The vertical heat interaction between the multi-soil beds should not be neglected and some measure- ments should be taken to deerease the heat short circuit so as to increase the effieieney of the underground heat exchangers.

关 键 词：地源热泵 U形管换热器 分层导热模型 数值模拟 Eskilson理论模型 

分 类 号：TK521[动力工程及工程热物理—热能工程]