海水源热泵抛管式换热器管外传热特性研究  

STUDY OF A HELICAL COIL OUTSIDE HEAT TRANSFER CHARACTERISTICS FOR SEAWATER-SOURCE HEAT PUMP

作　　者：张潇潇 王智伟[1] 刘艳峰[1] 徐兰静 Zhang Xiaoxiao;Wang Zhiwei;Liu Yanfeng;Xu Lanjing(School of Environment and Municipal Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《太阳能学报》2020年第2期225-231,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金重大项目课题(51590911)。

摘　　要：为给海水源热泵抛管式换热器的优化设计提供理论依据,通过计算流体力学(CFD)数值软件对该系统中的流动和传热过程进行数值模拟。结果表明,管内对流换热努谢尔特数Nui随抛管曲率比δ、无因次节距H_o的增大而减小;管外Nu_o随δ、H_o的增大而减小,而且δ和H_o对Nu_o的影响是复杂非线性关系。在一定模拟工况下,管外表面传热系数比管内小,热阻比管内大,换热器传热性能的决定性因素在管外,基于此,该文通过数值模拟拟合出适于南海岛礁海水源热泵抛管式换热器管外传热准则关联式。To provide a support for the optimized design of a helical coil heat exchanger used in seawater-source heat pump. CFD software was used to simulate the processes of flow and heat transfer in the system. The results show that the inside convection heat transfer Nusselt number Nuidecreases with the increasing δ and H_o. The outside Nu_o decreases with the increasing δ and H_o. The effect of the δ and H_o on the Nu_o are a very complex nonlinear relation. Under specific simulation conditions,the surface heat transfer coefficient of the outside is smaller than the inside and the heat transfer resistance is greater than the inside. The decisive factor of the heat transfer performance of the heat exchanger is outside helical coil. So the numerical simulation is used to fit the convective heat transfer criterion formula for the South China Sea reef seawater-source heat pump.

关 键 词：换热器 传热分析 数值模拟 努谢尔特数 准则关联式 

分 类 号：TK172[动力工程及工程热物理—热能工程]