流动参数对双级螺旋套管换热器传热性能的数值分析  

Numerical analysis of flow parameters on heat transfer performance of two-stage helically coiled heat exchangers

作　　者：李志强[1,2] 刘献飞 王方 朱彩霞[1,2] 张浩飞 王仕元[1,2] LI Zhiqiang;LIU Xianfei;WANG Fang;ZHU Caixia;ZHANG Haofei;WANG Shiyuan(School of Energy and Environment,Zhongyuan University of Technology,Zhengzhou 450007,China;Henan LNG Cold Energy Utilization Engineering Center,Zhengzhou 450007,China)

机构地区：[1]中原工学院能源与环境学院,河南郑州450007 [2]河南省LNG冷能利用工程研究中心,河南郑州450007

出　　处：《热科学与技术》2021年第5期431-437,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51906265);河南省高校科技创新人才支持计划资助项目(20HASTIT19);中国纺织工业联合会科技指导性计划资助项目(2019073);河南省高等学校重点科研资助项目(21A470009);中原工学院青年骨干教师培养计划资助项目(2020XQG03)。

摘　　要：高效热泵系统性能研究一直是热泵空调领域普遍关注的热点问题。针对设计开发的热泵系统双级套管串联式换热器,采用3D有限容积法和可实现的k-ε模型,数值分析入口流体温度、流动速度对整体传热系数以及内外管努塞尔数的影响规律。结果表明:降低入口水温或者增加入口制冷剂温度能够提高整体传热性能;Nu_(in)随着水和制冷剂流量的增加有所增加,而Nu_(out)随着水流量的增加而增加,但随着制冷剂流量则增加而减小;Nu_(in)和Nu_(out)都随着水温的减小或制冷剂温度的增大而增大。Research on the performance of high-efficiency heat pump systems has always been a hot issue in the field of heat pump air conditioning.For the designed two-stage helically coiled heat exchangers in the heat pump system,the 3 D finite volume method with the realizable k-εturbulence model is employed to investigate the influence of inlet fluid temperature and flow rates on the overall heat transfer coefficient and the Nusselt number of inner and outer tube.The results show that decreasing inlet water temperature or increasing inlet refrigerant temperature can improve thermal performance.Nu_(in)increases with an increase in water and refrigerant flow rate.Nu_(out)increases with increasing water flow rate.However,it is decreased with the increase of refrigerant flow rate.Both Nu_(in)and Nu_(out)increase with the decrease of water temperature or the increase of refrigerant temperature.

关 键 词：流动参数 热泵 螺旋管换热器 传热性能 努塞尔数 

分 类 号：TK172[动力工程及工程热物理—热能工程]