新型热泵热水系统冷凝器的传热特性与[火积]分析  

Heat Transfer Characteristics and Entransy Analysis of a New Type of Condenser in the Heat Pump Hot Water System

作　　者：李凡 刘兴非 刘彦杰 陆高锋 翟晓强[1] LI Fan;LIU Xingfei;LIU Yanjie;LU Gaofeng;ZHAI Xiaoqiang(Shanghai Jiao Tong University,Shanghai 200240,China;Chunyi Environmental Technology Co.,Ltd.,Jingjiang 214500,Jiangsu,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200020 [2]春意环境科技有限公司,江苏靖江214500

出　　处：《制冷技术》2021年第5期26-31,共6页Chinese Journal of Refrigeration Technology

摘　　要：本文提出了一种新型热泵热水系统冷凝器,其水侧为加装内环肋的环形流道,制冷剂侧为包裹在环形通道外壁上的微通道换热器。以该冷凝器结构为基础,采用数值仿真对其水侧的流动和传热机理进行了研究,并进一步对不同肋间距和肋高下的传热特性进行了分析。结果表明,在雷诺数为5029~10066范围内,外壁平均努塞尔数随着肋间距的减小呈现出先增后减的趋势,当肋片数为8时最大,相比光管增加了12%~18%;随着肋高的增加,努塞尔数逐渐增大,当肋高为20 mm时最大,相比光管增加了29%~34%。此外,通过[火积]理论分析了肋间距和肋高对传热性能的影响,为结构优化提供支撑。A new type of condenser in the heat pump hot water system is proposed in this paper.The water side is an annular flow channel with inner annular ribs,and the refrigerant side is a microchannel heat exchanger wrapped on the outer wall of the annular channel.Based on the structure of the condenser,the mechanism of flow and heat transfer in the water side is studied by numerical simulation,and the heat transfer characteristics with different rib spacings and rib heights are analyzed.The results show that when the Reynolds number is in the range of 5029-10066,the average Nussel number of the outer wall increases first and then decreases with the decrease of the rib spacing.When the rib number is 8,the Nussel number reaches the maximum value increasing by 12%-18%compared with that of the smooth tube.With the increase of rib height,the Nussel number increases gradually,and reaches the maximum when the rib height is 20 mm,which increases by 29%-34%compared with the smooth tube.In addition,the influence of rib spacing and rib height on heat transfer performance is analyzed by the theory of entransy,which provides support for the optimization of the structure.

关 键 词：冷凝器 环形流道 内环肋 [火积]耗散 

分 类 号：TQ051.5[化学工程] TK124[动力工程及工程热物理—工程热物理]