不同结构布置空调用翅片管冷凝器性能的仿真研究.docx

不同结构布置空调用翅片管冷凝器性能 不同结构布置空调用翅片管冷凝器性能的仿真研究 刘金平 , 郑青玲 ( 华南理工大学 电力学院 , 广东 广州 510640 ) [ 摘要 ] 在空调用翅片管冷凝器的几何结构尺寸相同 , 空气的进口状态和流量相同的条件下 , 采用计算机 仿真技术 , 研究了支路数 、管排数对翅片管冷凝器的传热与流动特性的影响 , 结果表明 : 随着支路数的增 大 , 压降随之减小 , 最大值为 2 个支路时的 3318kPa , 最小值为 6 个支路时 , 仅为 019kPa ; 空气与制冷剂 间传热温差增大 , 总传热系数减小 , 冷凝器的换热量递减 , 最大值比最小值大 3211 % 。随着排数的增多 , 压降增大 , 4 排管的压降是 1 排管的 413 倍 ; 空气侧换热系数与制冷剂侧换热系数的变化呈相反趋势 , 但 传热温差增大 , 换热量也增大 , 4 排管的换热量是 1 排管的 2145 倍 。 [ 关键词 ] 翅片管 ; 冷凝器 ; 支路数 ; 排数 [ 中图分类号 TK 124 [ 文献标识码 A Numerical Simulation of Perf ormance of Fin - and - tube Condenser with Different Structural Arrangement in Air - conditioning System L IU J inping , ZHENG Qingling ( School of Electric Power , South China University of Technology , Guangzhou 510640 , Guangdong , China) Abstract : The effect of branch number and tube row number on heat transfer coefficient and flow characteristic under the condition of the same geometry size of condenser , air inlet temperature and flow rate was analyzed1The results show that pressure drop decreases as branch number increases , the maximum pressure drop is 159 times as big as the minimum pres2 sure drop ; the total heat transfer coefficient and heat transfer rate of condenser decreases as temperature difference between air and refrigerant increases , the maximum heat transfer rate is 3211 % greater than the minimum one ; pressure drop in2 creases as tube row number increases and the pressure drop of 4 row tubes is 413 times as big as 1 row tubes ; heat transfer coefficient at the air side shows an opposite trend with that at the refrigerant side , but heat transfer rate increases when temperature difference increases , heat transfer rate of 4 rows tubes is 2145 times as big as that of 1 row tubes1 Key words : Fin - and - tube ; Condenser ; Branch number ; Tube row number 换热器是一种在制冷 、空调 、化工等工业领域 广泛采用的换热设备 , 尤其在空调行业中 , 与系统 中其他部件相比 , 换热器的运行不仅涉及管内制冷 剂的相变 , 而且涉及管外空气的传热传质 , 其过程 十分复杂 。因此有必要对换热器性能进行进一步研 究以提高系统整体性能1 。目前对换热器的