基于Taguchi方法强化翅片传热性能的C型换热器

C-type heat exchangers with fin heat transfer performance enhanced using Taguchi method

第二代风管机多采用V型分段拼接换热器,其翅片形状和表面强化结构一般均匀分布,在非均匀风场下的换热能力无法充分发挥。设计一种应用于风管机的C型换热器,采用Taguchi方法分别对高低风速区的翅片表面强化结构进行优化设计;选取5种方案进行换热仿真,对桥缝区域进行排水仿真,最终确定最优方案进行整机测试。结果表明,低风速区桥宽1.4 mm,桥高0.6 mm,桥数为4,高风速区桥宽1.2 mm,桥高0.6 mm,桥数为2时性能最佳。表面强化结构分区处理、上下侧非对称布置以及管间距非等宽设计使得C型翅片强化传热结构与风场分布精准匹配,并且兼顾排水性能。优化后的C型换热器相比于V型,APF平均提高6.4%,换热器成本降低14.5%。

The V-type segmented heat exchanger is commonly used in the second generation of fan coil air conditioner.The uniform distribution of fin shape and enhanced surface makes the heat transfer potential under non-uniform airflow field hardly fulfills.The C-type heat exchanger is designed and Taguchi method is used to optimize the fin surface enhancement in the high and low air velocity region,respectively.Five schemes are selected for simulation comparatively,and condensed water drainage of zones with different bridges are simulated.Optimal scheme is determined and tested experimentally.Results show that the performance reaches the best with 1.4 mm bridge width,0.6 mm bridge height and 4 bridges in low air velocity region,but 1.2 mm bridge width,0.6 mm bridge height and 2 bridges in high air velocity region.The heat transfer enhancement of the C-type fin and the airflow field matches accurately with favorable drainage performance,when the fin surface structure is enhanced by segment,upper and lower parts of the fin are arranged asymmetrically,and the tube spacing is unequally designed.Compared with the V-type one,APF is 6.4%higher while the cost is 14.5%lower on average for the optimized C-type heat exchanger.