小管径空调冷凝器翅片的优化

Optimization on Condenser Fin in Air Conditioners with Small Tube Diameter

空调小管径换热器可降低成本、减少制冷剂充注量,对实现节能减排意义重大。对5 mm单排管空调冷凝器的平直翅片进行优化,以代替一款7 mm单排管空调冷凝器。优化对象为管间距、片宽和翅片间距,优化目标为增大换热量、减小空气侧压降并降低成本。选用田口法进行实验设计和单目标优化,用灰色关联度分析和综合性能指标法进行多目标优化,最终优化结果为管间距16.0 mm,片宽16 mm,片距1.4 mm,换热量与D7管原型机持平,压降降低35%,成本降低26%,可成功代替7 mm冷凝器。

Small-diameter heat exchangers for air conditioning can reduce cost and refrigerant charge,which is of great significance for realizing energy savings and emission reduction.In this study,the plate fins of a 5 mm single-row air-conditioning condenser are optimized to replace a 7 mm single-row air-conditioning condenser.The optimization variables are tube spacing,fin width,and fin spacing,and the objectives are to maximize heat transfer and minimize air-side pressure drop and cost.The Taguchi method was selected for the experimental design and single-objective optimization,and the grey relational analysis and comprehensive performance index method were used for multi-objective optimization.The final optimum tube spacing,fin width,and fin spacing were 16.0 mm,16 mm,and 1.4 mm,respectively.The heat transfer was the same as that of the 7 mm tube condenser.The pressure drop was reduced by 35%,and the cost was reduced by 26%,validating the effective replacement of the 7 mm condenser.