节流短管在大容量空调机组中的应用

Application of short tube restrictor into high capacity air-conditioning unit

对在大容量空调机组中应用节流短管作为制冷系统节流机构的可行性进行分析,并通过试验方法对在同一款空调机组上分别采用节流短管组件、毛细管和热力膨胀阀作为节流机构时的整机性能进行测试和对比。试验结果表明,空调机组采用多分路节流短管组件作为节流和分液机构时,各回气支路温度的标准偏差仅为1.39℃,其分液均匀性明显优于采用热力膨胀阀或毛细管节流;此外,制冷量比采用毛细管和热力膨胀阀分别提高5.7%和4.2%,能效比也比采用毛细管和热力膨胀阀分别提高5.5%和6.2%,可有效地提高蒸发器的换热能力和整机能效比。

The application feasibility in the refrigeration system into the high of the short tube restrictor as throttle mechanism capacity air-conditioning unit is analyzed, and the performance of the same air-conditioning unit using short tube restrictor, capillary or ther- mostatic expansion valve as throttle mechanism is tested and contrasted. The experiment result proves that the temperature standard deviation of each loop of evaporator using short tube restrictor is 1.39℃, which is superior to that using capillary or thermostatic expansion valve. The liquid separated uniformity of the short tube restrictor is better than that of capillary or thermostatic expansion valve. Furthermore, the refrigerating capacity rises 5.5% or 6. 2%, and the EER 5.7% or 4. 2% compared to that using capillary or thermostatic expansion valve. The conclusions indicate that the capacity of evaporator and the EER of air-conditioning unit with short tube restrictor are promoted in contrast with capillary or thermostatic expansion valve.