低频工况下电子膨胀阀的调节特性  

Adjustment characteristics of electronic expansion valves at low frequency

作　　者：丁夏杰 陶乐仁[1] 任凯 DING Xia-jie;TAO Le-ren;REN Kai(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《化学工程》2023年第2期83-88,共6页Chemical Engineering(China)

基　　金：上海市动力工程多相流动与传热重点实验室基金项目(1N-15-301-101);国家高科技研究发展计划项目(2008AA05Z204)。

摘　　要：基于一台R32冷水机组,通过实验研究了低频工况下换热器水侧出口温度、阀前过冷度对于电子膨胀阀调节特性和系统性能的影响,得到以下结论:低频率下吸气过热度对于膨胀阀开度的改变更加敏感,此实验中相同的过热度范围,35 Hz的膨胀阀调节范围为3%,比50 Hz下降9%,容易造成膨胀阀过调的现象,影响系统的稳定性;过冷度对于膨胀阀的敏感问题没有改善作用,而提高水侧出口温度可以扩大阀的调节范围,此实验中冷却水出口温度提高5℃,膨胀阀开度调节范围扩大2.8%;冷冻水出口水温提高4℃,膨胀阀开度调节范围提高2.6%,提高系统稳定性,但过度提高水侧出口温度会影响机组的性能,在实际的应用过程中需要结合实际情况调节水侧出口温度。The influences of the outlet water temperature of the exchangers and supercooling on the regulation characteristics of the electronic expansion valve(EEV) and the system′s performance were studied experimentally with an R32 chiller. The results show that the suction superheat is more sensitive to the change of the valve opening under low frequency. In the case of the same suction superheat, at 30 Hz, the adjustment range of the expansion valve is 3%, which is 9% smaller than that at 50 Hz, which is negative to the stability of the system. The subcooling does not affect the overshoot of the valve, but the increase in the outlet temperature of the water of the exchangers can expand the adjustment range of the valve to improve the problem. The outlet temperature of cooling water is increased by 5°C, the adjustment range of the expansion valve opening is increased by 2.8%;the chilled water outlet water temperature is increased by 4°C, and the EEV opening adjustment range is increased by 2.6%, which improves the system stability, but excessively increasing the water-side outlet temperature will affect the performance of the unit which needs to be adjusted according to the actual situation in the actual application process.

关 键 词：变频压缩机 低频率 电子膨胀阀 

分 类 号：TB61[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]