制冷学报2017，Vol.38Issue(1)：100-106,112,8.DOI:10.3969/j.issn.0253-4339.2017.01.100
变制冷剂流量制冷系统过热度振荡机理实验研究
Experiment on Hunting Mechanism of Superheated Temperature of a Variable Refrigerant Volume Refrigeration System
摘要
Abstract
To experimentally investigate the hunting mechanism of superheated temperature of a variable refrigerant volume refrigeration system, the opening of electronic expansion valve, the capacity of chilled water and the outlet temperature of cooling water are changed. The results show that when the opening of electronic expansion valve is at 24. 7 % -25. 3 %, the humting amplitude of superheated tem-perature is less than 1 K. With the opening increasing (25. 6% -26. 2%), the humting amplitude is about 3 K. When the opening is at 26. 5% -26. 8%, the amplitude goes back to less than 1 K. Moreover, the change of heat transfer in evaporator is the primary cause to hunting of superheated temperature, and heating load and refrigerant mass flow are the important parameters for in-tube boiling heat trans-fer, and both of them should be considered in the investigation for hunting of superheated temperature. In addition, pressure ratio has greater effect on refrigerant mass flow. When the system is at the first stage of increasing pressure ratio, the mass flow rate of refrigerant also increases, and the surface coefficient of heat transfer sharply increases while superheated temperature decreases. When the pressure ratio is sequentially increasing, the mechanism of heat transfer keeps alternation between convective boiling of liquid film and heat transfer of superheated vapor. The mechanism of hunting of superheated temperature for closed-loop control of expansion valve-evaporator is more complicated, which should be focused in later research.关键词
电子膨胀阀/过热度/系统振荡Key words
electronic expansion valve/superheated temperature/hunting分类
通用工业技术引用本文复制引用
虞中旸,陶乐仁,王超,沈冰洁..变制冷剂流量制冷系统过热度振荡机理实验研究[J].制冷学报,2017,38(1):100-106,112,8.基金项目
本文受上海市动力工程多相流动与传热重点实验室项目（1N-15-301-101）资助。（ The project was supported by the Key Laboratory of Multiphase Flow and Heat Transfer in Shanghai Power Engineering （NO.1N-15-301-101）.） （）
