摘要
在制冷系统中,性能系数受到多个因素的影响,冷风机的性能是重要因素之一。分流器对节流后的制冷剂等干度、等流量分配的性能直接影响冷风机的综合传热特性。本实验优化设计了一种预混喷嘴式分流器(A)并建立实验台测试分流器性能。实验采用R22制冷剂,设计工况为库温-18℃,分别在0、-4、-8、-12、-16、-18、-20℃,7种库温工况下进行实验测试。测试结果与带喷嘴式分流器(B)、气液分离式分流器(C)、CAL分流器(D)、文丘里式分流器(E)进行对比,得到分流器综合性能从大到小为:A>B>C>D>E,分流器A的过热度、不均匀度、传热系数、制冷量均优于其他4种分流器,采用分流器A能够减小冷风机传热温差,降低不可逆损失,提高系统性能表现。
The performance of a refrigeration system is affected by many factors, and cooling fan is one of the important factors. The shunt directly influences the heat transfer performance of the cooling fan, such as the iso-dryness and equal-flow distribution of refrigerant. In this experiment, a new type of premixed nozzle shunt(A) is designed, and a test bench is built to test the shunt performance. Improving the efficiency of the refrigeration system and saving energy are certainly significant. An R22 refrigerant was used in the experiment, and the design condition was a cold storage temperature of-18 ℃. Experiments were carried out at 0,-4,-8,-12,-16,-18, and-20 ℃(cold storage temperature). The test results were compared with another nozzle shunt(B), gas-liquid separation shunt(C), CAL shunt(D), and Venturi shunt(E). The comprehensive performance of the shunts followed the order from good to bad, i.e., A > B > C > D > E. The overheat, inhomogeneity, heat transfer coefficient, and cooling capacity of A were better than those of the others. Adopting the A shunt reduced the fan heat transfer temperature difference and irreversible loss and improved the system performance.
作者
李文清
Li Wenqing(Tianjin Key Laboratory of Refrigeration Technology, Tianjin Refrigeration Engineering Technology Center, Refrigeration Engineering Research Center of Ministry of Education of China, Tianjin University of Commerce, Tianjin, 300134,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2019年第4期101-106,共6页
Journal of Refrigeration
基金
天津市自然科学基金(16JCQNJC06600)项目资助~~
