摘要
对非共沸制冷剂R410A在一根水平光管和2根25.4 mm水平双侧强化管管外冷凝换热特性进行研究。分别研究在变入口水温和变水流量的条件下,制冷剂的管外冷凝换热特性。利用Wilson图解法和Wilson-Gnielinski法计算管外冷凝换热系数,并分析两种处理方法所得到的管外冷凝换热系数的差异,最后根据Nusselt管外关联式推出强化管管外冷凝换热关联式。试验研究表明:光管管外冷凝换热系数随入口水温的升高而升高,而2根双侧强化管则与之相反;光管和强化管的管外冷凝换热系数都会随着水流量的增大而增大;并随着饱和温度的升高而增大。双侧强化管EX1平均管外冷凝换热系数为光管的6.5倍,而EX2平均管外冷凝换热系数为光管的6.1倍,EX1的冷凝换热较EX2提升了6%。
The condensation heat transfer characteristics of non-azeotropic refrigerant R410A outside a horizontal bare tube and two 25.4 mm horizontal tubes were studied.The condensation heat transfer characteristics of R410A outside the tubes were studied under the condition of variable inlet water temperatures and variable water flow rates,respectively.The condensation heat transfer coefficients outside the tubes were calculated by Wilson diagram method and Wilson-Gnielinski method,and the differences of the condensation heat transfer coefficients were analyzed,and then,the condensation heat transfer correlation outside the enhanced tubes was deduced according to Nusselt correlation.The experimental results show that the condensation heat transfer coefficients outside the bare tube increased with the increasing of the inlet water temperature,while the double enhanced tubes decreased;both the condensation heat transfer coefficients outside the bare tube and the enhanced tubes increased with the increase of the water flow rate;and also increased with the increase of the saturation temperatures.The average condensation heat transfer coefficient of EX1 was 6.5 times of that of EX2,and the average condensation heat transfer coefficient of EX1 was 6.1 times of that of EX2.The condensation heat transfer of EX1 was 6%higher than that of EX2.
作者
周卓
黄理浩
陈建红
陶乐仁
黄嘉宇
成简
ZHOU Zhuo;HAUANG Lihao;CHEN Jianhong;TAO Leren;HUANG Jiayu;CHENG Jian(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China;Shanghai First Refrigerator Factory Co.,Ltd.,Shanghai 201901,China)
出处
《流体机械》
CSCD
北大核心
2021年第4期97-104,共8页
Fluid Machinery
基金
国家高科技研究发展计划项目(2008AA05Z204)
上海市动力工程多相流动与传热重点试验室(13DZ2260900,2019KJFZ201)。
关键词
R410A
变入口水温
变水流量
管内关联式
管外关联式
R410A
variable inlet water temperature
variable water flow
in-tube correlation
out-of-tube correlation
