化工学报2025，Vol.76Issue(3)：975-984,10.DOI:10.11949/0438-1157.20240890
R1234ze(E)水平三维肋管外膜状凝结特性实验研究
Film condensation heat transfer characteristics of R1234ze(E)on a horizontal three-dimensional finned tube
摘要
Abstract
The development of shell-and-tube condensers for large-scale high-efficiency heat pumps requires the film condensation heat transfer characteristics when new environmentally friendly working fluids are combined with high-efficiency condenser tubes.This study experimentally determined the film-boiling heat transfer characteristics of R1234ze(E)on the outside of a horizontal high-efficiency condensing tube and compared the differences in film-boiling characteristics between R1234ze(E)and R134a on the outside of a horizontal three-dimensional finned tube.A model for the film-boiling heat transfer coefficient of R1234ze(E)on the outside of a horizontal novel three-dimensional finned tube was established.The experimental high-efficiency condensing tube used was T2 copper with an outside diameter of 19.05 mm,a height of 0.9 mm,a fin density of 1811 fpm on the bottom and 77 fins per circumference on the top.The results show that at a condensing temperature of 38℃,the heat flux increased from 23.6 kW/m2 to 46.1 kW/m2,and the film-boiling heat transfer coefficient of R1234ze(E)on the outside of the experimental three-dimensional finned tube αo,1234ze(E)decreased from 30.9 kW/(m2·K)to 26.5 kW/(m2·K)(a decrease of 14.2%);at the same heat flux(37.6 kW/m2),the condensing temperature increased from 30℃to 46℃,αo,1234ze(E)decreased from 33.9 to 24.3 kw/(m2·k)(a decrease of 28.3%);at the same heat flux conditions,the film-boiling heat transfer coefficient of R1234ze(E)on the outside of the experimental three-dimensional finned tube could be up 22.9 to 24.5 times that of a smooth tube;at the same condensing temperature(38℃)and heat fluxes ranging from 10 to 50 kW/m2,the film-boiling heat transfer coefficient of R1234ze(E)on the outside of the experimental three-dimensional finned tube was 1.09 to 1.25 times that of R134a.A new three-dimensional horizontal external condensation heat transfer coefficient model for R1234ze(E)is established,and the deviation between the predicted value and the experimental results is±3.0%.The research results have reference value for the development of high efficiency shell and tube condenser for heat pump by using R1234ze(E)and new three-dimensional ribbed tube.关键词
凝结/传热/模型/三维肋管/R1234ze(E)Key words
condensation/heat transfer/model/3D tube/R1234ze(E)分类
能源与动力引用本文复制引用
田浩辰,马志先,王之浩..R1234ze(E)水平三维肋管外膜状凝结特性实验研究[J].化工学报,2025,76(3):975-984,10.基金项目
国家自然科学基金项目(51606049) （51606049）
