Film condensation heat transfer characteristics of R1234ze(E) on a horizontal three-dimensional finned tube

被引：0

作者：

Tian, Haochen ^{[1
]}

Ma, Zhixian ^{[1
]}

Wang, Zhihao ^{[1
]}

机构：

[1] Institute of Building Energy, Dalian University of Technology, Liaoning, Dalian

来源：

Huagong Xuebao/CIESC Journal | 2025年 / 76卷 / 03期

关键词：

3D tube; condensation; heat transfer; model; R1234ze(E);

D O I：

10.11949/0438-1157.20240890

中图分类号：

学科分类号：

摘要：

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. © 2025 Materials China. All rights reserved.

引用

页码：975 / 984

页数：9

共 30 条

[1]

Gil B, Kasperski J., Efficiency evaluation of the ejector cooling cycle using a new generation of HFO/HCFO refrigerant as a R134a replacement, Energies, 11, 8, (2018)

[2]

Devecioglu A G, Oruc V., Characteristics of some new generation refrigerants with low GWP, Energy Procedia, 75, pp. 1452-1457, (2015)

[3]

Hossain M A, Onaka Y, Miyara A., Experimental study on condensation heat transfer and pressure drop in horizontal smooth tube for R1234ze(E), R32 and R410A, International Journal of Refrigeration, 35, 4, pp. 927-938, (2012)

[4]

Mota-Babiloni A, Navarro-Esbri J, Moles F, Et al., A review of refrigerant R1234ze(E) recent investigations, Applied Thermal Engineering, 95, pp. 211-222, (2016)

[5]

Del Col D, Bortolato M, Azzolin M, Et al., Condensation heat transfer and two-phase frictional pressure drop in a single minichannel with R1234ze(E) and other refrigerants, International Journal of Refrigeration, 50, pp. 87-103, (2015)

[6]

van Rooyen E, Thome J R., Pool boiling data and prediction method for enhanced boiling tubes with R-134a, R-236fa and R-1234ze(E), International Journal of Refrigeration, 36, 2, pp. 447-455, (2013)

[7]

Ko J W, Jeon D S, Kim Y L, Et al., Experimental study on film condensation heat transfer characteristics of R1234ze(E) and R1233zd(E) over horizontal plain tubes, Journal of Mechanical Science and Technology, 32, 1, pp. 527-534, (2018)

[8]

Li L., Experiment on condensation and unsteady characteristics of HFO1234ze outside strengthened tube, (2019)

[9]

Nagata R, Kondou C, Koyama S., Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E), International Journal of Refrigeration, 63, pp. 157-170, (2016)

[10]

Ji W T, Chong G H, Zhao C Y, Et al., Condensation heat transfer of R134a, R1234ze(E) and R290 on horizontal plain and enhanced titanium tubes, International Journal of Refrigeration, 93, pp. 259-268, (2018)

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