Innovative enhanced tube surfaces for high-temperature condensation: the design, manufacturing and test

被引：0

作者：

Yongqiang Wu ^{[1
]}

Jiatong Jiang ^{[2
]}

Zhiping Zhang ^{[1
]}

Qingxue Yue ^{[1
]}

Hua Liu ^{[1
]}

Yang Bi ^{[2
]}

机构：

[1] GREE Electric Appliances,Institute of Refrigeration and Cryogenics, Engineering Research Center of Solar Power & Refrigeration

[2] INC. of Zhuhai,undefined

[3] Shanghai Jiao Tong University,undefined

来源：

Heat and Mass Transfer | 2025年 / 61卷 / 6期

关键词：

Heat pump; Enhanced tube; Heat transfer coefficients; Condensation; High temperature; R134a; Empirical formula;

D O I：

10.1007/s00231-025-03576-2

中图分类号：

学科分类号：

摘要：

Industrial heat pumps are essential in tackling environmental and energy issues, with high-temperature condensers being critical components. Their heat transfer performance largely determines heating capacity but declines significantly at elevated temperatures due to the attenuation of thermodynamic properties. However, enhanced heat transfer methods for high-temperature condensation remain under-researched. This study designs a novel enhanced tube (Tube1) featuring sub-fins, based on an analysis of film condensation enhancement mechanisms and CFD simulations, and proposes its fabrication method. Using R134a, condensation heat transfer characteristics of Tube1 were experimentally compared with those of a conventional three-dimensional tube (Tube2) and a smooth tube at saturation temperatures of 36 °C and 75 °C. At 75 °C, the heat transfer coefficients (HTCs) of Tubes 1 and 2 were 18.656 and 14.86 times higher, respectively, than that of the smooth tube. A heat flux transition appeared at 42 kW/m²: below this value, HTCs of Tube1 at 75 °C surpassed those at 36 °C; above it, the reverse occurred. Results demonstrate that Tube1 performs exceptionally well under high-temperature condensation. Additionally, a modified empirical formula for condensation HTC was developed, filling the data gap and offering practical value for the further development of enhanced heat transfer tubes.

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