The influence of surface structure and thermal conductivity of the tube on the condensation heat transfer of R134a and R404A over single horizontal enhanced tubes

2017 ◽  
Vol 125 ◽  
pp. 1114-1122 ◽  
Author(s):  
Chuang-Yao Zhao ◽  
Wen-Tao Ji ◽  
Pu-Hang Jin ◽  
Ying-Jie Zhong ◽  
Wen-Quan Tao
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Surface Structure ◽  
Condensation Heat Transfer ◽  
Enhanced Tubes

An Experimental Study of R134a Condensation Heat Transfer in Horizontal Smooth and Enhanced Tubes

2021 ◽  
Author(s):  
Wei Li ◽  
Yu Guo ◽  
Xiang Ma ◽  
Gu Zongbao ◽  
Zahid Ayub ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Condensation Heat Transfer ◽  
Enhanced Tubes

An Experimental Study of R134a Condensation Heat Transfer in Horizontal Smooth and Enhanced Tubes

2021 ◽  
Author(s):  
Wei Li ◽  
Yu Guo ◽  
Xiang Ma ◽  
Gu Zongbao ◽  
Zahid Ayub ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Condensation Heat Transfer ◽  
Enhanced Tubes

Investigation on Heat Transfer Performance and Mechanism of New Condensation Enhanced Tubes with Machined Surface

2013 ◽  
Vol 668 ◽  
pp. 603-607
Author(s):  
Jian Sheng Wang ◽  
Yan Zhe Li
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Surface Structures ◽  
Condensation Heat Transfer ◽  
Smooth Tube ◽  
Machined Surface ◽  
Alcohol Vapor ◽  
Enhanced Tubes ◽  
Condensation Heat Transfer Coefficient

At present, researchers pay close attention to heat transfer enhancement, and many new surface structures are developed. Two kinds of new condensation enhanced tubes with machined surface, namely NO.1 and NO.2, are put forward. The experimental results show that the enhanced tubes can improve condensation heat transfer evidently, which is due to the special internal and external surface structures. With water vapor as condensation medium, the enhancement ratios of total heat transfer coefficient (k) are 1.6-2.4 and 1.47-1.8 comparing with smooth tube, respectively, and the ratios of outside condensation heat transfer coefficient (ho) are 5.67-6.67 and 3-4 correspondingly. With alcohol vapor as condensation medium, the average enhancement ratios of k are 3 and 2 times as great as that of smooth tube, and the ratios of ho are 3-4.25 and 2.25-3.5 correspondingly.

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