AUGMENTATION OF CONDENSATION HEAT TRANSFER BY INTERNALLY FINNED TUBES AND TWISTED TAPE INSERTS

1982 ◽  
Author(s):  
N. Z. Azer ◽  
S. A. Said
Keyword(s):  
Heat Transfer ◽  
Condensation Heat Transfer ◽  
Twisted Tape ◽  
Finned Tubes

The influence of fin structure and fin density on the condensation heat transfer of R134a on single finned tubes and in tube bundles

2016 ◽  
Vol 100 ◽  
pp. 582-589 ◽  
Author(s):  
Alaa Ruhma Al-Badri ◽  
Andreas Bär ◽  
Achim Gotterbarm ◽  
Michael Heinrich Rausch ◽  
Andreas Paul Fröba
Keyword(s):  
Heat Transfer ◽  
Condensation Heat Transfer ◽  
Finned Tubes ◽  
Tube Bundles

Experimental Study on Condensation Heat Transfer and Flow Modes of R245fa on Enhanced Surface Tubes

2015 ◽  
Vol 23 (02) ◽  
pp. 1550014 ◽  
Author(s):  
Daisuke Jige ◽  
Tomonobu Matsuno ◽  
Norihiro Inoue
Keyword(s):  
Heat Transfer ◽  
Saturation Temperature ◽  
Condensation Heat Transfer ◽  
Flow Mode ◽  
Heat Transfer Characteristics ◽  
Enhanced Heat Transfer ◽  
Finned Tubes ◽  
Transfer Characteristics ◽  
Grooved Tube ◽  
Enhanced Surface

The present study experimentally investigated the condensation heat transfer characteristics and condensate flow mode of R245fa on horizontal low-finned and microscopic-grooved tubes. Five low-finned tubes and a microscopic-grooved tube with tube diameters at the fin tip of approximately 19 mm were used. Experiments were conducted at a saturation temperature of 40°C. The fundamental heat transfer characteristics of the low-finned and microscopic-grooved tubes were experimentally investigated to clarify the flow modes of the condensate and the efficacy of the enhanced heat transfer.

Effect of Fin Geometry on Condensation of R407C in a Staggered Bundle of Horizontal Finned Tubes

2003 ◽  
Vol 125 (4) ◽  
pp. 653-660 ◽  
Author(s):  
H. Honda ◽  
N. Takata ◽  
H. Takamatsu ◽  
J. S. Kim ◽  
K. Usami
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Vapor Phase ◽  
Mass Velocity ◽  
Three Dimensional ◽  
Condensation Heat Transfer ◽  
Finned Tubes ◽  
Fin Tubes ◽  
Condensation Heat Transfer Coefficient

Experimental results are presented that show the effect of fin geometry on condensation of downward flowing zeotropic refrigerant mixture R407C in a staggered bundle of horizontal finned tubes. Two types of conventional low-fin tubes and three types of three-dimensional-fin tubes were tested. The refrigerant mass velocity ranged from 4 to 23 kg/m2 s and the condensation temperature difference from 3 to 12 K. The measured condensation heat transfer coefficient was lower than the previous results for R134a, with the difference being more significant for smaller mass velocity. The effect of fin geometry on the condensation heat transfer coefficient was less significant for R407C than for R134a. The effect of condensate inundation was more significant for the three-dimensional-fin tubes than for the low-fin tubes. By using the dimensionless heat transfer correlation for the condensate film that was based on the experimental data for R134a, a superficial vapor-phase heat transfer coefficient was obtained for condensation of R407C. The vapor-phase heat transfer coefficient showed characteristics similar to the vapor-phase mass transfer coefficient that was obtained in the previous study for R123/R134a.

Condensation heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tape inserts

2020 ◽  
Vol 118 ◽  
pp. 31-40 ◽  
Author(s):  
Hadi Ahmadi Moghaddam ◽  
Alireza Sarmadian ◽  
Amirmasoud Asnaashari ◽  
Hossein Ahmadi Nejad Joushani ◽  
Mohammad Saidul Islam ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Condensation Heat Transfer ◽  
Twisted Tape
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