Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

Volume 27, 2020 Volume 26, 2019 Volume 25, 2018 Volume 24, 2017 Volume 23, 2016 Volume 22, 2015 Volume 21, 2014 Volume 20, 2013 Volume 19, 2012 Volume 18, 2011 Volume 17, 2010 Volume 16, 2009 Volume 15, 2008 Volume 14, 2007 Volume 13, 2006 Volume 12, 2005 Volume 11, 2004 Volume 10, 2003 Volume 9, 2002 Volume 8, 2001 Volume 7, 2000 Volume 6, 1999 Volume 5, 1998 Volume 4, 1997 Volume 3, 1996 Volume 2, 1995 Volume 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i2.30
pages 97-107

Enhanced Effect of a Horizontal Micro-fin Tube for Condensation Heat Transfer with R22 and R410A

Jeong-Tae Kwon
Department of Mechanical Engineering, Hoseo University, Asan, Korea
Su Ki Park
Korea Electric Power Research Institute, Moonji-dong 103-16, Yousoung-gu, Taejon, 305-380, Korea
Moo Hwan Kim
Division of Advanced Nuclear Engineering, POSTECH, Pohang, Gyeongbuk 37673, Republic of Korea; Department of Mechanical Engineering, POSTECH, Pohang, Gyeongbuk 37673, Republic of Korea


This study presents the local heat transfer characteristics of R410A, a potential candidate for replacing R22, condensing in a horizontal smooth and a micro-fin tube. For a comparison, the R22 condensation heat transfer data are also shown.
The test sections of the present experimental apparatus consist of 7 counter-flow heat exchanger type units. The refrigerant flows in a horizontal copper tube and the cooling water flows through the annular space outside of the tube. The in-tube condensation heat transfer coefficients were obtained from the measured overall heat transfer coefficient of each test unit and the annulus-side heat transfer coefficient. The annulus-side heat transfer coefficients were determined from the correlation developed using a modified Wilson plot technique in this study.
The experiment has been conducted with the refrigerant mass flux ranging from 97 to 202 kg/ms. The condensation heat transfer coefficient of R410A in the smooth tube were compared to some existing correlations frequently referred to in open literature. The present data confirmed the applicability of the correlations to this alternative refrigerant for condensation heat transfer in smooth tubes. The enhancement ratio of the micro-fin tube ranged from 1.5 to 2.2 based on the nominal heat transfer area. It becomes higher with decreasing mass flux and increasing quality for both R22 and R410A.