年間 8 号発行
ISSN 印刷: 1065-5131
ISSN オンライン: 1563-5074
Indexed in
Heat Transfer During Film Condensation of R-123 Vapour on Horizontal Integral-Fin Tubes
要約
This paper deals with an experimental study of heat transfer during condensation of R-123 vapour on horizontal integral-fin (HIF) tubes. R-123 is a substitute for R-l 1, which is required to be phased out. The effect of a number of important geometrical parameters like the fin spacing, fin height, and fin shape has been investigated. Data have also been obtained by condensing R-l 1 vapour on some of the tubes, thereby facilitating a direct comparison. For R-123 condensation, the best performance was obtained with a tube with fin base spacing, fin height and fin tip thickness of 0.33, 1.29 and 0.14mm respectively. This tube yielded an enhancement ratio of around 9 at ΔT of 4K. Further, the results indicate that the performance of the tubes yielding high heat flux values is sensitive to the shape of the fin profile, particularly at small fin dimensions. The tests conducted with R-l1 yield a 10 to 15% better performance compared to R-123.
This paper also deals with the development of a generalized correlation to determine the heat transfer performance of HIF tubes. The present experimental data as well as extensive data obtained by earlier investigators for other fluids were made use of in developing the correlation. The correlation predicts the heat transfer performance of all the fluids well and of refrigerants like R-123 and R-11 very well.
-
Gstoehl D., Thome J. R., Film Condensation of R-134a on Tube Arrays With Plain and Enhanced Surfaces: Part II—Empirical Prediction of Inundation Effects, Journal of Heat Transfer, 128, 1, 2006. Crossref
-
Gstoehl D., Thome J. R., Film Condensation of R-134a on Tube Arrays With Plain and Enhanced Surfaces: Part I—Experimental Heat Transfer Coefficients, Journal of Heat Transfer, 128, 1, 2006. Crossref
-
Belghazi M. , Bontemps A. , Marvillet C. , Condensation Heat Transfer on Enhanced Surface Tubes: Experimental Results and Predictive Theory , Journal of Heat Transfer, 124, 4, 2002. Crossref
-
Cavallini A., Censi G., Del Col D., Doretti L., Longo G.A., Rossetto L., Zilio C., Condensation inside and outside smooth and enhanced tubes — a review of recent research, International Journal of Refrigeration, 26, 4, 2003. Crossref
-
Eckert E.R.G., Goldstein R.J., Ibele W.E., Simon T.W., Kuehn T.H., Strykowski P.J., Tamma K.K., Bar-Cohen A., Heberlein J.V.R., Davidson J.H., Bischof J., Kulacki F., Kortshagen U., Heat transfer — a review of 1996 literature, International Journal of Heat and Mass Transfer, 43, 8, 2000. Crossref
-
Kim Nae-Hyun, Condensation of R-134a on Horizontal Enhanced Tubes Having Three-Dimensional Roughness, International Journal of Air-Conditioning and Refrigeration, 24, 02, 2016. Crossref
-
Christians Marcel, Habert Mathieu, Thome John R., Film Condensation of R-134a and R-236fa, Part 1: Experimental Results and Predictive Correlation for Single-Row Condensation on Enhanced Tubes, Heat Transfer Engineering, 31, 10, 2010. Crossref
-
Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Condensation, in Two-Phase Heat Transfer Enhancement, 2020. Crossref
-
Heat Transfer During Condensation, in Two‐Phase Heat Transfer, 2021. Crossref