Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30054
Heat transfer Characteristics of Fin-and-Tube heat Exchanger under Condensing Conditions

Authors: Abdenour Bourabaa, Mohamed Saighi, Said El Metenani


In the present work an investigation of the effects of the air frontal velocity, relative humidity and dry air temperature on the heat transfer characteristics of plain finned tube evaporator has been conducted. Using an appropriate correlation for the air side heat transfer coefficient the temperature distribution along the fin surface was calculated using a dimensionless temperature distribution. For a constant relative humidity and bulb temperature, it is found that the temperature distribution decreases with increasing air frontal velocity. Apparently, it is attributed to the condensate water film flowing over the fin surface. When dry air temperature and face velocity are being kept constant, the temperature distribution decreases with the increase of inlet relative humidity. An increase in the inlet relative humidity is accompanied by a higher amount of moisture on the fin surface. This results in a higher amount of latent heat transfer which involves higher fin surface temperature. For the influence of dry air temperature, the results here show an increase in the dimensionless temperature parameter with a decrease in bulb temperature. Increasing bulb temperature leads to higher amount of sensible and latent heat transfer when other conditions remain constant.

Keywords: Fin efficiency, heat and mass transfer, dehumidifying conditions, finned tube heat exchangers.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF


[1] A.H. Elmahdy, and R.C. Biggs, "Efficiency of extended surfaces with simultaneous heat and mass transfer," ASHRAE Transaction. vol. 89, Part 1A, pp. 135-143, 1983.
[2] Satish G. Kandlikar , "Thermal design theory for compact evaporators" Visiting Scientist, 1988-1990, Mechanical Engineering Department,, Massachusetts Institute of Technology, Cambridge, Mass. 02139.
[3] Mostafa H. Sharqawy, and Seyed M. Zubair, "Efficiency and optimization of an annular fin with combined heat and mass transfer-An analytical solution," International Journal of Refrigeration 30 (2007) 751-757.
[4] Mostafa H. Sharqawy, and Seyed M. Zubair, "Efficiency and optimization of straight fins with combined heat and mass transfer-An analytical solution," Applied Thermal Engineering28 (2008) 2279- 2288.
[5] H. Kazeminejad, "Analysis of one-dimensional fin assembly heat transfer with dehumidification," Int. J. Heat and Mass Transfer. Vol. 38, No. 3, pp. 455-462, 1995.
[6] M. M. Salah El Din, "Performance analysis of partially wet fin assembly," Applied Thermal Engineering Vol. 18, No. 5, pp. 337-349, 1998.
[7] Faye C. McQuiston and Jerald D. Parker, " Heating, Ventilating, and Air Conditioning: Analysis and Design" Second Edition, New York, 1982.
[8] C. Oliet, C.D. Pérez-Segarra, S. Danov and A. Oliva, "Numerical simulation of dehumidifying fin-and-tube heat exchangers: Semianalytical modelling and experimental comparison," International Journal of Refrigeration 30 (2007) 1266-1277.
[9] C. C. Wang, Y. T. Lin and C. J. Lee, "An airside correlation for plain fin-and-tube heat exchangers in wet conditions", International Journal of Heat and Mass Transfer 43, 2000, pp. 1869-1872.