Heat transfer Characteristics of Fin-and-Tube heat Exchanger under Condensing Conditions
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.
[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.
[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.
@article{"International Journal of Engineering, Mathematical and Physical Sciences:53125", author = "Abdenour Bourabaa and Mohamed Saighi and Said El Metenani", title = "Heat transfer Characteristics of Fin-and-Tube heat Exchanger under Condensing Conditions", abstract = "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.", volume = "6", number = "4", pages = "406-4", }