Advanced SearchSearch Tips
Analysis of Heat and Mass Transfer in an Evaporative Cooler with Fully Wetted Channel
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Analysis of Heat and Mass Transfer in an Evaporative Cooler with Fully Wetted Channel
Song, Chan-Ho; Lee, Dae-Yeong; No, Seung-Tak;
  PDF(new window)
A theoretical analysis on the heat and mass transfer in an evaporative cooler is presented in this work. The evaporative cooler is modeled as a channel filled with porous media the interstitial surface of which is covered by thin water film. Assuming that the Lewis number is unity and the water vapor saturation curve is linear, exact solutions to the energy and vapor concentration equations are obtained. Based on the exact solutions, the characteristics of the heat and mass transfer in the evaporative cooler are investigated. The comparison of the cooling performance between the evaporative cooler and the usual sensible heat exchanger is also carried out. Obviously, the evaporative heat exchanger shows better cooling performance than the sensible heat exchanger. This is due to the latent heat of water vaporization, which results in apparent increases both in the interstitial heat transfer coefficient and the specific heat of the air stream in the evaporative cooler.
Evaporative Cooler;Porous Media;Lewis Number;Wet Bulb Temperature;Water Film;
 Cited by
Yang, W.-J. and Clark, D. W., 1975, 'Spray Cooling of Air-Cooled Compact Heat Exchangers,' Int. J. Heat Mass Transfer, Vol. 18, pp. 311-317 crossref(new window)

Perez-Blanco, H. and Bird, W. A., 1984, 'Study of Heat and Mass Transfer in a Vertical-Tube Evaporative Cooler', ASME, J. Heat Transfer, Vol. 106, pp. 210-215

Graham, K. M., Ramadhyani, S., 1996, 'Experimental and Theoretical Studies of Mist Jet Impingement Cooling,' ASME, J. Heat Transfer, Vol. 118, pp. 343-349

Chuntranuluck, S., Wells, C. M., and Cleland, A. C., 1998, 'Prediction of Chilling Times of Foods in Situations Where Evaporative Cooling is Significant-Part 2. Experimental Testing,' Journal of Food Engineering, Vol. 37, pp. 127-141 crossref(new window)

Sweetland, M., Lienhard V, J. H., 2000, 'Evaporative Cooling of Continuously Drawn Glass Fibers by Water Sprays,' Int. J. Heat and Mass Transfer, Vol. 43, pp. 777-790 crossref(new window)

Brown, W. K., 1996, 'Application of Evaporative Cooling to Large HVAC Systems,' ASHRAE Transaction, pp. 895-907, Part I

Watt, J. R. and Brown, W. K., 1997, Evaporative Air Conditioning Handbook, 3rd ed, Fairmont Press

Dhar, P. L., Kaushik, S. C., Jain, S., Pahwa, D., Kumar, R., 1995, 'Thermodynamic Analysis of Desiccant-Augmented Evaporative Cooling Cycles for Indian Conditions,' ASHRAE Transaction, pp. 735-749, Part I

Maclaine-cross, I. L. and Banks, P. J., 1981, 'A General Theory of Wet Surface Heat Exchangers and its Application to Regenerative Evaporative Cooling,' ASME J. Heat Transfer, Vol. 103, pp. 579-585

Kettleborough, C. F. and Hsieh, C. S., 1983, 'The Thermal Performance of the Wet Surface Plastic Plate Heat Exchanger Used as an Indirect Evaporative Cooler,' ASME J. Heat Transfer, Vol. 105, pp. 366-373

Hsu, S. T., Lavan, Z., and Worek, W. M., 1989, 'Optimization of Wet-Surface Heat Exchangers,' Energy, Vol. 14, No. 11, pp. 757-770 crossref(new window)

Chen, P. L., Qin, H. M., Huang, Y. J., and Wu, H. E, 1991, 'A Heat and Mass Transfer Model for Thermal and Hydraulic Calculations of Indirect Evaporative Cooler Performance,' ASHRAE Transaction, pp. 852-865

Stoitchkov, N. J. and Dimitrov, G. I., 1998, 'Effectiveness of Crossflow Plate Heat Exchanger for Indirect Evaporative Cooling,' Int. J. Refrig., Vol. 21., No.6, pp. 463-471 crossref(new window)

Tsay, Y. L., 1994, 'Analysis of Heat and Mass Transfer in a Countercurrent-flow Wet Surface Heat Exchanger,' Int. J. Heat and Fluid Flow, Vol. 15, No. 2, pp. 149-156 crossref(new window)

Yan, W.-M., 1995, 'Effect of Film Vaporization on Turbulent Mixed Convection Heat and Mass Transfer in a Vertical Channel,' Int. J. Heat Mass Transfer, Vol. 38, No.4, pp. 713-722 crossref(new window)

Yan, W.-M., 1998, 'Evaporative Cooling of Liquid Film in Turbulent Mixed Convective Channel Flows,' Int. J. Heat Mass Transfer, Vol. 41, pp. 3719-3729 crossref(new window)

Kim, S. J., Kim, D., 1999, 'Forced Convection in Microstructures for Electronic Equipment Cooling,' ASME J. Heat Transfer, Vol. 121. pp. 639-645

Lee, D. - Y. and Vafai, K., 1999, 'Analytical Characterization and Conceptual Assessment of Solid and Fluid Temperature Differentials in Porous Media,' Int. J. Heat and Mass Transfer, Vol. 42, pp. 423-435 crossref(new window)


Kays, W. M. and Crawford, M. E., 1993, Convective Heat and Mass Transfer, 3rd ed., Chap. 4, McGraw-Hill, Inc