Quick and accurate analysis of cooling tower performance, outlet conditions of moist air, and parameter profiles along the tower height is very important in rating and design calculations. This paper developed an analytical model for the coupled heat and mass transfer processes in counterflow cooling towers based on operating conditions more realistic than most conventionally adopted Merkel approximations. In modeling, values of the Lewis factor were not necessarily specified as unity. Effects of water loss by evaporation and water film heat transfer resistance were also considered in the model equations. Within a relatively narrow range of operating conditions, the humidity ratio of air in equilibrium with the water surface was assumed to be a linear function of the surface temperature. The differential equations were rearranged and an analytical solution was developed for newly defined parameters. The analytical model predicts the tower performances, outlet conditions, and parameter profiles quickly and accurately when comparing with the numerical integration of the original differential equations.
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November 2006
This article was originally published in
Journal of Heat Transfer
Research Papers
An Analytical Approach to the Heat and Mass Transfer Processes in Counterflow Cooling Towers
Chengqin Ren
Chengqin Ren
College of Mechanical and Automotive Engineering,
e-mail: renchengqin@163.com
Hunan University
, Changsha, 410082, China
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Chengqin Ren
College of Mechanical and Automotive Engineering,
Hunan University
, Changsha, 410082, Chinae-mail: renchengqin@163.com
J. Heat Transfer. Nov 2006, 128(11): 1142-1148 (7 pages)
Published Online: May 9, 2006
Article history
Received:
May 6, 2005
Revised:
May 9, 2006
Citation
Ren, C. (May 9, 2006). "An Analytical Approach to the Heat and Mass Transfer Processes in Counterflow Cooling Towers." ASME. J. Heat Transfer. November 2006; 128(11): 1142–1148. https://doi.org/10.1115/1.2352780
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