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TECHNICAL PAPERS: Heat Exchangers

An Improved Design and Rating Analyses of Counter Flow Wet Cooling Towers

[+] Author and Article Information
Jameel-ur-Rehman Khan, Syed M. Zubair

Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

J. Heat Transfer 123(4), 770-778 (Jan 20, 2001) (9 pages) doi:10.1115/1.1376395 History: Received January 11, 2000; Revised January 20, 2001
Copyright © 2001 by ASME
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References

Figures

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Schematic of a wet counter flow cooling tower
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Mass and energy balance of a wet counter flow cooling tower
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Water operating line on enthalpy-temperature diagram indicating the effect of tie line (E=−hc,w/hD) on saturated moist air enthalpy
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Comparisons of NTU with slope of tie line E=−hc,w/hD for different values of Lewis number Le
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Comparisons of effectiveness ε with temperature ratio R by varying the water-outlet temperature tw,o for different values of mass-flow rate ratios. Slope of the tie line E=11.1 (Fig. 5(a)), and E=∞ (Fig. 5(b)).
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Comparisons of effectiveness ε with temperature ratio R by varying water-outlet temperature tw,o (Fig. 6(a)), and air approach temperature (tw,i−twb,o) with R (Fig. 6(b)).
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Comparisons of NTU with temperature ratio R by varying water-outlet temperature tw,o
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Variations of maximum mass-flow rate ratio with temperature ratio R by varying the water-outlet temperature tw,o
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Comparisons of effectiveness ε with temperature ratio R by varying air inlet wet-bulb temperature twb,i (Fig. 9(a)), and air approach temperature (tw,i−twb,o) with R (Fig. 9(b))
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Comparisons of NTU with temperature ratio R by varying air inlet wet-bulb temperature tw,b,i
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Variations of maximum mass-flow rate ratio with temperature ratio R by varying the air inlet wet-bulb temperature twb,i
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Comparisons of effectiveness ε with inlet air wet bulb temperature twb,i (Fig. 12(a)), and air approach temperature (tw,i−twb,o) with R (Fig. 12(b))
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Comparisons of water outlet temperature tw,o with inlet air wet bulb temperature twb,i
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Comparisons of effectiveness ε with water inlet temperature tw,i (Fig. 14(a)), and water outlet temperature tw,o with tw,i (Fig. 14(b)).
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Comparisons of effectiveness ε with inlet air dry bulb temperature tdb,i (Fig. 15(a)), and water outlet temperature tw,o with tdb,i (Fig. 15(b))

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