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RESEARCH PAPER

The Condensation of Ammonia-Water Mixtures in a Horizontal Shell and Tube Condenser

[+] Author and Article Information
Chris Philpott, Joe Deans

Department of Mechanical Engineering, University of Auckland, New Zealand

J. Heat Transfer 126(4), 527-534 (May 24, 2004) (8 pages) doi:10.1115/1.1778188 History: Received June 02, 2003; Revised May 24, 2004
Copyright © 2004 by ASME
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References

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Domingo, N, Chen, F. C., and Murphy, R. W., 1992, “Ammonia Water Mixture Experiments,” internal report, Oak Ridge National Laboratory, TN.
Morrison,  J. N. A., and Deans,  J., 1997, “Augmentation of Steam Condensation Heat Transfer by Addition of Ammonia,” Int. J. Heat Mass Transfer, 40, pp. 765–772.
Panchal,  C. B., Kuru,  W., Chen,  F., Domingo,  N., and Huang Fu,  E., 1997, “Experimental and Analytical Studies of Condensation of Ammonia Water Mixtures,” AIChE Symp. Ser., 93, pp. 239–244.
Morrison, J. N. A., 1996, “The Condensation of Ammonia-Water Vapours on a Horizontal Tube,” Ph.D. thesis, The University of Auckland, New Zealand.
Morrison,  J. N. A., Philpott,  C., and Deans,  J., 1998, “Augmentation of Steam Condensation Heat Transfer by Addition of Methylamine,” Int. J. Heat Mass Transfer, 41, pp. 3679–3683.
Deans, J., Korte, C., and Dunstall, M., 2001, “The Comparison of Steam Condensation Rates When There are Low Concentrations of Ammonia, Methylamine and Trimethylamine in Vapor,” Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 2001 Conference, Pisa.
Philpott, C., 2003, “The Condensation of Ammonia-Water Mixtures in a Horizontal Shell and Tube Condenser,” Ph.D. thesis, The University of Auckland, Auckland, New Zealand.
Colburn,  A. P., and Drew,  T. B., 1937, “The Condensation of Mixed Vapors,” Trans. AIChE,33, pp. 197–212.
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Memory,  S. B., and Rose,  J. W., 1991, “Free Convection Laminar Film Condensation on a Horizontal Tube With Variable Wall Temperature,” Int. J. Heat Mass Transfer, 34, pp. 2775–2778.
Fujii,  T., 1992, “Overlooked Factors and Unsolved Problems in Experimental Research on Condensation Heat Transfer,” Exp. Therm. Fluid Sci., 5, pp. 652–663.
Philpott,  C., and Deans,  J., 2004, “The Enhancement of Steam Condensation Heat Transfer in a Horizontal Shell and Tube Condenser by Addition of Ammonia,” Int. J. Heat Mass Transfer, 47, pp. 3686–3693.
Wang,  K. H., Ludviksson,  V., and Lightfoot,  E. N., 1971, “Hydrodynamic Stability of Marangoni Films: II. A Preliminary Analysis of the Effect of Interphase Mass Transfer,” AIChE J., 17, pp. 1402–1408.
Ludviksson,  V., and Lightfoot,  E. N., 1968, “Hydrodynamic Stability of Marangoni Films,” AIChE J., 14, pp. 620–626.
Korte, C., Dunstall, M. G., and Deans, J., 1999, “Onset of the Marangoni Effect During Condensation of Ammonia-Water Mixtures,” Two-Phase Flow Modelling and Experimentation Conference, Pisa, pp. 405–410.
Korte, C., Deans, J., and Dunstall, M. G., 2000, “Onset of the Marangoni Effect During Condensation of Ammonia-Water Mixtures—Effect of Temperature Driving Force Variation,” 3rd European Thermal Sciences Conference, Heidelberg, pp. 905–910.

Figures

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Schematic of ammonia-water test condenser
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Condensation heat transfer coefficient at various tube heat loads. (Inset shows experimental results relative to Nusselt analysis (Eq. 3).)
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Condenser bulk vapor ammonia concentration. (Note the Trend lines were derived from the numerical model and that they are depicted as a continuous line for clarity.)
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Variation in tube wall temperature profile with ammonia concentration. (The wall temperature around the circumference of the tube has been normalized about the 180 deg tube wall temperature, i.e., Tw,θ−Tw,θ=180, to illustrate the tube wall temperature profile at various ammonia concentrations more clearly.)
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Sectional condensation heat transfer coefficients
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Ratio of sectional condensation heat transfer coefficient to Nusselt’s prediction
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Average tube condensation heat transfer coefficient
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Ratio of overall condensation heat transfer coefficient to Nusselt’s prediction
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Condenser pressure variation with inlet vapor ammonia concentration
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Vapor and condensate film resistances
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(a–l) The condensate film at various vapor ammonia concentrations and positions within the condenser (left=section 6, middle=section 4, right=section 2)

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