The heat transfer rates that develop when ammonia water mixtures condense within a small, un-vented, horizontal, shell and tube condenser are examined. The vapor flow within the condenser was constrained by baffles and the condensate created formed a pool that flowed along the base of the condenser. During the test program the inlet ammonia vapor concentration to the condenser varied from 0 to 10 wt % and the maximum local vapor concentration measured was 26 wt %. The experimental results demonstrate that the condensation heat transfer rates generally decrease with increasing ammonia concentration, however at low ammonia concentrations (<2 wt %) the local and overall heat transfer rates for the condenser were enhanced. When the ammonia concentration was 0.9 wt %, the vapor heat transfer rate was 34 percent greater than that predicted by the Nusselt analysis for steam at the same conditions. This enhancement is attributed to the disturbed morphology of the condensate film, created by Marangoni instabilities.

1.
Kalina
,
A. I.
,
1984
, “
Combined Cycle With Novel Bottoming Cycle
,”
ASME J. Eng. Gas Turbines Power
,
106
, pp.
737
742
.
2.
Domingo, N, Chen, F. C., and Murphy, R. W., 1992, “Ammonia Water Mixture Experiments,” internal report, Oak Ridge National Laboratory, TN.
3.
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
.
4.
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
.
5.
Morrison, J. N. A., 1996, “The Condensation of Ammonia-Water Vapours on a Horizontal Tube,” Ph.D. thesis, The University of Auckland, New Zealand.
6.
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
.
7.
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.
8.
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.
9.
Colburn
,
A. P.
, and
Drew
,
T. B.
,
1937
, “
The Condensation of Mixed Vapors
,”
Trans. AIChE
,
33
, pp.
197
212
.
10.
Tillner-Roth
,
R.
, and
Friend
,
D. G.
,
1998
,
J. Phys. Chem. Ref. Data
,
27
, pp.
63
96
.
11.
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
.
12.
Fujii
,
T.
,
1992
, “
Overlooked Factors and Unsolved Problems in Experimental Research on Condensation Heat Transfer
,”
Exp. Therm. Fluid Sci.
,
5
, pp.
652
663
.
13.
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
.
14.
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
.
15.
Ludviksson
,
V.
, and
Lightfoot
,
E. N.
,
1968
, “
Hydrodynamic Stability of Marangoni Films
,”
AIChE J.
,
14
, pp.
620
626
.
16.
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.
17.
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.
You do not currently have access to this content.