Abstract

An experimental investigation of shell-side flow condensation was performed on three-dimensional surface enhanced tubes, including a herringbone micro-fin tube and a newly developed 1-EHT tube. An equivalent plain tube was also tested for performance comparison. All the test tubes had similar geometry parameters, i.e., inner diameter 11.43 mm and outer diameter 12.7 mm. The outer shell diameter was 24.5 mm with a wall thickness of 0.6 mm. Tests were conducted using R410A as the working fluid at a dew point of 45 °C. The mass flux range of 10–55 kg/(m2 · s) with an inlet quality of 0.8 and an outlet quality of 0.1. Experimental results showed that the plain tube exhibited a better condensation heat transfer performance. Moreover, the mass flux had a significant influence on the heat transfer coefficient for shell-side condensation. A new prediction model based on the Cavallini’s equation was developed to predict the condensing coefficient where the mean absolute error is less than 4%.

References

1.
Guo
,
S. P.
,
Wu
,
Z.
,
Li
,
W.
,
Kukulka
,
D.
,
Sundén
,
B.
,
Zhou
,
X. P.
,
Wei
,
J. J.
, and
Simon
,
T.
,
2015
, “
Condensation and Evaporation Heat Transfer Characteristics in Horizontal Smooth, Herryingbone and Enhanced Surface EHT Tubes
,”
Int. J. Heat Mass Transfer
,
85
(
1
), pp.
281
291
.
2.
Cavallini
,
A.
,
Censi
,
G.
,
Del Col
,
D.
,
Doretti
,
L.
,
Longo
,
G. A.
, and
Rossetto
,
L.
,
2001
, “
Experimental Investigation on Condensation Heat Transfer and Pressure Drop of New HFC Refrigerants (R134a, R125, R32, R410A, R236ea) in a Horizontal Tube
,”
Int. J. Refrig.
,
24
(
1
), pp.
73
87
.
3.
Dobson
,
M. K.
, and
Chato
,
J. C.
,
1998
, “
Condensation in Smooth Horizontal Tubes
,”
ASME J. Heat Transfer
,
120
(
1
), pp.
193
213
.
4.
Cavallini
,
A.
,
Censi
,
G.
,
Del Col
,
D.
,
Doretti
,
L.
,
Longo
,
G. A.
, and
Rossetto
,
L.
,
2002
, “
Condensation of Halogenated Refrigerants Inside Smooth Tubes
,”
HVAC&R Res.
,
8
(
4
), pp.
429
451
.
5.
Nozu
,
S.
, and
Honda
,
H.
,
2000
, “
Condensation of Refrigerants in Horizontal, Spirally Grooved Microfin Tubes: Numerical Analysis of Heat Transfer in Annular Flow Regime
,”
ASME J. Heat Transfer
,
122
(
1
), pp.
80
90
.
6.
Miyara
,
A.
,
Nonaka
,
K.
, and
Taniguchi
,
M.
,
2000
, “
Condensation Heat Transfer and Flow Pattern Inside a Herringbone-Type Micro-Fin Tube
,”
Int. J. Refrig.
,
23
(
2
), pp.
141
152
.
7.
Karkhu
,
V. A.
, and
Borovkov
,
V. P.
,
1971
, “
Film Condensation of Vapour at Finely-Finned Horizontal Tubes
,”
Heat Transfer Sov. Res.
,
3
(
1
), pp.
183
191
.
8.
Webb
,
R. L.
,
Rudy
,
T. M.
, and
Kedzierski
,
M. A.
,
1985
, “
Prediction of the Condensation Coefficient on Horizontal Integral-Fin Tube
,”
ASME J. Heat Transfer
,
107
(
2
), pp.
369
376
.
9.
Honda
,
H.
, and
Nozu
,
S.
,
1987
, “
A Prediction Method for Heat Transfer During Film Condensation on Horizontal Low Integral-Fin Tubes
,”
ASME J. Heat Transfer
,
109
(
1
), pp.
218
225
.
10.
Rose
,
J. W.
,
1994
, “
An Approximate Equation for the Vapour-Side Heat Transfer Coefficient for Condensation on Low-Finned Tubes
,”
Int. J. Heat Mass Transfer
,
37
(
5
), pp.
865
875
.
11.
Briggs
,
A.
, and
Rose
,
J. W.
,
1994
, “
Effect of Fin Efficiency on a Model for Condensation Heat Transfer on a Horizontal Integral-Fin Tube
,”
Int. J. Heat Mass Transfer
,
37
(
1
), pp.
457
463
.
12.
Wu
,
Z.
,
Wu
,
Y.
,
Sundén
,
B.
, and
Li
,
W.
,
2013
, “
Convective Vaporization in Micro-Fin Tubes of Different Geometries
,”
Exp. Therm. Fluid. Sci.
,
44
(
1
), pp.
398
408
.
13.
Petukhov
,
B. S.
, and
Popov
,
V. N.
,
1963
, “
Theoretical Calculation of Heat Exchange and Frictional Resistance in Turbulent Flow in Tubes of an Incompressible Fluid With Variable Physical Properties
,”
High Temp.
,
6
(
1
), pp.
69
83
.
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