The exergy (second-law) efficiency is formulated for a condensation process in a shell and one-path tube exchanger for a fixed control volume. The exergy efficiency ηex is expressed as a function of the inlet and outlet temperatures and mass flow rates of the streams. This analysis is utilized to assess the trend of local exergy efficiency along the condensation path and evaluate its value for the entire condenser, i.e., overall exergy efficiency. The numerical results for an industrial condenser, with a steam-air mixture and cooling water as working fluids, indicate that ηex is significantly affected by the inlet cooling water and environment temperatures. Further investigation shows that other performance parameters, such as the upstream mixture temperature, air mass flow rate, and ratio of cooling water mass flow rate to upstream steam mass flow rate, do not have considerable effects on ηex. The investigations involve a dimensionless ratio of the temperature difference of the cooling water and environment to the temperature difference of condensation and the environment. Numerical results for various operational conditions enable us to accurately correlate both the local and overall exergy efficiency as linear functions of dimensionless temperature.

1.
Dincer
,
I.
, 2002, “
The Role of Exergy in Energy Policy Making
,”
Energy Policy
0301-4215,
30
, pp.
137
149
.
2.
Akpinar
,
E. K.
, 2006, “
Evaluation of Heat Transfer and Exergy Loss in a Concentric Double Pipe Exchanger Equipped With Helical Wires
,”
Energy Convers. Manage.
0196-8904,
47
, pp.
3473
3486
.
3.
Naphon
,
P.
, 2006, “
Second Law Analysis on the Heat Transfer of the Horizontal Concentric Tube Heat Exchanger
,”
Int. Commun. Heat Mass Transfer
0735-1933,
33
, pp.
1029
1041
.
4.
San
,
J. Y.
, and
Jan
,
C. L.
, 2000, “
Second-Law Analysis of a Wet Crossflow Heat Exchanger
,”
Energy
0360-5442,
25
, pp.
939
955
.
5.
Selbaş
,
R.
,
Kızılkan
,
O.
, and
Şencan
,
A.
, 2006, “
Thermoeconomic Optimization of Subcooled and Superheated Vapor Compression Refrigeration Cycle
,”
Energy
0360-5442,
31
, pp.
1772
1792
.
6.
Accadia
,
M. D.
,
Fichera
,
A.
,
Sasso
,
M.
, and
Vidiri
,
M.
, 2002, “
Determining the Optimal Configuration of a Heat Exchanger (With a Two-Phase Refrigerant) Using Exergoeconomics
,”
Appl. Energy
0306-2619,
71
, pp.
191
203
.
7.
Moran
,
M. J.
, and
Shapiro
,
H. N.
, 2004,
Fundamental of Engineering Thermodynamics
,
5th ed.
,
Wiley
,
Hoboken, NJ.
.
8.
Haseli
,
Y.
, and
Roudaki
,
S. J. M.
, 2004, “
A Calculation Method for Analysis Condensation of a Pure Vapor in the Presence of a Non-Condensable Gas on a Shell and Tube Condenser
,”
Proceedings of the ASME Heat Transfer/Fluids Engineering Summer Conference
, Charlotte, NC, Vol.
3
, pp.
155
163
.
9.
Haseli
,
Y.
, and
Roudaki
,
S. J. M.
, 2003, “
Simultaneous Modeling of Heat and Mass Transfer of Steam-Air Mixture on a Shell and Tube Condenser Based on Film Theory
,”
Proceedings of the ASME Summer Heat Transfer Conference
, Las Vegas, NV, Vol.
2
, pp.
251
259
.
You do not currently have access to this content.