A general exergy balance equation that is applicable to any component of thermal systems has been formulated in this study. One of distinct features of this formulation is that the exergy involved in the component of any thermal system can be decomposed into exergy flows, entropy production flows, and the appropriate exergy rate terms such as fuel and available work. The exergy analysis based on this equation permits one to predict the thermal efficiency of the system, the exergy destruction in each component as well as the mass flow rate, the composition, and the temperature of the exhaust gases. We have examined the performance of a 1000 kW gas turbine cogeneration system when it is operated at part and full-load conditions through this analysis. We have also tested the effect of the inlet air temperature and the relative humidity of the inlet air on the performance of the system. The predicted values of the performances for the system have been compared with the actual performance data provided by the gas turbine manufacturer. It has been found that the measured data of net power and the properties of exhaust gases are in good agreement with calculation ones, differing by less than 3 percent. The exergy balance equation may be utilized in the exergoeconomic analysis to estimate the production costs depending on various input costs in a gas turbine cogeneration system.

Issue Section:
Gas Turbines: Industrial and Cogeneration
Topics:
Combined heat and power, Exergy analysis, Gas turbines, Exergy, Flow (Dynamics), Exhaust systems, Gases, Temperature, Thermal systems, Entropy, Fuels, Stress, Thermal efficiency
1.
Baughn
J. W.
, and
Bagheri
N.
,
1987
, “
The Effect of Thermal Matching on the Thermodynamic Performance of Gas Turbine and IC Engine Cogeneration System
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
109
, pp.
39
–
45
.
2.
Baughn
J. W.
, and
Kerwin
R. A.
,
1987
, “
Comparison of the Predicted and Measured Thermodynamic Performance of a Gas Turbine Cogeneration System
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
109
, pp.
32
–
38
.
3.
Bejan, A., 1988, Advanced Engineering Thermodynamics, Wiley, New York.
4.
Chapra, S. C., and Canale, R. P., 1988, Numerical Methods for Engineers, McGraw-Hill, New York.
5.
Dunbar, W. R., Mood, S. D., and Lior, N., 1993, “Exergy Analysis of the Lasalle Country Nuclear Power Station,” Thermodynamics and the Design, Analysis and Improvement of Energy Systems, H. J. Richter, ed., ASME HTD-Vol. 266, pp. 377–387.
6.
El-Masri
M. A.
,
1985
, “
On Thermodynamics of Gas-Turbine Cycle: Part 1—Second Law Analysis of Combined Cycles
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
107
, pp.
880
–
889
.
7.
Gordon, S., and McBride, B., 1971, “Computer Program for Calculation of Complex Chemical Equilibrium Compositions, Rocket Performance, Incident and Reflected Shocks and Chapman-Jouguet Detonations,” NASA SP-273.
8.
Heywood, J. R., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, New York.
9.
Howell, J. R., 1987, Fundamentals of Engineering Thermodynamics, McGraw-Hill, New York.
10.
JANAF Thermochemical Tables, 1971, National Bureau of Standard Publications, NSRDS-N3537, Washington, DC.
11.
JSME Steam Tables, 1968, JSME.
12.
Kim, S., 1995, “Study on Exergy, Exergoeconomic and Optimization Analysis and Operational Strategy for a Gas Turbine Cogeneration Systems,” Master’s Thesis, Chung-Ang University, Seoul, Korea.
13.
Kim, S., Oh, S. D., and Kwak, H. Y., 1995, “A New Approach of Exergoeconomic Analysis of Thermal Systems,” Proc. KSME Spring Annual Meeting, pp. 504–510.
14.
Kwon, Y. H., Park, S. H., Cha, J. H., Oh, S. D., Kim, C. T., Han, D. H., Kim, S., W., Sohn, W. S., Pang, H. S., Kim, S. M., Kim, T. K., and Kwak, H. Y., 1995, “Research and Development of 1000 kW Class Packaged Type Gas Turbine Cogeneration System,” Proc. KSME Thermal & Fluids Engineering Division, pp. 34–41.
15.
Lundberg
M.
,
1991
, “
Latent Heat Utilization in Steam-Injected Gas Turbine Application
,”
Proc. ASME COGEN-TURBO
, IGTI-Vol.
6
, pp.
9
–
18
.
16.
Moran, M. J., 1982, Availability Analysis, Prentice-Hall, New York.
17.
Phillips, J. N., 1986, “A Study of Off-Design Performance of Integrated Coal Gasification Combined-Cycle Power Plant,” Ph.D. Dissertation, Stanford University, CA.
18.
Stoecker, W. F., 1989, Design of Thermal Systems, McGraw-Hill, New York.
This content is only available via PDF.
Copyright © 1996
 by The American Society of Mechanical Engineers
You do not currently have access to this content.